51. A company discovers, during the current year, that an expense was understated in the immediately preceding year, overstating that prior year's profit; because this specific error was self-reversing (counterbalancing), the following year's expense (the current year, before the error was discovered) was correspondingly overstated by the same amount, meaning the CURRENT year's reported profit, taken on its own, happens to already be correct once both years are considered together, even though neither individual year was ever actually corrected. How should the company respond to discovering this error, given that the current year's own figures are, by coincidence, no longer misstated overall?

A) Only the current year's financial statements need to be adjusted, since the prior year's financial statements have already been issued and are therefore permanently unable to be revisited under any circumstances
B) IAS 8 still requires the originally affected prior period to be separately identified and retrospectively restated, correcting that specific period's understated expense (and overstated profit), together with a corresponding restatement of the following (comparative) period's own expense and profit, even though the combined, net effect on the current period's reported profit happens to be nil; each period misstated its own results and must be individually corrected, regardless of whether their combined effect over time happens to cancel out
C) The error is reclassified as a change in accounting estimate rather than a prior period error, specifically because its overall effect across the two years nets to nil
D) No correction of any kind is required, since the current year's reported profit is, taken by itself, already correct once the two self-cancelling years are considered together

Correct: B difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraphs 41-49 (retrospective restatement of prior period errors)

A self-reversing (counterbalancing) error, even where its overall effect across two periods happens to net to nil by the time it is discovered, still means that each of the two individual periods was separately misstated in its own right (one period's profit overstated, the other's understated, or vice versa); IAS 8 requires prior period errors to be corrected by retrospectively restating the comparative amounts for the specific prior period(s) in which the error occurred, not merely assessed based on whether their combined, netted effect on the currently reported period happens to be immaterial or nil. The originally affected prior period must be identified and restated to reflect its own correct expense and profit figures, together with a corresponding restatement of the following comparative period (whose own results were also affected by the same self-reversing mechanism), even though the combined effect nets out by the time of discovery; each period's own individual financial statements were misstated and must be corrected on their own terms. Option D incorrectly focuses only on the combined, netted effect on the currently reported period, ignoring that each individual prior period was separately and genuinely misstated. Option A incorrectly assumes prior year financial statements, once issued, can never be revisited, when IAS 8 specifically requires retrospective restatement of prior period comparatives for a material error, regardless of whether those statements have already been issued. Option C incorrectly reclassifies a genuine mistake (an error) as a change in accounting estimate merely because of its self-cancelling combined effect, when the definitions of these two concepts under IAS 8 turn on their underlying nature (a mistake versus new information), not on whether their effects happen to net out over time.

52. A material prior period error is traced, through investigation, to a deliberate override of the company's own established internal controls by a senior member of management, rather than an innocent mistake made by a junior employee following the correct procedures incorrectly. How does the deliberate, management-level nature of this error affect its accounting correction under IAS 8, and what broader consequence does it also typically raise?

A) Since the error involved deliberate action by management, it cannot be classified as a prior period error under IAS 8 at all, and is instead treated as fraud, a concept entirely outside the scope of financial reporting standards
B) The error requires a fundamentally different accounting correction mechanism than an innocent mistake, applying a more severe measurement basis specifically reserved for deliberate errors
C) The error is corrected under IAS 8 in exactly the same way as any other material prior period error, through retrospective restatement, since IAS 8's definition of an error applies regardless of whether it arose from an innocent mistake or a deliberate act; however, the fact that the error involved a deliberate management override of internal controls also typically raises separate, broader corporate governance and internal control considerations, beyond the accounting correction itself, which may warrant its own disclosure or reporting
D) IAS 8 does not apply to errors arising from deliberate management override at all; such errors are instead addressed exclusively through separate legal or disciplinary proceedings, with no accounting restatement required

Correct: C difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraph 5 (definition of prior period errors) and paragraphs 41-49 (correction)

IAS 8 defines a prior period error broadly, as omissions from, and misstatements in, an entity's financial statements arising from a failure to use, or misuse of, reliable information, without distinguishing based on whether the underlying cause was an innocent mistake or a deliberate act; the accounting correction (retrospective restatement) is the same regardless of the error's underlying cause. However, where a material error is specifically traced to a deliberate override of internal controls by a member of management, rather than an isolated employee-level mistake, this carries significant additional implications beyond the accounting correction itself, since it indicates a potential weakness or failure at the level of the entity's own governance and control environment; this typically warrants separate consideration and, depending on the circumstances and applicable requirements, disclosure or reporting regarding internal control effectiveness and corporate governance, over and above the straightforward IAS 8 restatement of the financial statements themselves. Option D incorrectly removes the error from IAS 8's scope entirely, when IAS 8 applies to material errors regardless of their underlying cause. Option B incorrectly invents a separate, more severe accounting measurement basis specific to deliberate errors, when IAS 8's correction mechanism does not vary based on intent. Option A incorrectly and completely removes deliberate management-level errors from IAS 8's scope, treating fraud as entirely outside financial reporting standards, when a fraudulent misstatement is nonetheless an error requiring correction under IAS 8's broad definition.

53. A company retrospectively restates a material prior period error, which materially reduces the profit and net assets it had originally reported for the prior year. The company separately holds an existing loan agreement containing a financial covenant based on a leverage ratio, calculated using the company's reported figures; based on the ORIGINAL, uncorrected figures as reported at the time, the company appeared to comfortably satisfy this covenant. Once the restated, corrected figures are applied instead, the leverage ratio calculated on the restated basis would actually have breached the covenant threshold at that date. What further consideration does this raise, beyond the accounting restatement itself?

