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Fraud and the auditor (ISA 240)

ICAN Skills, Audit, Assurance and Forensics. Syllabus area A, process of audit and assurance

9 min read · Updated 6 November 2026

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In this part

A store manager creates a fictitious supplier, approves invoices to it for ₦15 million over two years and pays them into his own account. Nobody notices because the manager also approves the receipt of the goods. The directors are shocked and ask the auditors why they did not find it. The honest answer lies in what an audit promises.

The auditor must plan to find material misstatement, including from fraud, and must be alert to fraud. But the audit is not an investigation, and the duty to prevent and detect fraud rests with management.

This topic covers the definition of fraud, the responsibilities of management and the auditor under International Standard on Auditing (ISA) 240, the two types of fraud, procedures to assess fraud risk, risk factors, the response and reporting. A later group of topics covers forensic investigation in depth.

In 30 seconds

Fraud: an intentional act involving deception to gain an unjust or illegal advantage. Error: an unintentional mistake. Responsibility: management prevents and detects fraud; the auditor obtains reasonable assurance that the statements are free from material misstatement, whether from fraud or error. Two types: fraudulent financial reporting and misappropriation of assets. Risk factors: pressure or incentive, opportunity, attitude or rationalisation.

Response: ISA 330 procedures; report to management; consider a duty to report to authorities.

Key terms in plain English

TermWhat it means
FraudAn intentional act of deception to gain an unjust or illegal advantage
ErrorAn unintentional mistake
Management overrideManagement overruling controls to misstate figures
Misappropriation of assetsStealing or misusing the entity's assets
Fraud trianglePressure, opportunity and rationalisation
Fictitious supplierA supplier that does not exist, used to divert payments

Syllabus check

This topic is in syllabus area A, process of audit and assurance (20% of marks). It covers:

  • fraud and the auditor's responsibilities (ISA 240)
  • the assessment of the risk of material misstatement from fraud
  • the forensic accounting link

CAMA 2020 and fraud

The Companies and Allied Matters Act 2020 (CAMA 2020) is the company law of Nigeria. The sections below apply to this topic.

SectionWhat it saysLink to this topic
s. 404(1)The auditors report on whether the statements give a true and fair viewMaterial fraud may make the statements untrue or unfair
s. 405Corporate responsibility for financial reportsManagement and the company answer for the reports
s. 406Improper influence on the conduct of auditPressure on the auditor can be a sign of fraud

The rules in more depth

Fraud and error

Fraud is an intentional act by one or more persons that involves deception to gain an unjust or illegal advantage. Error is a genuine mistake or omission and is not intentional. The distinction is intent. A statutory audit aims to give an opinion on whether the financial statements give a true and fair view.

Its objective is not primarily the prevention or detection of fraud. The auditor is concerned with fraud only so far as it could affect the view shown by the statements, which means the risk of material fraud.

Who is responsible

Management has the main responsibility for setting up systems and controls to prevent or detect fraud and error, and internal audit may monitor them. Management may also ask internal audit to review the entity's exposure to fraud or to do a special investigation into suspected fraud.

Under company law the company is answerable for its financial reports (section 405 of the Companies and Allied Matters Act 2020 (CAMA 2020)). The auditor reports to the members on the statements under section 404(1).

The auditor's responsibilities under ISA 240

The objectives under ISA 240, The Auditor's Responsibilities Relating to Fraud in an Audit of Financial Statements, are the same as for other areas: to identify and assess the risks of material misstatement, and to get sufficient appropriate evidence about them through suitable procedures. The auditor must also respond properly to fraud or suspected fraud found during the audit. Professional scepticism is especially important.

ISA 240 says that unless the auditor has reason to believe otherwise, records and documents may be accepted as genuine, and that if management's answers to enquiries are inconsistent, the auditor must investigate the inconsistencies, as they may point to fraud.

The two types of fraud

TypeWhat it includes
Fraudulent financial reportingForging or altering accounting records or supporting documents; misrepresenting or intentionally leaving out events or transactions; intentionally misapplying accounting principles. It often involves management override of controls.
Misappropriation of assetsEmbezzling receipts, for example by diverting them to personal accounts; stealing physical assets such as inventory, or intellectual property, for example by selling trade secrets; making the entity pay for goods and services it did not receive, for example through fictitious suppliers; using the entity's assets for personal use

Procedures to assess fraud risk

ISA 240 requires the auditor to:

  • make enquiries of management about its assessment of the risk of material fraud, the process for identifying and responding to fraud risks, specific risks identified or likely, and communications within the entity about fraud, including to employees about management's views on business practices and ethical behaviour;
  • enquire of management and others in the entity whether they know of any actual, suspected or alleged frauds and get their views on fraud risk;
  • evaluate unusual or unexpected relationships found in analytical procedures that may indicate fraud risk; and
  • evaluate information from other risk assessment procedures to see if fraud risk factors are present.

