How to Calculate Materiality for Different Industries

The biggest practice gap in materiality (mat) isn’t the benchmark percentage. It’s that firms pick one benchmark at planning and never revisit it when they learn how different that manufacturing client is from last year’s retail audit. SALY with a methodology shield: the prior-year (PY) file used 5% of profit before tax (PBT) so this year does too, and nobody opens the analytical review to check whether PBT still moves with the economics of the business.

To calculate mat under ISA 320 for a specific industry, select the benchmark most relevant to the entity’s users ( ISA 320 .A4), apply a percentage from the accepted range for that industry, adjust for qualitative factors under ISA 320 .A3, then set performance materiality (PM) under ISA 320.11 .

Key takeaways

How to select the right benchmark for the entity type (profit-based, revenue-based, asset-based, or expense-based) using ISA 320 .A4 criteria
What percentage ranges are accepted for each benchmark across different industries, and why the range matters more than the midpoint
How to make and document the qualitative adjustment that moves you within the range for a specific client
How to set performance materiality and trivial misstatement thresholds that are defensible at review

What ISA 320 requires you to decide

ISA 320.10 requires the auditor to determine mat for the financial statements (FS) as a whole. This is overall mat. ISA 320.11 requires the auditor to determine PM, which is set lower than overall mat to reduce the probability that the aggregate of uncorrected and undetected misstatements exceeds overall mat.

Two separate decisions with two separate rationales. The working paper (WP) must document both.

ISA 320.10 also requires the auditor to consider whether there are particular classes of transactions, account balances or disclosures for which misstatements of lesser amounts than overall mat could reasonably be expected to influence economic decisions. If yes, the auditor sets a lower mat level for those items. ISA 320 .A10 gives the example of related party transactions or director remuneration, where users are sensitive to amounts well below overall mat.

The standard does not prescribe benchmarks or percentages. ISA 320 .A4 lists factors the auditor considers when identifying an appropriate benchmark: the elements of the FS, whether there are items users tend to focus on, the nature of the entity, the entity’s ownership structure, and how the entity is financed. ISA 320 .A7 provides common benchmarks (PBT, total revenue, gross profit, total expenses, total equity, net asset value) without prescribing which to use.

This deliberate ambiguity means the auditor’s judgment is the product. The file should tell a story. The WP must show why you chose the benchmark you chose, why you applied the percentage you applied, and why you adjusted (or didn’t adjust) for qualitative factors. A mat memo that records only the calculation without the reasoning fails ISA 320 on documentation grounds alone.

Selecting the benchmark: which financial measure for which industry

The benchmark should be the financial measure most relevant to the users of the FS. This varies by industry and entity type. The following framework covers the most common engagements at mid-tier firms.

PBT is the default benchmark for commercial entities where the primary users are equity investors or lenders focused on earnings capacity. It works well for manufacturing, wholesale, retail, professional services, and technology companies that are profitable and have stable earnings. ISA 320 .A4 identifies PBT as a common benchmark for profit-oriented entities. The range is typically 5% to 10%.

The limitation of PBT is volatility. If profit fluctuates substantially between years (a construction company with large project timing differences, a seasonal retailer, a startup), the benchmark produces unstable mat. A reviewer who sees mat double or halve year-on-year because profit moved will question whether the benchmark is appropriate.

Revenue is the standard alternative when profit is volatile or negative. Not-for-profit entities, loss-making entities, early-stage companies, and entities where the user base focuses on scale rather than profitability all fit here. Revenue is also the preferred benchmark for entities in industries where top-line growth is the primary performance indicator: SaaS companies, media, telecommunications, and platform businesses. The range is typically 0.5% to 2%.

Total assets works for entities where the balance sheet is the primary financial statement. Banks, insurance companies, real estate holding companies, and investment vehicles all have users focused on the asset base rather than earnings or revenue. For financial institutions, ISA 320 .A4’s reference to “how the entity is financed” points toward an asset-based benchmark. The range is typically 0.5% to 2% of total assets, though for banks the PCAOB and European regulators have accepted ranges as low as 0.25% to 1% of total equity.

Total expenses fits entities funded primarily by grants, subsidies or allocated budgets, where the accountability question is about how funds were spent. Government-funded healthcare institutions and charities fall here. The range is typically 0.5% to 2%.

Gross profit is useful for entities with a thin margin between revenue and cost of sales where PBT is too volatile but revenue is too large. Distribution companies, commodity traders, low-margin retailers, and agricultural cooperatives sometimes justify gross profit as the benchmark that best reflects the entity’s operational performance from the users’ perspective. The range is typically 1% to 5%.