A) The loan agreement itself is automatically declared void and unenforceable the moment any prior period restatement affects a financial covenant calculation
B) The lender is deemed to have automatically waived the covenant breach simply because the original, uncorrected figures did not show a breach at the time they were reported
C) No further consideration arises at all, since a debt covenant is based purely on a contractual definition and is entirely unrelated to how the company's own financial statements are subsequently restated for accounting purposes
D) The company must separately consider whether the restated figures indicate that the debt covenant was, in substance, actually breached at the relevant date, which may have implications for the classification of the related loan (potentially requiring reclassification from non-current to current) and for going concern and disclosure considerations, distinct from, but arising as a consequence of, the accounting restatement itself

Correct: D difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraphs 41-49 (retrospective restatement); IAS 1 Presentation of Financial Statements, paragraphs 74-76 (current/non-current classification following a covenant breach)

While the accounting restatement of the prior period error is addressed under IAS 8 in the ordinary way, a separate and important further consideration arises where the restated figures reveal that a debt covenant, calculated by reference to the company's reported financial figures, would actually have been breached on the corrected, restated basis, even though it appeared to be satisfied based on the original, uncorrected figures at the time. This requires the company to separately assess whether the covenant was, in substance, genuinely breached at the relevant date, which may have consequences for the classification of the related loan (a covenant breach can require reclassification of an otherwise long-term loan to current liabilities, particularly if the breach gives the lender a right to demand immediate repayment), and may also raise going concern and disclosure considerations, all as genuine consequences flowing from, but conceptually distinct from, the accounting restatement itself. Option C incorrectly assumes debt covenants are entirely insulated from a subsequent restatement, when a covenant calculated by reference to reported figures is directly affected once those figures are corrected. Option A incorrectly assumes an automatic, blanket voiding of the loan agreement, which is not an automatic accounting consequence and depends on the specific contractual terms and the lender's own response. Option B incorrectly assumes an automatic waiver by the lender, when a waiver requires the lender's own affirmative action, not merely the fact that the original figures happened not to show a breach.

54. A company discovers that, in the prior year's statement of cash flows, a cash outflow relating to the purchase of a non-current asset was incorrectly classified within operating activities rather than investing activities, where it properly belongs. This misclassification has no effect whatsoever on the prior year's reported profit, total assets, or total equity, since it affects only how an already-correct total cash movement is analysed and presented between the different categories of activity within the cash flow statement. Does this misclassification still require correction as a prior period error under IAS 8?

A) No correction is required at all, since a cash flow statement classification error, having no effect on profit or net assets, cannot be a material error for IAS 8 purposes by definition
B) The error is instead treated as a change in accounting policy, requiring only prospective application from the point of discovery, since it relates to presentation rather than measurement
C) Yes, correction and restatement of the prior year's cash flow statement classification is still required if the error is material, even though it has no effect on the prior year's reported profit, total assets, or total equity; materiality for IAS 8 purposes is not limited to errors affecting the statement of profit or loss or the statement of financial position, and a classification error between categories of activity within the cash flow statement can itself be material to users' understanding of the entity's cash flows, even with no effect on profit or net assets
D) Correction is required only if the error also happens to affect the prior year's reported profit or net assets; a pure presentation/classification error can never itself be considered material

Correct: C difficult IAS 7 Statement of Cash Flows, general classification requirements; IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraph 5 (definition of prior period errors)

IAS 8's definition of a prior period error is not limited to misstatements affecting reported profit or net assets; it also extends to errors in the presentation of items within the financial statements, including misclassification between categories. A cash flow statement classification error, misclassifying an investing cash outflow as an operating cash outflow, does not affect the overall total movement in cash, and therefore has no effect on profit, total assets, or total equity, but it can nonetheless materially affect users' understanding of the entity's operating cash-generating ability versus its investing activity, which is precisely the kind of information the classification of cash flows by activity is designed to convey; if the misclassification is material in this specific sense, correction and restatement of the prior year's cash flow statement is still required under IAS 8, illustrating that a 'material error' for IAS 8 purposes need not have any profit or net asset impact at all to still require correction. Option A and Option D both incorrectly assume materiality for IAS 8 purposes is confined to items affecting profit or net assets, ignoring that presentation and classification within the financial statements, including the cash flow statement, can themselves be materially misstated. Option B incorrectly recharacterises a genuine classification mistake as a change in accounting policy, which refers to a change between two acceptable ways of accounting for the same item, not a straightforward misclassification error.

55. An entity's non-current asset register shows a machine that reached the end of its estimated useful life and became fully depreciated (carrying amount reduced to its residual value) two years ago. However, the depreciation schedule was not updated at that time, and the entity has continued charging the same annual depreciation expense on the machine for the past two years, further reducing its carrying amount below the residual value that should have been its floor. This has just been discovered. How should this be treated?

A) As a change in accounting estimate under IAS 8, applied prospectively from the date of discovery, since depreciation always involves estimation and any adjustment to a depreciation charge is, by definition, a change in estimate.
B) No correction is required, since depreciation is a non-cash expense and any historical over-charge is immaterial to the current period's cash flows.
C) As a prior period error under IAS 8, since continuing to charge depreciation on an asset that had already reached the end of its useful life (and residual value floor) is a straightforward computational/application mistake, not a revision of an estimate; the excess depreciation charged in the two prior periods must be reversed retrospectively, restating the opening balance of retained earnings and the comparative figures for the earliest period presented, along with restoring the asset's carrying amount to its correct residual value.
D) The excess depreciation should be reversed by crediting the current period's depreciation expense account only, with no restatement of prior periods, since IAS 8 discourages restating comparative figures for depreciation-related matters.

Correct: C complex IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors (paragraphs distinguishing errors from changes in estimate); IAS 16 Property, Plant and Equipment

The distinction between a prior period error and a change in accounting estimate is central to IAS 8 and depends on the nature of the mistake, not merely on the fact that depreciation is involved. A change in estimate arises when new information or developments cause a genuine revision of a previous estimate (for example, revising a remaining useful life based on new information). Here, there was no new estimate at all -- the asset had already reached the end of its previously determined useful life and its residual value floor, and depreciation simply should have stopped being charged (or been capped) from that point. Continuing to charge depreciation beyond that point is a failure to correctly apply the entity's own existing depreciation policy and known facts -- a computational and application error, not a re-estimation. Under IAS 8, this is corrected retrospectively: the excess depreciation charged in each of the two prior periods is reversed, the asset's carrying amount is restored to its correct residual value, and the opening retained earnings and comparative figures for the earliest period presented are restated. Option A misclassifies the error as an estimate change; C wrongly dismisses a real, quantifiable error as immaterial without assessment; D wrongly avoids the required retrospective restatement.