Fraud risk factors

Fraud risk factors are best grouped under three headings, known as the fraud triangle: pressure or incentive, opportunity and attitude or rationalisation.

HeadingExamples
Pressure or incentiveThe need to meet third-party expectations, for example to get more finance; management paid profit-related bonuses; profitability under threat from competition or technology; personal financial problems or fear of redundancy among staff
OpportunityAn ineffective control environment; an industry or operations with complex transactions or significant estimates; large amounts of cash or highly portable, valuable inventory; poor controls over assets, such as no segregation of duties
Attitude or rationalisationLow staff morale; poor communication or enforcement of ethical standards by management; a dominant individual who ignores the rules

The response to fraud risk

Having identified risks of material misstatement due to fraud, the auditor must under ISA 330 design and carry out further procedures to deal with them. ISA 240 also expects the auditor to:

  • treat the risk of fraud in revenue recognition as a significant risk unless there is a good reason not to;
  • treat management override of controls as a risk in every audit, and test journal entries, review accounting estimates for bias and examine significant transactions outside the normal course of business;
  • build an element of unpredictability into the procedures, such as unannounced visits or testing items not normally tested; and
  • assign more experienced staff and increase supervision where fraud risk is high.

If fraud is found or suspected

If the auditor finds fraud, it must be reported to an appropriate level of management as soon as practicable. If management may be involved, the auditor reports to those charged with governance. The auditor evaluates the effect on the financial statements and on the audit report, and considers whether there is a statutory duty to report to the authorities.

The topic on non-compliance with laws and regulations sets out the framework for deciding whether to disclose outside the entity. Where the fraud makes the statements materially misstated, the opinion is modified.

Worked examples

Example 1: fraud or error? A clerk enters ₦250,000 twice by mistake. Another clerk enters an invoice twice on purpose to pay a friend's company.

  1. The first is error: no intent.
  2. The second is fraud: intent and deception.

Example 2: type of fraud. (a) The managing director backdates sales to meet a profit target. (b) A cashier diverts customers' cash into his own account.

  1. (a) Fraudulent financial reporting: misstating the records, with override of controls.
  2. (b) Misappropriation of assets: embezzling receipts.

Example 3: risk factors. A company has a profit-linked bonus for directors, a weak control environment, cash takings of ₦20 million a month and staff who are not paid on time.

  1. Pressure or incentive: the bonus, and staff pay problems.
  2. Opportunity: weak controls and large cash.
  3. The auditor assesses a high fraud risk and plans extra work on revenue, cash and journals.

Example 4: inconsistent answers. The finance director says sales rose because of a new product. The sales manager says there was no new product.

  1. The answers are inconsistent, and ISA 240 requires the auditor to investigate.
  2. The auditor examines the product list, the orders and the cut-off, and widens the testing if needed.

How to score full marks

  • Define fraud and error by intent.
  • Say clearly that management is responsible and that the auditor gives reasonable assurance on material misstatement.
  • Group risk factors under pressure, opportunity and rationalisation.
  • Name the two types of fraud with an example of each.

Common mistakes in the exam

  • Saying the auditor is responsible for preventing fraud.
  • Saying the audit guarantees that no fraud exists.
  • Forgetting management override and revenue recognition.
  • Not stating that fraud must be reported to management.

Quick revision

  • Fraud is intentional; error is not.
  • Management prevents and detects; the auditor assesses and responds.
  • Two types: financial reporting and misappropriation.
  • Risk factors: incentive, opportunity, rationalisation.
  • Report to management and consider the authorities.

Practice questions

Questions 1 to 10 are multiple choice. Questions 11 to 13 are written. Try each before opening the answer.

