Several individually small errors can combine into a material misstatement, and an audit may leave some errors undiscovered. Performance materiality is an amount or amounts below the applicable materiality level, used in nonissuer audit planning to address that combined exposure.
The purpose of performance materiality in an audit is to reduce the probability that aggregate uncorrected and undetected misstatements exceed materiality. The auditor seeks an appropriately low probability through the planning amount and related procedures; the buffer cannot guarantee the outcome.
Aggregation risk is the possibility that misstatements across areas, including those remaining undetected, collectively become material to the financial statements. Planning every area as though it alone could contain the full materiality amount would leave insufficient protection against that combination.
The thresholds answer different planning questions:
Overall materiality and any user-sensitive lower materiality are inputs here; selecting their benchmarks belongs to the separate materiality determination topic. This lesson develops the intervening planning judgment, without extending into sampling execution or final misstatement evaluation.
Common mistakes
- Wrong percentage. Applying the isolated-error rate in Example 2 disregards the supplied methodology's separate condition for recurring errors.
- Mechanical account allocation. Assigning revenue tolerable misstatement solely in proportion to account size omits the necessary account-specific judgment.
- Double-counted history. Adding the original prior-year effect duplicates history already reflected in the cumulative exhibit's $80,000 current-year overstatement through the $12,000 release effect.
Bottom line
- Performance materiality and tolerable misstatement support planning against aggregate uncorrected and undetected misstatements without guaranteeing their total.
- Nonissuer performance materiality is below applicable materiality; sampling tolerable misstatement may equal or be below relevant performance materiality.
- Issuer tolerable misstatement applies at the account or disclosure level and remains below applicable materiality.
- Expected errors, prior experience, entity circumstances, and planned evidence support judgment; no universal percentage determines the amount.
Exam shortcut
Identify the regime before choosing terminology. For a nonissuer sampling question, distinguish performance materiality from the amount assigned to the sampled population. Circle the supplied condition before multiplying. In these examples, recurring errors select 50%; isolated corrected errors select 70%. Do not import either rate into an unrelated question. Track two separate amounts: selected planning sensitivity and the gap below overall materiality.
The full lesson (about 3,547 words, 24 min read) adds 2 worked examples, all 5 common mistakes, a self-check, free in the app.
Learning objectives
- II.D2
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