56. Over the past four accounting periods, an entity made several small errors, each individually immaterial when assessed against that period's financial statements: a 300 misclassification in one period, a 450 omitted accrual in another, a 200 duplicate posting in a third, and a 500 casting error in the fourth. No single period's error was ever considered material on its own, and none was corrected at the time. On discovering all of them together during the current period's audit, how should materiality be assessed for the purposes of determining whether IAS 8's prior period error correction requirements apply?

A) Materiality should be assessed only on a period-by-period basis using each period's own individually immaterial error, meaning none of the errors need to be corrected, since IAS 8 permits errors to be ignored so long as each one, viewed alone, is immaterial to the period in which it originated.
B) The errors should be netted against each other, and only the net remaining amount, if material, needs to be corrected, since IAS 8 always requires errors within the same broad category to be offset before assessing materiality.
C) Since no single error was material at the time, none of them can ever become material later, regardless of how many further immaterial errors are discovered in subsequent periods, because materiality is fixed permanently at the point each error originated.
D) Materiality must also be considered on a cumulative basis: although each individual error was immaterial to its own period, the combined, cumulative effect of the accumulated errors, and their effect on the current comparative and opening balances, must be assessed together; if the aggregate effect is material to the financial statements as a whole (whether to a single affected period, or in aggregate to opening retained earnings), the errors constitute prior period errors requiring correction under IAS 8, since materiality assessment cannot be manipulated by deliberately splitting errors across periods or by assessing each in isolation when they collectively matter.

Correct: D difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors (materiality of errors); Conceptual Framework for Financial Reporting (materiality)

Materiality is not a mechanical, period-isolated test that can be evaded by discovering or correcting errors piecemeal. IAS 8 (informed by the broader materiality concept in the Conceptual Framework and IAS 1) requires that the cumulative effect of individually immaterial errors be assessed together where they relate to the same underlying matters or where their aggregation could reasonably be expected to influence users' decisions. A pattern of several small errors accumulating over multiple periods, none flagged as material alone, can collectively become material to the financial statements -- for example, materially misstating the opening retained earnings brought forward, or materially misstating a specific line item once aggregated. Where the cumulative effect is material, the errors must be treated and corrected as prior period errors under IAS 8's retrospective restatement approach. Option A wrongly permits errors to escape correction simply because they were split across periods; C invents an inappropriate netting rule not required (and potentially inappropriate if the errors relate to unrelated matters or would obscure gross misstatements); D wrongly claims materiality is permanently fixed at origination, when in fact subsequent discovery and aggregation is precisely when cumulative materiality must be reassessed.

57. While preparing the current year's annual report, an entity discovers that a disclosure note in the prior year's published financial statements (specifically, a note analysing the maturity profile of borrowings) contained an incorrect comparative figure due to a spreadsheet linking error. Critically, the primary financial statements themselves for that prior year (the statement of financial position, statement of profit or loss, and related totals) were entirely correct and unaffected; only the note's own internal comparative breakdown was wrong. How should this be corrected?

A) The full IAS 8 retrospective restatement machinery must be applied, including restating the primary statement of financial position and profit or loss for the prior period and presenting a third statement of financial position, since any error discovered in previously issued financial statements automatically triggers the complete IAS 8 restatement process regardless of where the error is located.
B) The correction should be made only in internal management accounts and never disclosed to users of the financial statements, since disclosure notes are not subject to the same error-correction requirements as the primary statements.
C) Because the error is confined entirely to the note's own disclosure and does not affect any primary financial statement figure, it can be corrected simply by presenting the corrected comparative figures within the note itself in the current year's financial statements (with an explanation of the correction), without needing to restate the primary statements, present a third statement of financial position, or reopen any general ledger balances, since the primary financial statements were never actually wrong.
D) The note cannot be corrected at all once the prior year's annual report has been issued; the error must simply be carried forward unchanged in all future disclosures.

Correct: C difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors (scope of restatement); IAS 1 Presentation of Financial Statements (notes)

IAS 8's full retrospective restatement requirements (restating comparative primary statements, adjusting opening retained earnings, and potentially presenting a third statement of financial position where the restatement affects the earliest comparative period) exist to correct errors that affect the primary financial statements' own recognised and measured amounts. Where an error is genuinely and entirely confined to a note's internal analysis or breakdown -- and does not touch any of the primary statements' figures, totals, or the note's own agreement to those totals -- the correction can appropriately be limited to presenting accurate comparative information within that note in the current period, together with a clear explanation, rather than triggering the full restatement apparatus designed for errors in the primary statements themselves. This reflects that the objective of correction is to give users accurate information, achieved here without disturbing statements that were never actually wrong. Option A over-applies the full restatement machinery indiscriminately; C wrongly suggests errors, once published, become permanently uncorrectable; D wrongly suggests suppressing disclosure of a known and correctable error from users.

58. An entity prepares unaudited quarterly interim financial reports throughout its financial year, followed by full annual financial statements after the year end. During the third quarter, the finance team identifies and corrects an error that had been made in the first quarter's interim report (an overstated revenue figure due to a cut-off mistake), adjusting the correction into the third quarter's results before the annual financial statements for that same year have been finalised or issued. Does this correction constitute an IAS 8 prior period error requiring retrospective restatement?

A) The correction should be ignored entirely and never adjusted in any period, since interim reports are not covered by IAS 8 at all.
B) No, because IAS 8's definition of a prior period error applies to errors discovered after the financial statements for that period have been authorised for issue; here, the error originated and was corrected within the same annual reporting period, before the annual financial statements (the relevant complete set of financial statements for external reporting purposes) for that year had been finalised or issued, so it is simply an in-year correction reflected in the current year's results, not a prior period error requiring restatement of a prior year's annual financial statements.
C) Yes, because any error identified after the period in which it originated, even within the same financial year and before the annual accounts are finalised, is automatically a prior period error requiring full IAS 8 retrospective restatement of the interim report.
D) The correction must be treated as a change in accounting policy rather than a correction of an error, since it affects how revenue was recognised in an earlier interim period.

