Extraordinary Items and Prior Period Errors: Current IFRS Treatment

Older accounting material often refers to extraordinary items, prior-year adjustments and fundamental errors. Current IFRS terminology is different. IFRS financial statements do not use an extraordinary-items category, while IAS 8 distinguishes accounting policy changes, accounting estimate changes and prior-period errors.

Correct classification matters because the accounting treatment can be retrospective or prospective and can affect comparative statements, opening equity and disclosures.

Are Extraordinary Items Allowed under IFRS?

No separate extraordinary-items category is presented in current IFRS financial statements. An income or expense can be unusual in size, nature or frequency, but it remains classified within the applicable profit-or-loss category and is disaggregated or explained when material.

IFRS 18, effective from 1 January 2027, does not introduce a defined unusual-income-and-expense category. Instead, it strengthens aggregation, disaggregation, faithful labelling and disclosures about management-defined performance measures.

IAS 8 Classification Framework

Issue	Meaning	Normal treatment
Accounting policy change	Change in principles, bases, conventions, rules or practices.	Retrospective unless specific transition rules apply or retrospective application is impracticable.
Accounting estimate change	Change caused by new information, new developments or more experience.	Prospective in the period of change and future periods affected.
Prior-period error	Omission or misstatement caused by failure to use, or misuse of, reliable information available when prior statements were authorised.	Retrospective restatement unless impracticable.
Current-period error	Error discovered before current statements are authorised.	Correct in the current reporting process.

Accounting Policy Changes

A policy change occurs when an entity changes how it recognises, measures or presents a transaction or event. A change is made when required by an IFRS Standard or when the new policy provides more reliable and relevant information.

Retrospective application means adjusting comparative amounts as if the new policy had always been applied, subject to the applicable transition provisions and impracticability requirements.

Accounting Estimate Changes

Estimates are monetary amounts subject to measurement uncertainty. Examples include useful lives, residual values, expected credit losses, inventory obsolescence and warranty obligations.

When new information changes an estimate, the effect is recognised prospectively. It is not an error simply because the earlier estimate differs from the final outcome.

Prior-Period Errors

Prior-period errors arise from mathematical mistakes, incorrect application of policies, oversights, misinterpretation of facts or fraud when reliable information was available. A material error is corrected retrospectively by restating comparative amounts and, when necessary, the opening balances of assets, liabilities and equity for the earliest period presented.

Retrospective Restatement Example

Assume equipment costing $120,000 was incorrectly expensed in Year 1. It should have been capitalised and depreciated over six years with no residual value. The error is discovered in Year 3.

Item	Correct amount for Year 1	Amount originally recorded	Restatement effect
Equipment cost capitalised	$120,000	$0	Increase asset by $120,000 before depreciation.
Year 1 depreciation	$20,000	$0	Increase Year 1 expense by $20,000.
Net effect on Year 1 profit	Decrease by $20,000 rather than $120,000	Decreased by $120,000	Increase comparative profit by $100,000 before tax.

The comparative statement is restated, tax effects are considered and the correction is explained. The Year 3 profit is not charged with the full historical correction.

Estimate Change Example

Equipment has a carrying amount of $60,000 and a remaining useful life of three years. New technical information indicates a remaining life of five years. The revised annual depreciation is $12,000, assuming no residual value. Prior periods are not restated because this is a change in estimate based on new information.

Impracticability

Retrospective application or restatement can be impracticable when the effects cannot be determined after making every reasonable effort, when assumptions about management intent would be required or when significant estimates cannot be distinguished from later information. Impracticability is a high threshold, not a convenience exemption.

Disclosure Requirements

Depending on the issue, disclosures commonly include the nature of the change or error, the amount of adjustment for each affected line item and EPS, the effect on earlier periods and an explanation when retrospective treatment is impracticable.

Unusual or One-Off Income and Expenses

Restructuring costs, litigation, disaster losses or disposal gains may be unusual, but they are not labelled extraordinary. Material items are separately presented or disclosed when that helps users understand financial performance. Descriptions should faithfully represent the item rather than use vague labels such as “special” or “non-recurring” without explanation.

Common Mistakes

• Using “extraordinary item” as a current IFRS line item.
• Treating a new estimate as an error because the amount changed.
• Correcting a material prior-period error entirely in current profit.
• Calling every voluntary change an accounting policy improvement.
• Ignoring tax and EPS effects of a retrospective restatement.
• Using impracticability merely because reconstruction is time-consuming.

Decision Checklist

1. Identify what changed and why.
2. Determine whether reliable information existed in the earlier period.
3. Classify the issue as policy, estimate or error.
4. Determine retrospective or prospective treatment.
5. Calculate tax, equity, comparative and EPS effects.
6. Prepare clear disclosures and obtain appropriate approvals.

Frequently Asked Questions

Are extraordinary items permitted under IFRS?

No separate extraordinary-items category is presented. Material unusual items are classified and disclosed under the applicable requirements.

What is the main difference between an estimate change and an error?

An estimate change arises from new information or developments; an error reflects failure to use or misuse of reliable information that was available.

Are prior-period errors corrected through current profit?

Material prior-period errors are normally corrected retrospectively through comparative restatement and opening balances.

Is a change in depreciation method a policy or estimate change?

It is generally treated as a change in accounting estimate because it reflects a revised pattern of consumption.

What does retrospective application mean?

It means applying the new policy or correcting the error as though it had always been applied or the error had never occurred.

Related Guides

• Trading and Profit and Loss Account
• Substance Over Form and Periodicity
• Money Measurement Concept
• Financial Accounting Guide

Conclusion

The most useful analysis combines correct calculations with context. A ratio, valuation, reconciliation or accounting treatment should be applied consistently, supported by evidence and interpreted with the entity’s facts, reporting framework and materiality in mind.

Authoritative references: IFRS Foundation — IAS 8, IFRS Foundation — IFRS 18, IFRS Foundation — IFRS 18 Feedback Statement.

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