ASPE 1506: Changes in Accounting Estimates

Definition

An accounting estimate is an approximation of a monetary amount in the absence of a precise means of measurement. Examples include the useful life of equipment, the allowance for doubtful accounts, and the warranty provision. A change in estimate is an adjustment to the carrying amount of an asset or liability, or to the periodic amount of consumption, resulting from new information or new developments (ASPE 1506.05).

Key rules

ASPE 1506 requires prospective application for changes in estimates: the new estimate is applied from the date of the change, affecting the current and, if relevant, future periods. Prior-period comparatives are not restated.

Distinguishing a change in estimate from a change in policy is critical:

Assess the substance of the change. If policy and estimate effects cannot be distinguished, treat it as an estimate change; combining unrelated changes does not automatically make all of them prospective.

Example

A CCPC revises the useful life of its main server from 4 years to 6 years based on actual usage patterns. At the start of the year, the server has a net book value of $2,400 after two years of amortization, with an assumed zero residual value.

The new $600 annual amortization applies from the current year onward. No entry is made against retained earnings, and prior-year comparatives are left unchanged. The nature of the change and its effect on current income are disclosed in the notes.

Common mistakes

• Restating comparatives for a change in estimate. Estimate changes are prospective only.
• Classifying a revised useful life as a policy change. It is an estimate.
• Ignoring the disclosure requirement under ASPE 1506. Even a prospective change requires a note if the effect is material.
• Using an estimate change as a disguised way to correct a prior-period error. If the earlier estimate was clearly unreasonable at the time, the adjustment is an error, not an estimate update.
• Forgetting to update depreciation schedules in the accounting system after the revision. The system should automatically apply the new life going forward.

Related concepts

Estimate changes sit alongside policy changes and error corrections in ASPE 1506. Measurement uncertainty disclosures live under ASPE 1508 and in the notes.