Correct: B difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors (definition of prior period errors); IAS 34 Interim Financial Reporting

IAS 8 defines prior period errors as omissions or misstatements in an entity's financial statements for one or more prior periods -- periods for which financial statements have already been completed and issued. Interim reports within the same, still-ongoing annual reporting period are components of that year's overall reporting process, not separate, finalised annual periods in their own right. Correcting an error made in an earlier interim report of the same financial year, before the annual financial statements for that year have been authorised for issue, is simply an in-year correction: the error and its correction both fall within the current annual period, so the annual financial statements, once finalised, will reflect the correct full-year figures without needing IAS 8's prior period restatement mechanism (which is reserved for errors discovered after a period's financial statements were already finalised and issued). Option C incorrectly extends the prior period error definition to same-year interim reporting; C wrongly suggests interim errors are entirely outside IAS 8's scope of relevance; D mischaracterises a factual correction (a cut-off mistake) as a policy change.

59. An entity operates in three reportable segments and discovers a material prior period error: revenue from a specific class of contracts within its Manufacturing segment was recognised a full year too early due to a systematic cut-off failure, requiring retrospective restatement of the prior year's primary financial statements under IAS 8. The entity also publishes segment information as part of its financial statements. What is the correct treatment of previously reported segment information for the affected prior period?

A) The previously reported segment information for the affected prior period must also be corrected and restated consistently with the correction made to the primary financial statements, since segment disclosures are required to be consistent with, and derived from, the amounts used in preparing the entity's primary financial statements; restating the primary statements without correspondingly restating the related segment disclosures would leave the segment note inconsistent with, and contradicted by, the corrected primary figures.
B) Segment information is a voluntary supplementary disclosure and is therefore exempt from any correction; only the primary financial statements need to be restated, while the previously reported segment figures can be left unchanged in all future comparative presentations.
C) Segment information should be restated only for the current period going forward, with no correction to the comparative prior period segment figures, since segment restatement rules differ fundamentally from the primary statement restatement rules under IAS 8.
D) Because the error is entirely confined to timing within a single segment, no restatement of segment information is needed at all, since segment reporting only aggregates figures that are corrected automatically by restating the primary statements.

Correct: A complex IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors; IFRS 8 Operating Segments (consistency of segment information with primary statements)

Segment information, where required to be disclosed, must be consistent with the basis and amounts used in the entity's primary financial statements, since segment disclosures are essentially a further analysis of those same recognised and measured amounts by segment. When a prior period error requires retrospective restatement of the primary financial statements under IAS 8, the previously reported segment information for that same prior period must also be corrected and restated consistently -- otherwise the segment note would present figures that no longer reconcile to, and directly contradict, the restated primary statement amounts, undermining the reliability and internal consistency of the entire set of financial statements. Option B incorrectly treats segment disclosures as exempt or independent from the underlying correction; B incorrectly assumes restatement happens automatically without any action on the segment note itself; D invents an unsupported distinction between primary statement and segment restatement timing.

60. During the year, an entity migrated its accounting records to a new computerised accounting system. During the migration, a whole category of supplier invoices for utilities expenses was mistakenly mapped to the wrong general ledger account code, causing several months' worth of utilities costs to be posted instead to a general repairs and maintenance expense account. The error is discovered several months after the migration, once both affected account balances have been significantly distorted and used in interim reporting. What is the correct approach to correcting this error?

A) Since the total expense recognised in the income statement is unaffected in aggregate (both are operating expenses), no correction is needed; the misclassification between two expense accounts has no impact on profit and can be ignored.
B) The migration mapping itself must be corrected going forward to prevent recurrence, and in addition, the affected utilities expense and repairs and maintenance expense balances must be reconstructed and corrected for the amounts already misposted during the affected months, reclassifying the misposted amounts from repairs and maintenance to utilities expense so that both accounts, and any related disclosures or analyses that depend on the correct classification (such as expense analysis by nature, or comparisons against budgeted utilities costs), reflect the correct amounts; if material and relating to an already-reported period, this is corrected as an IAS 8 error.
C) The entire new computerised accounting system should be abandoned and the entity should revert to its previous system, since a mapping error during migration proves the new system is fundamentally unreliable.
D) The correction should be made only by adjusting the closing balances at the next year end, with no attempt to identify or reconstruct which specific months or transactions were affected, since reconstructing individual postings from a system migration is never possible.

Correct: B difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors (prior period errors); general internal control and expense classification principles

Although this error does not change total operating expenses or profit in aggregate (since both accounts are expenses), classification within the financial statements and underlying accounting records still matters: users, management, and disclosures (such as an expense analysis by nature, budget-to-actual comparisons, or covenant calculations tied to specific expense categories) can be materially affected by a systematic misclassification, and the underlying general ledger must reflect the true nature of each transaction regardless of its impact on the bottom line. The correct approach requires two things: fixing the mapping configuration in the new system so the error does not continue, and separately reconstructing and correcting the specific amounts already misposted during the affected months, moving them from the incorrect account to the correct one. Where this relates to amounts already reported in prior financial statements and is material, it is corrected as a prior period error under IAS 8, requiring appropriate restatement. Option A wrongly assumes only bottom-line profit impact matters, ignoring classification within the statements; C is a disproportionate and irrelevant operational response, not an accounting correction; D wrongly gives up on identifying the actual affected transactions, which is generally achievable by tracing the migration mapping fault to the specific supplier invoices and months affected.

61. An entity substantially modified the terms of an existing finance lease liability two years ago, which under the applicable lease accounting requirements should have resulted in the liability being remeasured using a revised discount rate reflecting the modified terms from the modification date onward. Due to an oversight, the finance team continued applying the original, pre-modification implicit interest rate to calculate finance charges on the lease liability for the two years since the modification, rather than the revised rate the modification required. This has just been discovered. How should this be characterised and corrected?

A) As a prior period error under IAS 8, because the requirement to remeasure the lease liability using a revised discount rate following a substantial modification was a known, applicable requirement at the time of modification that was simply not applied; the finance charges and lease liability carrying amount must be recalculated retrospectively from the modification date forward using the correct revised rate, with the cumulative effect corrected through opening retained earnings and comparatives restated for the earliest period presented.
B) As a change in accounting estimate, applied prospectively from the date of discovery, since interest rates and finance charge calculations are inherently estimation-based and any rate revision is, by nature, a change in estimate rather than an error.
C) No correction is needed, since the cumulative finance charge over the full remaining lease term will equal the same total regardless of which rate is used in the interim, so the timing of recognition does not matter.
D) The correction should only be applied from the current period forward, with no adjustment to the finance charges or lease liability carrying amount already recognised in the two affected prior years, since re-performing two years of finance charge calculations is impractical.

