Changes in Accounting Estimates
A change in accounting estimate is applied prospectively under ASPE 1506 and does not require restatement of prior-period comparatives.
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:
When a change combines a policy and an estimate (for example, changing both the amortization method and the useful life), ASPE 1506 treats it as a change in estimate and applies it prospectively.
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.
Revised annual amortization (straight-line, remaining life)
New amortization = Net book value / Remaining revised life
= $2,400 / 4 remaining years = $600 per year
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 and in ASPE 1506. Measurement uncertainty disclosures live under ASPE 1508 and in the .
Authority
- CPA Canada Handbook (ASPE) Section 1506 Accounting Changes
- ASPE Section 1508 Measurement Uncertainty
See also
Related entries
Accounting Policy Changes
ASPE 1506 governs voluntary and required changes in accounting policy, which are generally applied retrospectively with restated comparatives.
Correcting Prior-Period Errors
A prior-period error is corrected under ASPE 1506 by retrospective restatement of the affected comparatives and opening retained earnings.
Notes to the Financial Statements
The notes disclose accounting policies, supporting schedules, commitments, and other information needed to understand the primary financial statements.
This entry is for general reference. It does not constitute professional tax advice. Consult a qualified Canadian accountant for your specific situation.