Three requests reach an accountant in one morning: update an inventory write-down using new information, change the costing formula and correct a freight invoice recorded twice. All three can alter inventory, but they are not the same kind of change. Calling them all “inventory adjustments” hides their causes and may send their effects to the wrong period.
IAS 8 distinguishes accounting policies, estimates and error corrections. The point is not terminology alone. What changed: the rule being applied, inputs requiring estimation, or information that should have been used correctly from the outset? The answer guides review, timing and disclosure.
New information does not automatically reveal an old error
A business expected net recovery of SAR 95 per unit from a 100-unit batch costing SAR 100 each. Appropriate evidence supported a SAR 500 write-down at the time. Later, a new competitor emerged and expected net recovery fell to SAR 88. Holding other assumptions constant, the total reduction becomes SAR 1,200, with a SAR 700 increase attributable to the new information.
The later outcome alone does not establish that the original estimate was wrong. Ask what information existed when it was prepared and how it was used. If the earlier evidence was appropriate and circumstances subsequently changed, the estimate changes prospectively according to its effects. If the first worksheet ignored a confirmed offer or contained a broken formula, a different assessment is needed.
Retain each review's assumptions and dated evidence. Without them, it can become impossible to distinguish market changes from unsupported adjustments intended to improve profit. The discussion becomes competing opinions rather than a comparison of what was known at each date.
A different rule needs a different justification
Moving from one cost formula to another is not merely adjusting a percentage in a report. Assess it as a policy change, considering whether it is permitted, why it is justified and what treatment is required. Software convenience or a higher current-year margin is not a sufficient explanation.
Do not change the system setting before accounting understands its effect on balances and comparative information. Prepare a movement sample, calculate results under both methods and identify available prior-period information. Transition provisions, specific requirements and impracticability exceptions need professional review. They should not become a “from today only” choice simply because the software offers one.
A duplicated document does not become an estimate
A SAR 6,000 freight invoice was entered twice even though the correct original was available. That concerns an error, not a changed expectation. Start by tracing the duplication's effects: does the entire amount remain in unsold inventory, or has some reached cost of sales? Which periods were affected, and have their financial statements been issued?
Do not charge the whole difference to the current month before answering those questions. The responsible specialist determines the appropriate treatment, including prior-period error materiality and retrospective correction where applicable. Preserve a clear trail from the duplicated document to the correction rather than silently deleting it and leaving an unexplained apparently correct balance.
| Before approving the request | Evidence to document |
|---|---|
| Estimate change | New information, its date, and old and revised assumptions |
| Policy change | Justification, accounting basis, transition and comparative effects |
| Error correction | Correct available information and affected periods and balances |
Once classification is settled, distinguish approval of the accounting conclusion from implementation in the software. Someone reviews the rationale and effects; an authorised person makes the change; balances and reports are then reconciled. This is a practical control suggestion, not a requirement that every business adopt the same staffing structure.
A good close does not mean no adjustments ever occur. It means a reader can understand why a number changed: new knowledge, correction of faulty information or a justified policy change. The adjustment record then becomes part of the explanation of results rather than a container for unexplained differences.
Sources & further reading
Visit the original source to explore the concept and its wider context.
General educational content. Appropriate treatment depends on your business and accounting policies; consult your accounting professional when applying it to business records.