Correct: A difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors; IFRS 16 Leases (lease modifications and remeasurement)

This is a prior period error, not a change in accounting estimate, because the applicable lease accounting requirement to remeasure the lease liability at a revised discount rate following a substantial modification was a known, specific, and already-applicable requirement at the time of the modification -- it was simply not applied correctly. This is fundamentally different from a genuine change in estimate, which involves a revision to a previous estimate based on new information or developments; here, the correct rate to use was determinable at the modification date itself and the entity's own finance team simply failed to apply it, continuing to use the superseded rate instead. Because the error has persisted and compounded over two reporting periods, correcting it requires recalculating the finance charges and the lease liability's carrying amount retrospectively from the modification date, correcting the cumulative effect through opening retained earnings, and restating comparative figures for the earliest period presented, consistent with IAS 8's treatment of prior period errors. Option B misclassifies a failure to apply a known requirement as an estimate change; C is factually wrong, since using the wrong rate changes both the timing and the amount of finance charges recognised in each period even if a coincidental convergence might occur over the full term; D wrongly avoids the retrospective correction that IAS 8 requires, citing impracticality that does not genuinely apply here since the correct rate and modification date are both known and the recalculation is achievable.

62. An entity discovers that, in the prior year's financial statements, a foreign currency translation gain arising on consolidation of a foreign subsidiary was mistakenly recognised in profit or loss for the year, when it should instead have been recognised in other comprehensive income (as a movement in the foreign currency translation reserve), in accordance with the applicable requirements. Critically, because the amount was still included somewhere within the statement of profit or loss and other comprehensive income (just in the wrong section), total comprehensive income for the year, and total equity at the year end, were both correctly stated overall. What is the correct treatment of this discovery?

A) The correction should be made only in the current period's statement of profit or loss and other comprehensive income, with the prior year's comparative figures left showing the original, incorrect classification, since restating a comparative statement is only required when total equity itself changes.
B) Because the error relates to other comprehensive income rather than profit or loss, and other comprehensive income is a supplementary concept, it falls outside the scope of IAS 8's error correction requirements entirely.
C) No correction is required at all, since total comprehensive income and total equity were both correct in aggregate; because there is no bottom-line impact on either figure, the misclassification between profit or loss and other comprehensive income is immaterial by definition and can be left as originally presented.
D) This is still a prior period error requiring correction under IAS 8, notwithstanding that total comprehensive income and total equity were unaffected in aggregate, because the split between profit or loss and other comprehensive income is itself a required and meaningful distinction (profit or loss being a key subtotal relied upon by users, for example for earnings per share and performance assessment); the statement of profit or loss and other comprehensive income for the prior period must be restated to move the amount to its correct section, even though no restatement of the statement of financial position or total equity is needed.

Correct: D difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors; IAS 1 Presentation of Financial Statements (profit or loss and other comprehensive income); IAS 21 (foreign currency translation reserve)

A misclassification between profit or loss and other comprehensive income, even where it has no effect on total comprehensive income or total equity, is still a material presentational error requiring correction, because the distinction between profit or loss and other comprehensive income is itself substantive and relied upon by users -- profit or loss is a key performance subtotal used, among other things, in calculating earnings per share, assessing operating performance, and various covenant or bonus calculations, and other comprehensive income items are, by their nature, intended to be presented separately from profit or loss precisely because they are treated differently for these purposes. IAS 8 requires correction of prior period errors regardless of whether the error affects a net or bottom-line total; here, correction means restating the statement of profit or loss and other comprehensive income for the prior period to move the amount out of profit or loss and into other comprehensive income (correcting the foreign currency translation reserve movement accordingly), even though the statement of financial position and total equity require no restatement since they were already correct in total. Option C wrongly assumes no net effect means no material error; C wrongly avoids restating the comparative statement of profit or loss and other comprehensive income; D wrongly places other comprehensive income items outside IAS 8's scope, when IAS 8 applies to all elements of the financial statements.

63. Ellerton Industrial plc's long-term provision was originally discounted using a rate based on market yields prevailing at the time of original recognition. Two years later, market yields have changed materially, and management updates the discount rate used to measure the provision going forward, reflecting genuinely new market information that only became available over the intervening period. Is this a change in accounting estimate or a prior period error?

A) Neither a change in estimate nor an error, since discount rates are inherently uncertain and never require any accounting response at all
B) A prior period error, since the original discount rate is now shown, with hindsight, to have understated the provision's true present value
C) A prior period error only if the change in rate exceeds a specific quantitative threshold, and a change in estimate otherwise
D) A change in accounting estimate, applied prospectively, since the rate change reflects genuinely new market information that only became available after the original measurement, not a mistake in applying information already available at the time

Correct: D complex IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraphs 5 and 34

The distinction between a change in accounting estimate and a prior period error turns on whether new information has genuinely become available since the original estimate was made, or whether the original estimate was simply a mistake in applying information that was already available at the time. Here, the change reflects market yields that genuinely moved over the intervening two years -- information that did not exist at the time of original recognition -- so this is a change in accounting estimate, applied prospectively from the date of the change, with no restatement of the prior period's figures. Option B incorrectly applies hindsight to what was a reasonable estimate based on the information available at the time. Option C invents an inappropriate quantitative threshold distinguishing the two concepts, which IAS 8 does not use; the distinction is qualitative (new information versus a mistake), not based on the size of the resulting change. Option A wrongly suggests no accounting response is ever required for a genuine change in a key estimate.

64. A material prior period error is discovered to have originated within the individual financial statements of a partly owned subsidiary, whose results are consolidated by its parent, Wraxall Group plc. Correcting the error in the group's consolidated financial statements affects the subsidiary's reported profit for the affected prior period. How does this correction flow through to the presentation of non-controlling interests (NCI)?

