3.4 Materiality, Performance Materiality & Tolerable Misstatement (ISA 320)

3.4 Materiality, Performance Materiality & Tolerable Misstatement

Materiality focuses audit work and evaluation on matters capable of influencing users. Under ISA 320, misstatements, including omissions, are material if they could reasonably be expected—individually or in aggregate—to influence economic decisions taken on the basis of the financial statements.

Overall and specific materiality

The auditor determines materiality for the financial statements as a whole. The process normally selects a benchmark relevant to users, considers whether the benchmark is stable and applies an engagement-specific percentage. Possible benchmarks include profit, revenue, expenditure, assets or net assets. The standard does not prescribe a universal percentage for any category of entity.

The auditor may also set a lower specific materiality for particular transactions, balances or disclosures when smaller misstatements could reasonably influence users. Examples can include senior remuneration, compliance-sensitive expenditure or a disclosure central to public accountability.

Public-sector context broadens the judgment. Legislatures and citizens may care about legal authority, stewardship, fairness and sensitive programmes in addition to financial-statement magnitude. This does not mean that every technical breach is automatically material; the auditor evaluates its nature, circumstances, reporting mandate and effect.

Performance materiality

Performance materiality is an amount set below overall materiality to reduce to an appropriately low level the probability that the aggregate of uncorrected and undetected misstatements exceeds overall materiality. It responds to aggregation risk.

Suppose overall materiality is EUR 1 million. Several separate errors below EUR 1 million could aggregate above it. The auditor therefore plans procedures using lower working amounts. In setting them, the auditor considers the understanding of the entity, history of misstatements, control environment, expected number and distribution of errors, and changes during the audit.

Professional firms may use ranges as internal starting points, but ISA 320 does not require “50%,” “75%” or any other fixed proportion. A percentage without engagement reasoning is not a substitute for judgment.

Tolerable misstatement

For a sampling procedure, tolerable misstatement is the monetary amount set by the auditor for the population, below which the auditor seeks an appropriate level of assurance that actual population misstatement does not exceed that amount. It is an application of performance materiality to the procedure, not necessarily the same amount used everywhere in the audit.

Lower tolerable misstatement generally increases the evidence needed, but sample size also depends on expected misstatement, population and sampling design. Qualitative issues and individually significant items may require separate treatment.

Clearly trivial under ISA 450

The auditor accumulates identified misstatements other than those that are clearly trivial. Clearly trivial does not mean merely “not material”; it means a wholly different, much smaller order of magnitude and clearly inconsequential by size, nature and circumstances. If there is uncertainty, the matter is not clearly trivial.

The auditor sets an engagement-specific threshold. ISA 450 does not prescribe 5%, 10% or another universal formula. A small amount can still require attention where it suggests fraud, deliberate bias, unlawful conduct, a control failure or a recurring pattern.

The ECA’s 2% regularity threshold

For the European Court of Auditors’ regularity assessment of an audited expenditure population, 2% is the established quantitative materiality threshold. Keep this public-sector compliance benchmark distinct from financial-statement benchmark percentages under ISA 320.

An estimated level of error above 2% is important evidence that expenditure is materially affected by error. The opinion also depends on the confidence interval and the nature and pervasiveness of errors; the threshold does not mechanically decide between qualified and adverse opinions.

Reassessment and evaluation

Materiality is revised when information obtained during the audit would have caused a different initial amount. At completion, the auditor evaluates corrected and uncorrected misstatements individually and in aggregate, including qualitative aspects and prior-period effects. The working papers should document the users, benchmark, amount, performance materiality, any specific levels, changes and final evaluation.

A sound materiality framework therefore connects planning, sampling, error accumulation, communication and reporting without pretending that one percentage can replace professional judgment.

Communication also matters. The auditor reports accumulated uncorrected misstatements to the appropriate level of management and, where required, those charged with governance, requesting correction and evaluating management’s reasons for leaving items uncorrected. The final representation does not replace audit evidence. The auditor considers whether uncorrected items reveal bias, affect comparative information or require a modified opinion.