August 6, 2026

How to Set Performance Materiality Without Defaulting to 75%

Amanda Waldmann

Increasing trust with AI for audit and advisory firms.

Key insights

75% shows up in most files as a performance materiality percentage, and most of the time it's a convention carried forward rather than a risk judgment tied to the current engagement.
The percentage drives sample sizes, multi-location scoping, and the clearly trivial threshold, so a defaulted number can misprice large parts of the engagement.
The PCAOB's 2025 priorities Spotlight puts materiality changes and multi-location scoping in inspection focus.

Ask ten audit seniors what performance materiality percentage they used last busy season and most will say 75%, often without a risk rationale that survives a second question. The number matters because it determines sample sizes, which business units get full-scope procedures, and the floor below which misstatements aren't even accumulated. This article covers why the working threshold sits below overall materiality, how firms pick the percentage, and what the number drives once fieldwork starts.

Small misstatements stack, so the working threshold sits lower

The problem starts with the math. Overall materiality is the size of misstatement that could reasonably influence a user of the financial statements. It gets set at planning and it anchors the whole audit. But an audit plan built only to catch individually material misstatements has a gap: several smaller misstatements, each below overall materiality on its own, can still add up to a material amount in aggregate. The financial statements can be materially misstated even though no single error crossed the planning line.

That is the exposure performance materiality is designed to cover. It sits below overall materiality to reduce the probability that uncorrected and undetected misstatements together exceed the number that matters to users. "Uncorrected" means misstatements the team identified and the client didn't book. "Undetected" means the ones the audit never surfaced, because every audit tests less than 100% of a population and sampling risk never goes to zero. Performance materiality gives the file a buffer against both at once.

One note on terminology. The international auditing standard uses the term "performance materiality." PCAOB standards call the same concept tolerable misstatement. AS 2105 carries the same core requirement: the working amount has to be less than materiality for the financial statements as a whole. That holds at the account level and at individual locations in a multi-location audit. Different label, same job.

Overall, performance, and specific materiality do three different jobs

Three levels of materiality show up in a planning memo, and conflating them is where memos go sideways. Each one answers a different question.

Overall materiality answers a user question: what size misstatement could reasonably influence the decisions of someone relying on the financial statements as a whole? It gets expressed as a specified amount at planning and usually sits at 5% to 10% of income before taxes for a profit-oriented entity.
Performance materiality answers an auditor question: given what the team knows about this entity and what misstatements they expect, how much headroom do we need so the audit doesn't blow through overall materiality on aggregation alone? It is risk-driven and belongs entirely to the engagement team.
Specific materiality is a user question again, but pointed at a particular line. Some accounts and disclosures matter to users at amounts well below overall materiality. The standard's own examples point auditors toward related party transactions and management remuneration, among other line-specific disclosures. Where a specific level applies, performance materiality gets applied to it too. The working threshold is always set below whichever materiality level governs.

One more thing worth naming, because it's where new managers sometimes get tripped up: performance materiality is not an immateriality cutoff. At wrap-up, auditors still evaluate uncorrected misstatements on their facts. An intentional misstatement or an illegal payment can be material at a fraction of the threshold. Size gets you into the analysis; qualitative factors decide where the analysis ends.

How firms pick the percentage, and why 75% keeps showing up

With the three levels straight, the practical question is: how far below overall materiality should performance materiality sit? The answer that shows up in most files is 75%. The reason it shows up so often is a mix of good logic and inertia, and it's worth understanding both before deciding whether it fits the engagement in front of you.

The tradeoff: capacity against confidence

Higher percentages (say 75%) mean a larger working threshold. The audit tests against a bigger number, samples are smaller, hours come down, and the budget breathes. Lower percentages (50%) mean a smaller working threshold. Samples grow, more locations fall into scope, and the audit does more work per account. The tradeoff is capacity against confidence: the higher the percentage, the less room the file leaves for uncorrected and undetected misstatements before overall materiality is breached.

Why 75% clusters

75% sits at the top of most firms' standard scales because it fits the profile of the average recurring audit: a client the firm has worked with for years, controls that have tested effective, and few adjustments in prior periods. On that profile, a higher percentage is defensible. The market data reflects this. Neither international auditing standards nor PCAOB materiality guidance prescribe a percentage, but the conventions are remarkably consistent. In UK auditor reports, 75% of overall materiality or greater was the most common performance materiality figure across all market segments and firms. In Irish public-interest audits, 75% was used in more than half of instances. The full spread ran from 50% to 90%.

Firm methodologies formalize that spread on a graded scale, usually 50%, 65%, and 75%. The scale is meant to force a risk judgment: engagements with elevated risks, control deficiencies, and a history of misstatements land at the bottom, where 50% is the minimum. On public company work, major public accounting firms' internal guidance sets tolerable misstatement at 70% to 90% of overall materiality based on overall audit risk. The ranges are wide because the underlying judgment is supposed to move.

What a default costs

For a reviewer, the uncomfortable read of the clustering at 75% is that the judgment often doesn't move. It looks less like independent risk assessments converging on the same answer and more like the default nobody had a reason to change.