A) The restated subsidiary profit for the affected period is reallocated between the owners of the parent and NCI based on the ownership percentages actually in place during that period, correspondingly restating the NCI balance
B) The entire correction is allocated to NCI only, since the error originated within the subsidiary in which NCI holds an interest
C) No restatement of NCI is required at all; only the parent's own consolidated retained earnings figure is adjusted
D) The entire correction is allocated to the owners of the parent only, with no adjustment made to NCI, since the error originated within the subsidiary's own records rather than the parent's

Correct: A difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraph 42; IFRS 10 Consolidated Financial Statements, paragraph B94

Where a prior period error originates in a subsidiary's own financial statements, correcting it in the consolidated financial statements requires the restated subsidiary profit for the affected period to be reallocated between the owners of the parent and non-controlling interests using the same ownership percentages that were actually in place during that period, exactly as the subsidiary's original (uncorrected) profit would have been allocated; NCI is not shielded from an error correction that affects the very entity in which it holds its own genuine ownership interest. Options D and B each incorrectly allocate the entire correction to only one class of owner, when both should share in the restated profit proportionately to their actual ownership interests during the affected period. Option C wrongly omits any adjustment to NCI's own carrying amount, which is inconsistent with the reallocation principle applied to any other change in the subsidiary's reported results.

65. Danesbury plc discovers that the weighted average number of ordinary shares used to calculate the comparative period's basic earnings per share figure was calculated incorrectly, due to a mistake in applying the retrospective bonus fraction following a bonus issue during the current year; the previously reported profit figure for the comparative period was, however, entirely correct. How should the comparative EPS figure be addressed?

A) The comparative EPS figure is left unchanged in the primary statements, with the correct calculation disclosed only in a note
B) The error is treated as a change in accounting estimate, applied prospectively, since it concerns a calculation input rather than a recognised transaction
C) The comparative EPS figure is restated to reflect the correct weighted average number of shares, even though the underlying profit figure itself requires no restatement at all
D) No restatement of EPS is required, since only the profit figure, not the share count, is relevant to a prior period error correction

Correct: C difficult IAS 33 Earnings per Share, paragraph 64; IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraph 42

A prior period error is not limited to errors in recognised transactions or balances; it also extends to errors in figures derived from them, including a mistake in calculating the weighted average number of shares used for earnings per share. Since the profit figure itself was correct but the share count used to derive EPS was miscalculated, the comparative EPS figure itself is restated to reflect the correct weighted average share count, illustrating that an EPS-specific error can require restatement independently of, and for entirely different reasons than, an error in the underlying profit figure (which would also require EPS restatement, but for a different reason). Option D wrongly assumes only profit-driven EPS restatements are required. Option A inappropriately relegates a required primary statement correction to a note only. Option B mischaracterises a genuine calculation mistake (a mistake applying the bonus fraction methodology) as a change in estimate, when no new information is involved, only a computational error.

66. Grendon Fabrications Ltd correctly recognised and measured a related party transaction in its financial statements for the prior year, but the required note disclosure describing the nature and value of the transaction was inadvertently omitted from the published financial statements entirely. This omission is discovered during preparation of the current year's financial statements. How should this be corrected?

A) A correcting journal entry is posted against opening retained earnings, even though no recognised amount was actually incorrect
B) No correction is possible, since the omission relates to a disclosure only and IAS 8 addresses only recognition and measurement errors
C) The transaction itself is derecognised and re-recognised in the current period, since the original disclosure requirement was not met
D) The omitted disclosure is added retrospectively within the comparative notes to the current year's financial statements, with no correcting journal entry required and no restatement of any primary statement figure, since the recognition and measurement themselves were always correct

Correct: D difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraph 5 (definition of prior period errors, including omissions in applying reporting requirements)

IAS 8's definition of an error is not confined to recognition and measurement mistakes; it also extends to omissions in the application of reporting requirements, including required disclosures. Where the underlying transaction was correctly recognised and measured, but a required disclosure was inadvertently omitted, the correction is simply to add the omitted disclosure retrospectively (typically within the comparative information presented in the current year's financial statements), since no primary statement figure was ever wrong and no correcting journal entry is needed. Option B is incorrect, since disclosure omissions do fall within IAS 8's error definition. Option A wrongly posts a journal entry where no recognised balance requires correction. Option C wrongly suggests a recognition-level correction is needed for what is purely a disclosure gap.

67. Wychwood Trading plc discovers, in the current year, a material error in the valuation of closing inventory three years ago; because closing inventory in one year becomes opening inventory in the next, this error has continued to distort each subsequent year's profit, compounding across three consecutive prior years before finally being discovered in the current, fourth year. How should this cascading error be corrected?

A) By restating only the most recent comparative period presented, since earlier periods are no longer presented in the current year's financial statements and therefore do not require separate restatement
B) By restating the opening balance of retained earnings for the earliest period presented that is affected, and separately restating each of the intervening comparative periods presented, to reflect the cumulative and period-specific effects of the error as it compounded
C) By recognising the entire cumulative effect of the error as a single adjustment within the current period's profit or loss, since restating three separate prior periods would be impractical
D) By ignoring the error entirely, on the basis that a self-reversing inventory error will eventually correct itself without any accounting intervention

Correct: B difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraphs 42-43

A material prior period error is corrected by retrospective restatement: adjusting the opening balance of assets, liabilities, and equity for the earliest prior period presented that is affected, and restating the comparative amounts for each prior period presented as if the error had never occurred. Where an error has compounded across several years before discovery, each of those years' own results were genuinely, separately misstated, so each affected comparative period presented must be individually restated, with the cumulative pre-comparative-period effect adjusted directly against the opening retained earnings of the earliest period presented. Option C incorrectly dumps the entire cumulative effect into the current period's profit or loss, which IAS 8 does not permit for a material error (this treatment is reserved for situations where restatement is genuinely impracticable). Option A wrongly limits restatement to only the most recent comparative period, ignoring the requirement to restate all presented affected periods. Option D is incorrect; even a self-reversing error still requires each individually affected period to be properly restated, since each period's own results were genuinely misstated at the time.

68. Purcell Chemicals Ltd discovers that, for the past several years, input VAT on certain categories of expenditure that are legally irrecoverable under the applicable VAT rules (such as business entertaining) has nonetheless been incorrectly reclaimed as recoverable input tax. How should this error be corrected in the financial statements, in addition to any separate correction required with the tax authority?