The critical point is that you choose one benchmark and state why. If the entity type makes the choice obvious (a profitable manufacturer with stable earnings uses PBT), the rationale can be one sentence. If the entity is unusual (a loss-making healthcare provider funded partly by insurance reimbursement and partly by municipal subsidy), the rationale needs to address why you rejected the more common alternatives.

Percentage ranges by benchmark and industry type

The ranges below represent established practice across European firm methodologies. They are not prescribed by ISA 320 , which deliberately avoids numbers. They represent the range within which a qualified auditor’s judgment is unlikely to be challenged on review. In our experience, going outside these ranges requires explicit justification.

Benchmark	Typical range	Common industries
Profit before tax	5% to 10%	Manufacturing, wholesale, retail, professional services, technology (profitable)
Revenue	0.5% to 2%	Not-for-profit, loss-making entities, SaaS, telecom, media, early-stage companies
Total assets	0.5% to 2%	Real estate holding, investment vehicles, banks (lower end), insurance
Total expenses	0.5% to 2%	Healthcare (publicly funded), education, charities, government-funded bodies
Gross profit	1% to 5%	Distribution, commodity trading, low-margin retail

Within each range, the position you choose depends on qualitative factors (covered in the next section). The midpoint is not the safe choice. It’s the choice that implies you didn’t consider the factors. A reviewer expects to see a documented reason for choosing the upper or lower portion of the range.

For listed entities (PIEs), practice tends toward the lower end of any range. Regulatory scrutiny from APAS, the FRC or the AFM increases the risk that a mat level at the top of the range will be challenged during inspection. For owner-managed SMEs where the shareholders are also the directors and the primary users are the tax authorities and the bank, the upper end of the range is more commonly accepted.

The qualitative adjustment: moving within the range

ISA 320 .A3 identifies factors that may affect the identification of an appropriate benchmark and the determination of mat. These are the qualitative factors that move you within the percentage range. The WP should identify which factors apply and state the direction (higher or lower) and magnitude of the adjustment.

Factors that push mat down within the range include PIE status or heightened regulatory scrutiny, public listing, known going concern indicators (where users will scrutinise numbers more closely), related party transactions of material amounts, material PY audit adjustments, weak internal controls over financial reporting, and operating in a regulated industry (financial services, healthcare, utilities, and energy) where reporting accuracy has direct regulatory consequences.

Factors that push mat up within the range include owner-management with a narrow user base, a simple corporate structure with few estimates, strong internal controls with few or no PY misstatements, FS used primarily for tax compliance rather than investment decisions, and low regulatory sensitivity in the entity’s industry.

The adjustment is not arithmetic. You don’t add 0.5% for each factor. You make a judgment call, weighted by relevance, and record it. A strong qualitative adjustment section in the mat memo might read: “Revenue benchmark applied at 1.2% (lower half of the 0.5%–2% range) because (1) the entity’s bank covenant requires audited FS and the bank has previously queried misstatements above €50,000, and (2) the entity’s construction contracts include progress billing estimates that carry inherent measurement uncertainty.” That’s two specific factors, a stated direction, plus a point within the range. That’s what a reviewer needs.

Setting performance materiality under ISA 320.11

PM is not a fixed percentage of overall mat. ISA 320 .A12 states that the determination involves professional judgment and is affected by the auditor’s understanding of the entity, including the nature and extent of misstatements identified in previous audits. Setting PM at 75% is the FRC’s single most-cited documentation failure, and also the single most ignored after the partner meeting.

At firms like ours, PM typically lands between 50% and 75% of overall mat. The position within that range depends on the same qualitative factors that drive benchmark selection, plus one additional input: the auditor’s expectation of misstatements in the current period.

If PY audits found few misstatements and the entity’s control environment is stable, PM toward 75% of overall mat is defensible. If PY audits found many misstatements (even if individually below mat), or if the entity has undergone substantial changes (new ERP system, restructuring, new revenue streams, or acquisitions), PM toward 50% is more appropriate.

Document the percentage chosen and the reason. “PM set at 60% of overall mat (€102,000 of €170,000) because PY testing identified eight uncorrected misstatements totalling €31,000, indicating a moderate expectation of misstatements in the current period.” That’s defensible. “PM set at 60%” without reasoning is not.

Trivial misstatement (the threshold below which misstatements are clearly trivial under ISA 450 .A2) is typically set at 3% to 5% of overall mat. This is the posting threshold for the summary of unadjusted differences. Misstatements below this amount do not need to be accumulated unless they are qualitatively meaningful.