The drawbacks cut both ways. Run 75% on a first-year engagement with shaky controls and a history of adjustments, and the buffer may be too thin. The team is likely to find more misstatements than the working threshold anticipated, aggregation gets uncomfortable, and the wrap-up phase turns into a scramble. Carry 50% forward on a stable client with clean prior years and effective controls, and the audit buys sample sizes nobody needed. Hours climb, realization suffers, and the file signals overcaution rather than judgment. Either way, the percentage is doing more work than the documentation supports.

Risk moves the percentage; industry moves the benchmark

If a firm wants the number to move off 75% for the right reasons, two inputs need to work correctly, and they operate at different points in the calculation. Get either one wrong and the working threshold is off before fieldwork begins.

The risk factors that move the percentage

In the typical range, higher assessed risk supports a lower percentage. The standards point to two main drivers: the auditor's understanding of the entity, updated through risk assessment, and the nature and extent of misstatements found in prior audits. In practice, the number tends to move down when control reliability is weaker, fraud risk indicators are present, management or the accounting function has turned over, or the engagement is in its first year.

The evidence that carries the argument in the file is usually adjusted and unadjusted misstatements from prior periods and current control deficiencies, with other prior-period facts added when they bear on what the team expects to find this year.

The industry factors that move the benchmark

Before the percentage ever applies, industry drives which benchmark makes sense for overall materiality. The wrong benchmark makes a technically correct percentage produce a threshold nobody should rely on.

For profit-oriented entities, common practice runs at 5% to 10% of income before taxes. Real estate companies often use 1% of the greater of total assets or revenue, since asset values typically dwarf revenue on recently acquired properties. Nonprofits break the model entirely: net income rules of thumb do not translate, so auditors apply percentages to total assets, total revenues, or another measure of the organization's size. Loss-making and early-stage companies push teams toward adjusted income or asset benchmarks for the same reason: the "normal" benchmark produces a number that isn't usable.

Benchmark choice has real downstream consequences. Pick a volatile benchmark on a short reporting period and overall materiality can halve against a balance sheet that hasn't moved. Performance materiality moves with it, and so does every threshold below.

What the number drives once fieldwork starts

Performance materiality is the last planning decision that behaves like a planning decision. Everything after it is execution, and the number is embedded in three places worth understanding: sample sizes, scope, and the floor for accumulating misstatements.

Sample sizes and scope

When performance materiality feeds a sampling procedure, it becomes tolerable misstatement, the amount of error the team is willing to accept in a tested account without concluding it's materially misstated. PCAOB sampling guidance generally pushes the sampled-population amount lower again, leaving room for misstatement in the untested remainder of the account.

The mechanics from there are straightforward. Lower performance materiality means less acceptable misstatement per test, which means larger samples, which means more hours in affected testing areas. Multi-location scoping rides on the same number: tolerable misstatement at each location has to sit below financial statement materiality, and that comparison is what determines which business units get full-scope procedures and which get analytics.

The clearly trivial floor

At the bottom of the cascade sits the clearly trivial threshold, the amount below which misstatements aren't even accumulated on the summary of unadjusted differences. PCAOB evaluation guidance distinguishes clearly trivial from immaterial. It is a smaller order of magnitude altogether, and when there is any doubt about whether an item qualifies, it doesn't.

The standards put no percentage on it. The single-digit conventions that circulate in practice (often 3% to 5% of overall materiality) are exactly that, conventions. That's why the documented rationale carries more weight than the number itself.

What inspectors look at

The regulatory context matters because materiality judgments face current inspection pressure. The December 2024 PCAOB inspection priorities point to three things inspectors are watching: whether teams raise materiality to reduce hours, how they support significant year-over-year materiality changes, and whether multi-location scoping follows the risk evidence rather than the budget.

The same documentation problem shows up after fieldwork. The EQR Spotlight (the PCAOB's review of engagement quality reviews) described files that lacked evidence the quality reviewer had evaluated materiality judgments and their effect on engagement strategy. That finding sits against a backdrop where firms with at least one EQR deficiency climbed from 37% in 2020 to 42% in 2022. The exposure is as much documentation as judgment: a percentage with no written link to the risk factors reads as a habit, not a decision.

There's a practical execution problem in the cascade too. When materiality gets revised mid-audit (a common occurrence as risk assessment sharpens), dependent thresholds move across sampling workpapers, location scoping, and the misstatement summary. Teams running disconnected files rebuild that chain by hand. On an end-to-end platform like Fieldguide, the trial balance stays in one place with risk-based sampling assistance and testing workpapers, so threshold updates and related workpapers stay aligned.

Keeping the materiality cascade consistent with Fieldguide

Audit teams have to keep one performance materiality number consistent across many workpapers, with reasoning clear enough for EQR review. Fieldguide gives audit and advisory teams an end-to-end AI-native platform purpose-built for audit and advisory work, with an Agent Workforce that runs alongside practitioners on every engagement. Field Auditor validates uploaded evidence the moment it arrives and executes supported test procedures across the file; practitioners review the output and own the judgment calls that materiality demands, from the percentage itself to the evaluation of accumulated misstatements. That structure keeps threshold changes connected to testing and misstatement evaluation instead of scattering them across spreadsheets and email. Half the top 100 firms use Fieldguide, including KPMG, BDO, RSM, Baker Tilly, Grant Thornton, and Forvis Mazars. Request a demo to see how the materiality cascade holds together on one platform.