A) No correction to the financial statements is required at all, since VAT is a tax authority matter entirely separate from financial reporting
B) The VAT liability/payable balance is corrected to remove the amounts incorrectly treated as recoverable, and the related expense is retrospectively increased by the amount that should have been irrecoverable and included within cost/expense rather than reclaimed
C) Only the VAT control account is adjusted; the related expense figures require no correction, since VAT recoverability does not affect the underlying expense amount
D) The error is corrected prospectively only, by simply ceasing to reclaim input VAT on these categories of expenditure from the date of discovery onward

Correct: B complex IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraphs 41-42

Where input VAT has been incorrectly treated as recoverable when it was, in substance, irrecoverable under the applicable rules, this is a genuine prior period error with two related consequences: the VAT liability/payable balance must be corrected to remove the amounts that should never have been treated as recoverable, and, because irrecoverable VAT forms part of the cost of the related goods or services rather than a separate recoverable amount, the related expense (or asset cost, as applicable) for each affected period must also be retrospectively increased by the previously under-stated VAT-inclusive amount. Option C wrongly isolates the correction to the VAT balance alone, ignoring the consequential effect on the related expense. Option D wrongly treats what is a correction of a past error as if it were merely a prospective change in future practice. Option A wrongly assumes VAT recoverability has no financial reporting consequence, when it directly affects both a recognised liability and recognised expenses.

69. Amberwood Group plc's prior year consolidated financial statements retranslated a material foreign subsidiary's net assets using an incorrect closing exchange rate (taken from the wrong date). The error is discovered in the current year and is material. Which component of the financial statements is primarily restated to correct this error, and why?

A) The foreign currency translation reserve (within other comprehensive income/equity), since the original error was a mismeasurement of a translation adjustment that itself bypasses profit or loss under the group's translation method
B) Profit or loss for the prior period, since all prior period errors are corrected exclusively through the income statement regardless of where the original item was recognised
C) Retained earnings only, since all equity-related corrections are recorded there regardless of which specific reserve was originally affected
D) Neither profit or loss nor other comprehensive income; only the statement of financial position figures require adjustment, with no restatement of any prior period performance figures

Correct: A difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraph 42; IAS 21 The Effects of Changes in Foreign Exchange Rates, paragraph 39

Correcting a prior period error requires restating whichever component of the financial statements was originally affected by the error, restoring it to what it should have been. Since the original translation of a foreign subsidiary's net assets is, under the standard consolidation method, recognised as a movement in the foreign currency translation reserve within other comprehensive income/equity (not profit or loss), an error in that translation is corrected by restating the translation reserve itself, not profit or loss, since profit or loss was never where the original translation adjustment was recognised. Option B incorrectly assumes all error corrections flow through profit or loss regardless of where the original item sat; a prior period error correction restates whatever component was actually affected in substance. Option D wrongly ignores that a genuine equity/OCI component still requires correction, not just the statement of financial position in isolation. Option C wrongly reroutes a specifically identified reserve's correction through retained earnings instead of the reserve it actually affected.

70. Sedgemoor Holdings plc corrected a material prior period error in its previous year's financial statements. In the current year, it is discovered that this correction was itself calculated incorrectly, understating the intended adjustment. How should this fresh discovery be treated?

A) No further correction is required, since the underlying error has already been substantively addressed once
B) As a change in accounting estimate, since it relates to refining a previously recognised correction rather than an entirely new transaction
C) As a new prior period error in its own right, corrected using IAS 8's ordinary retrospective restatement mechanics, since a previous restatement is not itself exempt from further error correction if it, too, was miscalculated
D) Corrected only prospectively from the current period, since the original restatement already dealt with all retrospective aspects of the situation

Correct: C difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraphs 5 and 42

A correction of a prior period error is, like any other recognised amount, itself capable of being wrong; if a previous restatement is later discovered to have been calculated incorrectly, this is simply a further prior period error, corrected in exactly the same way as any other material prior period error would be, under IAS 8's ordinary retrospective restatement mechanics. There is nothing in IAS 8 that treats a restatement as immune from subsequent error correction. Option B mischaracterises a genuine calculation mistake within the original restatement as a change in estimate, when no new information is involved. Option A wrongly assumes a single correction attempt, however flawed, discharges the obligation to present accurate financial statements. Option D wrongly denies the necessary retrospective restatement that a material error, including an error within an error correction, requires.

71. After Camelford Engineering plc's financial statements have been authorised for issue, it is discovered that the directors' report (the narrative strategic report accompanying, but not forming part of, the audited financial statements) contains a factually inaccurate statement about a matter unrelated to any recognised or disclosed financial statement figure. How is this inaccuracy corrected?

A) By treating it as a prior period error under IAS 8, requiring retrospective restatement of the comparative financial statements
B) By adjusting the opening balance of retained earnings in the next year's financial statements, since any error discovered after authorisation for issue is corrected this way
C) No correction is possible or required once the annual report has been authorised for issue and published
D) Through a separate mechanism specific to the directors' report (such as a corrigendum or a re-issued report) under the applicable company law/reporting framework, rather than through IAS 8's prior period error restatement mechanics, which apply only to the financial statements themselves

Correct: D difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraph 5 (scope: financial statements); applicable company law reporting requirements

IAS 8's prior period error definition and its retrospective restatement requirements apply specifically to the financial statements -- the primary statements and their notes -- not to the wider annual report package, which may include other documents such as a directors' report or strategic report that are outside the scope of the financial statements themselves, even though they typically accompany them. A factual inaccuracy confined entirely to such a document, with no effect on any recognised or disclosed financial statement figure, is therefore addressed through whatever separate mechanism the applicable company law or regulatory framework provides for correcting that specific document, rather than through IAS 8. Option A incorrectly extends IAS 8's scope beyond the financial statements themselves. Option B wrongly applies a financial statement restatement mechanic to a document outside that scope. Option C wrongly assumes no correction mechanism exists at all.

72. A group's consolidation working papers have, for several years, failed to eliminate intercompany sales and purchases between two subsidiaries, materially inflating both consolidated revenue and consolidated cost of sales by the same amount each year, with no effect whatsoever on consolidated gross profit, net profit, or total net assets in any of the affected years. Is retrospective restatement required under IAS 8?

