FAR Accounting Changes · Updated November 2026

Principle, Estimate, or Error: How Do You Classify the Change?

Identify what changed before memorizing the accounting treatment.

Change in principle

The entity changes from one acceptable accounting principle to another. Applicable changes can require retrospective treatment unless an exception applies.

Change in estimate

New information changes an estimate such as useful life, residual value, warranty estimate, or allowance. These are generally handled prospectively.

Estimate effected by principle

Some changes blur categories, so apply the specific guidance rather than forcing a simplistic mnemonic.

Error correction

An error means prior financial statements were incorrect based on information that should have been properly accounted for.

The takeaway

New information about the future is usually an estimate. Fixing something that was wrong before is an error.

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FAQ

Is changing useful life an error?

Usually a change in estimate when based on new information.

Are estimate changes retrospective?

Generally no.

Does every principle change get retrospective treatment?

Apply the relevant guidance and exceptions.