Audit and Assurance · Objective and general principles

Professional Scepticism and Professional Judgement in Audit

Updated 11 October 2026 · Fact-checked

Professional scepticism is an attitude of a questioning mind, alertness to conditions that may indicate misstatement, and critical assessment of audit evidence. Professional judgement is applying relevant training, knowledge and experience to make informed decisions. ISA 200 requires auditors to apply both throughout the planning and performance of the audit.

Understand Professional Scepticism and Professional Judgement

Professional scepticism is an attitude. ISA 200 describes it as including a questioning mind, being alert to conditions that may indicate possible misstatement due to error or fraud, and a critical assessment of audit evidence. You do not assume management is dishonest. You also do not assume it is honest. You ask for evidence.

Why does it matter? The auditor gives an opinion on whether the financial statements are free from material misstatement. Management prepares those statements and may have reasons to present them in a favourable way, for example bonuses or loan covenants. Without scepticism, the auditor might accept weak explanations and miss errors or fraud.

Professional judgement is different. It is the application of training, knowledge and experience, within the context of auditing, accounting and ethical standards, to reach informed decisions about the right course of action. It is a skill you use in decisions such as setting materiality, assessing risk, deciding how much evidence is enough, evaluating accounting estimates and choosing the type of audit opinion.

The two work together. Scepticism is the mindset that makes you challenge. Judgement is how you decide what to do after you have challenged. Scepticism without judgement leads to over-testing everything. Judgement without scepticism leads to decisions built on unchallenged information.

Both must be used throughout the audit, and the auditor should document significant judgements so that an experienced reviewer can understand them. Scepticism is needed most where there is judgement or estimation, where management is under pressure, where there are inconsistencies in evidence, or where information looks unreliable. Judgement cannot be used to justify decisions that are not supported by the facts and evidence.

Key rules to remember

Professional scepticism (ISA 200): Questioning mind + alertness to possible misstatement + critical assessment of evidence; It is an attitude. Maintain it throughout the audit, including when the client is long-standing and trusted.
Professional judgement (ISA 200): Training + knowledge + experience, applied within auditing, accounting and ethical standards → informed decisions; It is needed for materiality, risk assessment, evidence sufficiency, estimates and the opinion.
Auditor's duty: Plan and perform the audit with professional scepticism, recognising that material misstatement may exist; This applies even if the auditor has past experience of management's honesty and integrity.
Documentation of judgement: Significant judgements and their basis → recorded in working papers; An experienced auditor with no prior connection should be able to understand them.

How to solve Professional Scepticism and Professional Judgement questions

Use this method for scenario questions asking you to identify where scepticism or judgement is needed, or to explain why it matters.

1Read the scenario and underline anything unusual: pressure on management, vague explanations, inconsistent evidence, estimates, late or missing documents, rapid growth or reliance on one person.
2Decide which concept is being tested: the questioning attitude (scepticism) or a decision requiring experience (judgement). Say which one you are using.
3State the relevant point from ISA 200 briefly, for example a questioning mind or critical assessment of evidence.
4Link it to the facts: explain what the auditor should do, such as obtain corroborating evidence, challenge management, or extend testing.
5Explain the risk if scepticism is not applied, such as accepting a biased estimate or missing fraud.
6Where judgement is needed, name the decision (materiality, risk, sufficiency of evidence, opinion) and say it must be documented.
7Conclude with a clear action or recommendation. Make one point per mark available.

Quickest way: Fact – Concept – Action

When to use it: Use in Section A/B objective questions and when time is short in a written part.

Fact: pick out the red flag or the decision in the scenario.
Concept: scepticism if it is about challenging or doubting evidence; judgement if it is about choosing, estimating or deciding.
Action: write what the auditor does next, such as obtain independent evidence.
For objective questions, reject options that say the auditor should assume management is honest or dishonest, or that scepticism can be dropped for a long-standing client.