A) Yes; restatement may still be required under IAS 8's materiality principle if the gross overstatement of revenue and cost of sales is material to the financial statements as a whole, even though there is no effect on profit or net assets
B) No; only errors affecting the statement of financial position, not the statement of profit or loss in isolation, can ever be material under IAS 8
C) Yes, but only if the error also happens to affect a debt covenant or other externally monitored financial ratio
D) No; because the error has no effect on profit or net assets in any period, it falls outside IAS 8's definition of a material error requiring restatement

Correct: A difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraphs 5 and 42; IAS 1 Presentation of Financial Statements, paragraph 7 (definition of material)

Materiality under IAS 8 is not confined to errors that affect profit or net assets; an omission or misstatement is material if it could reasonably be expected to influence the decisions that users make on the basis of the financial statements, which can include gross presentation figures such as revenue and cost of sales, even where they net to no effect on the bottom line, since users may rely on revenue trends, gross margin percentages, or other metrics that would be distorted by the intercompany elimination failure. This mirrors the broader principle that a material error need not have any profit or net asset impact to require correction. Option D and Option B both incorrectly assume materiality requires a bottom-line or net asset effect. Option C wrongly makes restatement contingent on an unrelated, additional consequence (a covenant breach) rather than on the error's own materiality to the financial statements as a whole.

73. Rushmere Retail plc discovers that a material expense item has, for the prior year, been incorrectly buried within a broader 'other operating expenses' line item rather than being separately disclosed as its own line item, as required by IAS 1 given its size and relevance to understanding the entity's financial performance. Total profit for the prior period was correctly stated. How should this be corrected?

A) No correction is required at all, since total profit was correctly stated and presentation-only matters fall outside the scope of IAS 8
B) As a change in accounting estimate, since it concerns the aggregation level at which expenses are presented
C) As an IAS 8 error correction, reclassifying and separately disclosing the item in the comparative figures, even though total profit for the period requires no restatement at all
D) As a change in accounting policy, since it concerns how items are presented within the financial statements

Correct: C complex IAS 1 Presentation of Financial Statements, paragraph 85; IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraph 5

IAS 1 requires additional line items, headings, and subtotals to be presented when relevant to an understanding of the entity's financial performance, and inappropriately aggregating a material item within a broader line item so as to obscure it from users is treated as an error in applying that presentation requirement, falling within IAS 8's broader definition of a prior period error (which extends beyond recognition and measurement mistakes to also cover presentation and disclosure failures). The correction here is to reclassify and separately present the item within the comparative figures, even though this has no effect on total profit for the period, since the error is confined to presentation rather than to the recognised amount itself. Option A incorrectly assumes only bottom-line-affecting matters fall within IAS 8's scope. Option D mischaracterises a correction of a presentation error as if it were a deliberate, voluntary change in accounting policy. Option B wrongly treats a presentation requirement as if it were an estimate.

74. Following a prior year business combination, Ellingham Group plc originally recognised a gain on a bargain purchase, having assessed the fair value of the identifiable net assets acquired as exceeding the consideration paid. A subsequent review this year reveals that the original fair value assessment of one significant acquired asset contained a material error; correcting it would have resulted in positive goodwill arising instead of a bargain purchase gain. How should this be corrected?

A) Only the specific misvalued asset is corrected going forward, with no reversal of the originally recognised gain and no recognition of goodwill
B) No correction is made to the acquisition accounting itself; only additional disclosure is added describing the original valuation error
C) The correction is treated entirely prospectively, recognising goodwill for the first time in the current period based on today's fair values, with no restatement of the original acquisition date accounting
D) The entire acquisition accounting is reworked based on the corrected fair values, the originally recognised bargain purchase gain is reversed, and the resulting positive goodwill is recognised and tested for impairment from the original acquisition date forward, as a prior period error

Correct: D difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraph 42; IFRS 3 Business Combinations, paragraphs 32 and 34

A material error in the original fair value measurement of identifiable net assets acquired in a business combination is a prior period error in the initial acquisition accounting itself, not a mere update to be applied going forward. Correcting it requires reworking the entire acquisition accounting using the corrected fair values as at the original acquisition date, which, on the facts given, converts the originally recognised bargain purchase gain into positive goodwill; that goodwill is then recognised from the original acquisition date, subject to impairment testing from that date forward (impairment losses that would have been recognised in the intervening periods, had the goodwill existed, form part of the same retrospective restatement). Option A wrongly limits the correction to only the specific asset without addressing its consequential effect on the overall combination accounting. Option C incorrectly recognises goodwill only prospectively, using current fair values, rather than restating the original acquisition-date accounting. Option B understates the required response, since this is a measurement error requiring substantive correction, not merely additional disclosure.

75. Kettleworth Bank Ltd relies solely on historical loss rates to measure its expected credit loss allowance at the prior year end, even though clear, reliable forward-looking information indicating a significant economic downturn was already available and known to management at that reporting date, but was not incorporated. This omission is discovered in the current year. Is this a prior period error or a change in accounting estimate?

A) A prior period error, since reliable forward-looking information that already existed and was known at the prior reporting date was simply not incorporated into the estimate, rather than the estimate later needing revision because of genuinely new information
B) A change in accounting policy, since it concerns the methodology used to measure expected credit losses
C) A change in accounting estimate, applied prospectively, since expected credit loss allowances are inherently forward-looking and subject to revision over time
D) Neither a change in estimate nor an error, since expected credit loss estimates are always based on historical data by design

Correct: A difficult IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, paragraph 5; IFRS 9 Financial Instruments, paragraph 5.5.17

The key distinguishing question is whether the information relied upon for the corrected estimate already existed and was available at the original reporting date (an error, since it should have been incorporated at the time), or whether it only became available afterwards (a change in estimate, applied prospectively). Here, the reliable forward-looking information indicating a downturn was already known to management at the prior reporting date but was simply omitted from the calculation; this is a mistake in applying information already available at the time, meeting IAS 8's definition of a prior period error, requiring retrospective restatement, and is fundamentally different from a genuine subsequent revision to the estimate based on new information that only emerges after that reporting date. Option C incorrectly treats an omission of already-available information as if it were an ordinary, expected forward-looking revision. Option D wrongly assumes no forward-looking information should ever be incorporated. Option B mischaracterises a failure to correctly apply an existing methodology as if it were a change to the methodology itself.