What it means
Auditors start by setting overall materiality for the financial statements as a whole, usually as a percentage of a benchmark such as revenue, profit before tax or total assets. That figure answers the question of how wrong the accounts could be before a reasonable user would be misled.
The difficulty is that an audit tests samples rather than everything, and errors found in a sample imply further errors that were not found. Performance materiality exists to create a buffer for that risk, so auditors test to a stricter threshold than the one they ultimately judge the accounts against.
In practice performance materiality is commonly set somewhere between 50% and 75% of overall materiality, with the lower end used where the auditor expects more errors, the control environment is weak, or this is the first year of the engagement. It is a judgement recorded in the audit file, not a formula applied mechanically.
The consequence for a finance team is entirely practical. A lower performance materiality means smaller sample sizes are insufficient, more items get selected for testing, and more questions arrive about balances the team considered trivial.
Two related thresholds complete the picture. Auditors also set a clearly trivial threshold, often around 5% of overall materiality, below which misstatements are not even accumulated, and they may set lower materiality for specific areas such as directors' remuneration where users are sensitive to small amounts.
In practice
Real-world examples.
Example
An audit team lowers performance materiality from 75% to 50% of overall materiality after finding weaknesses in the client's purchase approval controls. The finance team notices immediately, because the sample of purchase invoices requested jumps from 25 items to 60.
Example
A group auditor allocates component materiality to four subsidiaries, setting each subsidiary's performance materiality well below the group figure so that errors in several components cannot combine into a group-level misstatement. The largest subsidiary receives a threshold of $340,000 against a group overall materiality of $1,200,000.
Example
A first-year audit of a fast-growing technology company uses a lower buffer than normal because the auditor has no history of the client's error rate. The engagement partner documents the reasoning, noting that the threshold can rise in later years if the first audit finds few adjustments.
Think of it
“Performance materiality is the working threshold-lower than overall to provide cushion.
Formula
Calculation
Overall Materiality = Benchmark x Percentage
Performance Materiality = Overall Materiality x Buffer Percentage
A distribution company reports annual revenue of $80,000,000. The audit team selects revenue as the benchmark and applies 1%, giving overall materiality of $80,000,000 x 1% = $800,000. Because this is the second year of the engagement and controls tested well last time, the team sets performance materiality at 75% of that figure: $800,000 x 75% = $600,000.
The clearly trivial threshold is set at 5% of overall materiality, which is $800,000 x 5% = $40,000. In practice this means the auditors design testing to detect misstatements above $600,000 in any given area, ignore individual differences below $40,000 entirely, and accumulate everything in between to check whether the total approaches the $800,000 overall figure.Case study
Seen in the real world.
Bellhaven Components is a fictional manufacturer used here as an illustrative example. Its auditors set overall materiality at $800,000 based on 1% of revenue and performance materiality at $600,000, which is 75% of that figure, on the basis that prior audits had produced almost no adjustments.
During the year the company implemented a new inventory system, and testing turned up a series of small valuation errors in different product categories, none larger than $180,000. Individually every one of them sat below performance materiality, but accumulated they came to $740,000, uncomfortably close to overall materiality.
In this illustrative scenario the auditors extended their testing, found a further $210,000 of errors, and required an adjustment to the accounts. The point the fictional finance director took from it was that performance materiality is not a licence to ignore anything smaller than the threshold; it is the mechanism designed to stop exactly that assumption from causing a problem.
Watch out
Common mistakes.
- Treating performance materiality as the level at which an error becomes worth correcting, when its purpose is to guide testing rather than to define acceptable error.
- Assuming the threshold is fixed for the whole audit, when it can be set lower for specific balances such as related party transactions.
- Arguing that individual errors are immaterial without considering that auditors accumulate them and judge the total against overall materiality.
Questions
People also ask.
Why is performance materiality lower than overall materiality?
Because sampling means some errors go undetected, and the gap between the two creates a margin so that undetected and uncorrected errors together stay below the overall figure.
Who sets performance materiality?
The audit team, using professional judgement and the firm's methodology, and the reasoning must be documented in the audit file rather than negotiated with the client.
Does a lower threshold mean the auditor distrusts management?
Not necessarily, since it often reflects a first-year engagement, a system change or a genuinely higher expected error rate rather than any concern about honesty.
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