What is the clearly trivial threshold?
ISA 450.5 requires auditors to accumulate all misstatements identified during the audit, other than those that are "clearly trivial." The clearly trivial threshold is the filter that determines which misstatements are too small to warrant tracking on the summary of audit differences.
The threshold acts as a practical efficiency measure. Without it, auditors would need to track every cent of difference found during testing. ISA 450.A2 defines "clearly trivial" as amounts of a wholly different (smaller) order of magnitude than materiality — not simply amounts that are "not material."
In practice, most firms set the clearly trivial threshold at 3–5% of overall materiality. At 5%, twenty excluded misstatements of the same size would equal overall materiality, which is why exceeding this percentage becomes difficult to justify. Misstatements above the threshold but below performance materiality fall into a middle zone — they must be accumulated and evaluated, but they do not individually require additional testing.
Key Points
- It is an accumulation filter, not a testing threshold. The clearly trivial threshold determines which misstatements are tracked on the summary of audit differences — it does not affect the scope or nature of testing.
- "Clearly trivial" is not the same as "not material." ISA 450.A2 makes this distinction explicit. Many misstatements are immaterial but still above the clearly trivial threshold and must be accumulated.
- Common range is 3–5% of overall materiality. The standard does not prescribe a percentage, but the "wholly different order of magnitude" requirement limits how high it can reasonably be set.
- Systematic errors below the threshold still require investigation. The accumulation filter does not override professional judgement about what a pattern of small misstatements might indicate about controls or fraud.
Why it matters in practice
Setting the clearly trivial threshold too high creates a gap between what the auditor tracks and what could aggregate to a material amount. If the threshold is set at 10% of materiality, only ten excluded misstatements of the same size would equal overall materiality — a scenario that is far from implausible on a large engagement with hundreds of testing items.
The middle zone between clearly trivial and performance materiality is where most evaluation judgement happens. Misstatements in this zone are individually immaterial but must be accumulated. At completion, the auditor evaluates whether the aggregate of accumulated misstatements (corrected and uncorrected) approaches or exceeds overall materiality. A well-calibrated clearly trivial threshold ensures this evaluation captures enough data to be meaningful.
The threshold also interacts with systematic errors. A recurring misstatement of a small amount — say a rounding error applied to every invoice — may fall below the clearly trivial threshold on each individual occurrence but indicate a control deficiency that produces material aggregate error across the population. The accumulation filter does not replace the obligation to investigate the nature and cause of identified misstatements.
Key standard references
- ISA 450.5: Requirement to accumulate all misstatements identified during the audit, other than those that are clearly trivial.
- ISA 450.A2: Application guidance defining "clearly trivial" as a wholly different order of magnitude from materiality, and distinguishing it from "not material."
- ISA 450.11: Requirement to evaluate the effect of uncorrected misstatements, individually and in aggregate, on the financial statements.
- ISA 320.10: Determining materiality for the financial statements as a whole, which is the anchor for the clearly trivial calculation.
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Frequently asked questions
What percentage of materiality is the clearly trivial threshold?
Most firms set it at 3-5% of overall materiality. ISA 450.A2 does not prescribe a specific percentage, but requires the threshold to be of a 'wholly different order of magnitude' from materiality. Anything above 5% of overall materiality makes that argument difficult to sustain, as twenty excluded misstatements of the same size would equal overall materiality.
What is the difference between clearly trivial and not material?
ISA 450.A2 explicitly states that 'clearly trivial' is not another expression for 'not material.' A misstatement can be immaterial but still above the clearly trivial threshold, meaning it must be accumulated on the summary of audit differences and evaluated at completion. The clearly trivial threshold is a stricter filter — only amounts of a wholly different order of magnitude are excluded.
Should below-threshold misstatements ever be investigated?
Yes. The threshold applies to accumulation, not investigation. If a below-threshold misstatement indicates a systematic error (a recurring journal entry pattern, a control deficiency), the auditor should investigate the root cause regardless of the amount. The accumulation filter does not replace professional judgement about what the error might indicate.