Worked example: materiality for Vermeer Zorg B.V. (healthcare)

Client scenario: Vermeer Zorg B.V. is a home healthcare provider based in Utrecht. Revenue is €18.4M, of which approximately 70% comes from health insurer reimbursements and 30% from municipal (gemeente) funding for social support services. The entity reports a PBT of €380,000 (a 2.1% margin). Total expenses are €18.0M. The entity has 240 employees. The PY audit identified four uncorrected misstatements totalling €22,000.

1. Select the benchmark.

PBT would give a mat range of €19,000 to €38,000 (5%–10% of €380,000). This is far too low relative to the entity’s scale and would result in a sample size that makes the engagement economically unviable. The thin margin makes PBT an unstable benchmark. A €50,000 swing in reimbursement timing would halve the profit.

Revenue is a possibility, but Vermeer Zorg is not a growth-oriented entity. Its users (health insurers and the gemeente) are focused on whether funds were spent appropriately, not on top-line scale.

Total expenses (€18.0M) is the most relevant benchmark. The primary users are the health insurers and the municipal funders, both of whom focus on whether expenditure was incurred for the contracted purpose. ISA 320 .A4’s reference to “items on which particular users tend to focus their attention” points directly to the expenditure base.

Documentation note: state the benchmark (total expenses, €18,000,000), the alternatives considered and rejected (PBT rejected for instability, revenue rejected because users focus on expenditure), and the ISA 320 .A4 criteria applied.

2. Apply the percentage.

The range for total expenses is 0.5% to 2%. The entity operates in a regulated industry (healthcare), is subject to reimbursement audits by the health insurers, and has a moderate history of misstatements (four items totalling €22,000 in the prior year). These factors push toward the lower half of the range.

Overall mat: 1% of €18,000,000 = €180,000.

Documentation note: record the percentage (1%), the qualitative factors that determined the position within the range (regulated industry, insurer reimbursement scrutiny, moderate PY misstatements), and the resulting mat figure (€180,000).

3. Set performance materiality.

PY misstatements were moderate (€22,000 aggregate on four items). No system changes occurred. PM at 65% of overall mat: €117,000.

Documentation note: record the PM (€117,000, 65% of overall mat), the basis (moderate PY misstatements, stable control environment), and the cross-reference to the PY summary of unadjusted differences.

4. Set trivial misstatement threshold.

5% of overall mat: €9,000. Misstatements below €9,000 will not be accumulated unless qualitatively meaningful.

Documentation note: record the trivial misstatement threshold (€9,000) and the basis (5% of overall mat per firm policy).

Worked example: materiality for Schwarz Logistik GmbH (logistics)

Client scenario: Schwarz Logistik GmbH is a mid-sized freight logistics company based in Hamburg with €62M in revenue. PBT is €4.1M (a 6.6% margin). Total assets are €28M. The entity is owner-managed by two shareholders who are also the Geschäftsführer. The primary FS users are the two owners and the financing bank (ING, with a term loan covenant requiring audited HGB FS). PY audit: one uncorrected misstatement of €8,000.

1. Select the benchmark.

PBT is stable (5.8% margin in the prior year, 6.6% this year) and the entity is a commercial, profit-oriented GmbH. The primary users (owners plus financing bank) both focus on profitability. PBT is the appropriate benchmark.

Documentation note: state the benchmark (PBT, €4,100,000), note that PBT is stable year-on-year, and confirm the primary users.

2. Apply the percentage.

The range for PBT is 5% to 10%. Factors pushing up: owner-managed entity with a narrow user base (two shareholders plus one bank), simple corporate structure (no subsidiaries, no group), PY audit was clean (one uncorrected misstatement of €8,000). Factors pushing down: the ING loan covenant specifically requires audited FS, and the bank has historically queried adjustments.

Position: 7.5% (upper-middle of the range, reflecting the narrow user base offset by the bank covenant sensitivity).

Overall mat: 7.5% of €4,100,000 = €307,500.

Documentation note: record the percentage (7.5%), the upward factors (owner-managed, simple structure, clean prior year), the downward factor (bank covenant sensitivity), and the resulting mat (€307,500).

3. Set performance materiality.

PY audit found one misstatement of €8,000. Control environment is stable. PM at 75%: €230,625. Round to €230,000 for practical purposes.

Documentation note: record PM (€230,000, approximately 75% of overall mat), the basis (clean prior year, stable controls), and note the rounding.

4. Set trivial misstatement threshold.

5% of overall mat: €15,375. Round to €15,000.

Documentation note: record the trivial misstatement threshold (€15,000) and the basis.