Common mistakes in Professional Scepticism and Professional Judgement

Saying professional scepticism means assuming management is dishonest.
Students link scepticism with suspicion of fraud.
Fix: State that the auditor neither assumes honesty nor dishonesty. The auditor keeps a questioning mind and evaluates evidence critically.
Treating scepticism and judgement as the same thing.
Both appear together in ISA 200 and both sound like mindset.
Fix: Scepticism is an attitude of questioning. Judgement is applying knowledge and experience to make decisions. Define each separately, then link them.
Relaxing scepticism because the client is long-standing and trusted.
Past audits were clean, so students assume this one will be too.
Fix: Past experience does not remove the need for scepticism. Material misstatement may still exist.
Giving a generic definition without applying it to the scenario.
Students learn the definition and stop there.
Fix: Tie each point to a fact in the question and say what the auditor should do about it.
Forgetting to say judgements must be documented.
Students focus on making the decision, not on recording it.
Fix: Add that significant judgements and their basis are recorded in the working papers.

Worked examples

Example 1

During the audit of a trading company, the finance director tells the auditor that a large receivable overdue by eight months will definitely be paid, and offers an email from the customer saying so. The audit senior is inclined to accept this. Explain how professional scepticism applies and what the auditor should do.

Show the solution

Fact: a large, long-overdue receivable is supported only by management's assertion and a customer email.
Concept: professional scepticism requires a questioning mind and critical assessment of evidence. An email forwarded by management is weaker evidence than evidence obtained directly by the auditor.
Action: the auditor should seek independent evidence, for example a receivables confirmation sent directly to the customer, or post year-end cash receipts.
Also review the customer's payment history and any disputes, and consider whether an allowance for credit losses is needed.
Risk if scepticism is not applied: receivables and profit may be overstated.
Judgement point: the auditor must judge whether the evidence obtained is sufficient and appropriate and document that conclusion.

Answer: The auditor should not accept management's assurance or the forwarded email at face value. Professional scepticism requires corroboration from independent sources, such as a direct confirmation or subsequent receipts, and a considered judgement on whether an allowance is required, documented in the working papers.

Example 2

Explain the difference between professional scepticism and professional judgement, and give one example of each in an audit of inventory.

Show the solution

Define scepticism: an attitude including a questioning mind, alertness to possible misstatement and critical assessment of audit evidence.
Define judgement: applying relevant training, knowledge and experience, within auditing, accounting and ethical standards, to reach informed decisions.
Example of scepticism: at the inventory count, the auditor notices that some boxes are labelled as finished goods but look old and dusty. The auditor questions this and examines the condition and sales history rather than accepting management's count sheets.
Example of judgement: the auditor decides how many inventory lines to test and whether the net realisable value estimate for slow-moving items is reasonable, based on risk and experience.
Link: scepticism prompts the challenge; judgement determines the response and the conclusion. Significant judgements should be documented.

Answer: Professional scepticism is the questioning attitude and critical assessment of evidence. Professional judgement is the informed decision-making using knowledge and experience. Questioning the condition of dusty inventory is scepticism. Deciding the extent of testing and whether the NRV estimate is reasonable is judgement.

Exam tips

Define both terms using ISA 200 ideas, but always apply them to the scenario for the marks.
In objective questions, wrong options often say scepticism means assuming dishonesty or that it can be reduced for trusted clients.
Look for red flags: management pressure, estimates, late documents, unusual transactions and evidence that conflicts.
In written answers, finish with a specific audit action, such as obtaining independent corroboration, not just a statement that scepticism is needed.
Mention documentation of significant judgements when the question asks about judgement.

Professional Scepticism and Professional Judgement: frequently asked questions

What is professional scepticism in audit under ISA 200?

It is an attitude that includes a questioning mind, alertness to conditions that may indicate misstatement due to error or fraud, and a critical assessment of audit evidence. The auditor applies it throughout the audit.

What is the difference between professional scepticism and professional judgement?

Scepticism is the questioning attitude you bring to evidence. Judgement is the application of your training, knowledge and experience to make decisions, such as on materiality or risk. Scepticism prompts the challenge and judgement decides the response.

Why is professional scepticism important in audit?

Management prepares the financial statements and may be biased or under pressure. Scepticism helps the auditor spot misstatements from error or fraud and avoid accepting weak evidence. It supports a reliable audit opinion.

Does scepticism mean the auditor should not trust management?

No. The auditor does not assume management is either honest or dishonest. The auditor asks for sufficient appropriate evidence and evaluates it critically, even where management has been reliable in the past.