Is 5% of profit before tax required for audit materiality?

No. Five percent of profit before tax is an illustrative starting point for some profit-oriented entities, not a percentage required by ISA (UK) 320.

What happens when profit before tax is a loss or is unrepresentative?

The simplified calculator does not turn a loss into a positive benchmark or normalise profit automatically. It can show revenue or net assets as an alternative entered benchmark.

Does a clearly trivial threshold mean an item is not material?

No. Clearly trivial is not another expression for not material. Smaller matters may still require consideration because of their nature or circumstances.

Simplified Audit Materiality Calculator

Enter a few key figures to estimate overall audit materiality, performance materiality and a clearly trivial threshold using common UK audit starting points.

Need a more detailed benchmark and risk assessment?Use the Advanced Audit Materiality Calculator →

Indicative starting point: This simplified calculator does not determine a required materiality amount or replace the auditor's judgement, firm methodology, consultation and documentation.

Enter the key details

Three figures and two short judgements are enough for a simplified starting point.

1. Entity profile

What best describes the entity?

2. Financial figures

Profit before tax

Enter a positive amount, zero or a loss using a minus sign.

Revenue

Required. Enter a positive current-year revenue amount.

Net assets / equity

Optional unless an asset-focused profile is selected.

3. Key judgements

Is current-year profit before tax broadly representative of normal performance?

Aggregation risk / expected misstatement level

Higher may fit a first-year audit, previous errors, weak controls or higher expected misstatements. Lower may fit strong controls, a clean prior history and low expected misstatement risk.

Privacy: All financial calculations stay in this browser. The figures are not submitted, saved in browser storage or included in analytics.

Suggested starting point

Your simplified materiality estimate

Benchmark

Percentage

Performance materiality percentage

Clearly trivial percentage

Performance-materiality percentages are illustrative starting points informed by published audit practice, not percentages required by ISA (UK) 320.

Overall materialityNot calculatedNot calculated

Performance materialityNot calculatedNot calculated

Clearly trivialNot calculatedNot calculated

Compare other benchmarks

Benchmark	Amount	Illustrative %	Indicative materiality

Quantitative materiality is only a starting point. Smaller matters may still be material because of their nature or circumstances. Review qualitative factors in the Advanced calculator →

Need a more detailed assessment?

The Advanced Audit Materiality Calculator considers users of the accounts, benchmark suitability, volatile profits, first-year audits, controls, previous misstatements, specific materiality and planning/final reassessment.

Open Advanced Materiality Calculator →

How it works

A fast, transparent starting point

The Simplified calculator keeps the inputs short while retaining the same methodology source as the Advanced calculator.

Suggests, never requires

The entity profile and PBT assessment help suggest a benchmark. You can switch between every usable amount entered.

Does not invent profit

A loss is never turned positive and unusual PBT is not silently normalised. Revenue or net assets may provide an alternative cross-check.

Keeps judgement visible

The displayed percentages are editable illustrative starting points. Engagement facts and the firm's methodology remain decisive.

Technical context

Standards and published practice

ISA requirements are authoritative. FRC thematic and Sandbox material provides context and is not a regulatory percentage table.

ISA (UK) 320Materiality in planning and performing an audit.ISA (UK) 450Evaluation and accumulation of identified misstatements.FRC Materiality Thematic ReviewObserved market practice and audit-quality findings from 2017.FRC SME Materiality SandboxJune 2026 exploratory material for SME audits. It does not represent official FRC guidance or prescribe a mandatory methodology.

FAQs

Simplified audit materiality questions

Is 5% of PBT required?

No. ISA (UK) 320 gives 5% of PBT as an example in one profit-oriented fact pattern. The benchmark and percentage require professional judgement.

What happens if PBT is a loss or is not representative?

The calculator does not convert a loss to a positive number or normalise profit automatically. It can suggest revenue or an entered net-assets amount as an alternative simplified starting point.

Why are performance-materiality percentages editable?

ISA (UK) 320 does not prescribe a fixed percentage. The 50%, 65% and 75% simplified settings are illustrative points linked to higher, moderate and lower aggregation-risk profiles, and custom values remain available.

Is 5% clearly trivial mandatory?

No. ISA (UK) 450 does not require 5%. Clearly trivial is not another expression for not material, and nature or circumstances can require smaller matters to be accumulated.