Practical checklist for your materiality memo

Identify the primary users of the FS before selecting a benchmark. ISA 320 .A4 anchors benchmark selection to the users, not to the entity type alone. Document who the users are (shareholders, bank, regulator, grant funder) in the opening sentence of the mat memo.
Select one benchmark with a documented rationale. If you considered alternatives before rejecting them, state them and explain why they were less appropriate. Reviewers flag mat memos that record a benchmark without explaining the choice.
Apply a percentage within the accepted range and document the qualitative factors that determined where within the range you landed. At minimum, name two factors and state the direction (upward or downward) of their effect.
Set PM as a percentage of overall mat (typically 50%–75%) with a stated reason. Cross-reference the PY summary of unadjusted differences. If no PY misstatements existed, say so. If misstatements existed, state their total and explain their effect on the current-year PM percentage. Don’t just roll it forward.
At completion, revisit mat under ISA 320.12 . If actual financial results differ materially from the planning-stage figures used to calculate mat, recalculate and assess the impact on audit procedures already performed. A reviewer who sees planning mat based on interim revenue of €55M and actual revenue of €62M will expect to find a completion-stage reassessment.
Record the trivial misstatement threshold and the percentage used. This is the ISA 450 .A2 “clearly trivial” threshold. If any misstatement below this amount is qualitatively meaningful (related party, fraud indicator, covenant breach, or regulatory filing error), document why it was accumulated despite falling below the threshold.

Common mistakes

The AFM has flagged mat calculations where the benchmark percentage is applied without any recorded qualitative adjustment. A memo that reads “5% of PBT = €X” is not a mat determination under ISA 320 . It’s a calculation. The determination requires judgment about where within the range to set the number and why. Recording no qualitative factors implies none were considered, which is a deficiency.
Firms that audit entities across different industries sometimes apply the same benchmark and percentage to every engagement. A 1% of revenue calculation works for a loss-making tech company but is too high for a €200M logistics firm with stable profits. ISA 320 .A4 requires the benchmark to be relevant to the specific entity’s users. Using a template default without client-specific assessment is the finding most commonly reported in quality review feedback.
Completion-stage mat revision under ISA 320.12 is frequently missing. If planning mat was set using forecast or interim figures and the actual results differ by more than 10%–15%, the auditor must reassess. The reassessment doesn’t always change the number, but the assessment itself must be documented. Missing it is a binary deficiency.

Glossary: performance materiality. Covers the definition, the relationship between overall materiality and performance materiality, and the ISA 320.11 requirement.
ISA 320 Materiality Calculator. Use this to calculate overall materiality, performance materiality, and trivial misstatement thresholds with inputs for benchmark, percentage, qualitative factors, and performance materiality ratio.
How to design an audit sampling plan. Your sampling plan’s tolerable misstatement input comes directly from the performance materiality set in your ISA 320 memo. This post shows how the two connect.

Related guides:

Put audit concepts into practice with these free tools:

Frequently asked questions

How do I choose the right materiality benchmark for a specific industry?

Select the benchmark most relevant to the entity's users under ISA 320 .A4. Profit before tax is the default for profitable commercial entities (manufacturing, retail, services). Revenue works when profit is volatile, near zero, or for growth-focused entities (SaaS, telecom). Total assets suits balance-sheet-focused entities (banks, real estate, investment vehicles). Total expenses fits grant-funded or publicly funded entities (healthcare, education, charities). The key is documenting why the chosen benchmark reflects what users focus on.

What percentage range should I use for materiality?

Typical ranges are: profit before tax 5–10%, revenue 0.5–2%, total assets 0.5–2%, total expenses 0.5–2%, and gross profit 1–5%. The position within the range depends on qualitative factors including PIE status, regulatory scrutiny, prior-year misstatements, control environment quality, and user base complexity. The midpoint is not the safe choice. It implies no qualitative factors were considered.

What qualitative factors move materiality up or down within the range?

Factors pushing materiality down include PIE status, public listing, going concern indicators, significant related party transactions, prior-year audit adjustments, weak internal controls, and operating in a regulated industry. Factors pushing materiality up include owner-management with a narrow user base, simple corporate structure, strong controls with few prior-year misstatements, and financial statements used primarily for tax compliance.

How should I set performance materiality under ISA 320.11 ?

Performance materiality is typically set at 50–75% of overall materiality. Use 60–75% where prior-year audits found few misstatements and the control environment is stable. Use 50–60% where prior-year audits found numerous misstatements, the entity has undergone significant changes, or it is a first-year engagement. Document the percentage and the reason, cross-referencing the prior-year summary of unadjusted differences.

Do I need to reassess materiality at completion?

Yes. ISA 320.12 requires revision if the auditor becomes aware of information that would have changed the initial determination. If planning materiality was set using forecast or interim figures and actual results differ by more than 10–15%, the auditor must reassess. The reassessment does not always change the number, but the assessment itself must be documented. Missing it is a binary deficiency.