Question 1. Fraud differs from error because fraud is:

  1. Intentional
  2. Larger
  3. Older
  4. Easier to find
Show the answer

A. It involves intent and deception.

Question 2. The main responsibility for preventing fraud lies with:

  1. The external auditor
  2. Management
  3. The registrar
  4. The tax authority
Show the answer

B. Management and those charged with governance.

Question 3. ISA 240 deals with:

  1. The auditor's responsibilities relating to fraud
  2. Materiality
  3. Sampling
  4. Written representations
Show the answer

A. Fraud in an audit of financial statements.

Question 4. Forging accounting records is:

  1. Fraudulent financial reporting
  2. Misappropriation of assets
  3. An error
  4. A tax matter
Show the answer

A. It misstates the records.

Question 5. Creating a fictitious supplier is:

  1. Misappropriation of assets
  2. An error
  3. A control
  4. Fraudulent reporting only
Show the answer

A. The entity pays for goods not received.

Question 6. Which is a fraud risk factor of pressure?

  1. Profit-related bonuses for management
  2. A strong control environment
  3. Segregation of duties
  4. Staff rotation
Show the answer

A. An incentive to misstate.

Question 7. If management's answers to enquiries are inconsistent, the auditor must:

  1. Ignore them
  2. Investigate the inconsistencies
  3. Accept the first answer
  4. Resign
Show the answer

B. As ISA 240 requires.

Question 8. Management override of controls is especially linked to:

  1. Fraudulent financial reporting
  2. Petty cash
  3. Tax
  4. Inventory counts
Show the answer

A. It is often used in misreporting.

Question 9. A fraud found by the auditor must be reported:

  1. To an appropriate level of management as soon as practicable
  2. Only at the end of the year
  3. Only to shareholders
  4. Never
Show the answer

A. And the auditor considers any statutory duty.

Question 10. An audit gives:

  1. A guarantee that no fraud exists
  2. Reasonable assurance that statements are free from material misstatement
  3. No assurance
  4. Absolute assurance
Show the answer

B. Reasonable assurance only.

Question 11 (10 marks). Distinguish between fraud and error and explain the responsibilities of management and the auditor for fraud. (8 marks)

Question 12 (10 marks). Describe the two types of fraud identified by ISA 240 with two examples of each. (6 marks)

Question 13 (10 marks). Explain fraud risk factors under the headings of pressure, opportunity and rationalisation, and the auditor's response. (6 marks)

Model answers

Show the model answer to Question 11

Fraud: intentional act involving deception for an unjust or illegal advantage; error: unintentional mistake. (2) Management prevents and detects fraud through controls. (2) Auditor: obtains reasonable assurance that the statements are free of material misstatement from fraud or error, assesses fraud risk, maintains scepticism, responds and reports; the audit is not an investigation. (4)

Show the model answer to Question 12

Fraudulent financial reporting: forging or altering records; omitting transactions; misapplying accounting principles; often management override. (3) Misappropriation of assets: embezzling receipts; stealing inventory; fictitious suppliers; personal use of assets. (3)

Show the model answer to Question 13

Pressure: bonuses, expectations, threats to profit; opportunity: weak controls, cash, complex estimates; rationalisation: poor ethical tone. (3) Response: ISA 330 procedures; revenue and override tests; unpredictability; more experienced staff; report to management. (3)

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All Audit, Assurance and Forensics topics

You are reading topic 22 of 67.

  1. Meaning and objectives of audit, the need for audit and types of audit01
  2. Assurance engagements, levels of assurance and sustainability assurance02
  3. Statutory audit and the legal framework: CAMA 2020 and the FRC Act03
  4. International standards on auditing, assurance engagements and Nigerian standards04
  5. Obtaining and accepting a new audit engagement05
  6. Engagement letters: agreeing the terms of an audit engagement (ISA 210)06
  7. Fundamental ethical principles and the conceptual framework07
  8. Independence, objectivity and integrity of the auditor08
  9. Confidentiality in audit and assurance engagements09
  10. Conflicts of interest and resolving ethical conflicts10
  11. Non-compliance with laws and regulations (NOCLAR) and whistleblowing11
  12. Public interest and professional scepticism in audit and assurance12
  13. Rules-based and principles-based ethics, and ethics in governance13
  14. Internal audit: concept, role and its place in internal control14
  15. Internal audit compared with external audit15
  16. Operational and other internal audit assignments16
  17. Internal audit reports, regulation, ethics and outsourcing17
  18. Planning an audit (ISA 300)18
  19. Understanding the entity, its environment and its laws (ISA 315 and ISA 250)19
  20. Materiality in planning and performing an audit (ISA 320)20
  21. Audit risk and the auditor\u2019s response to assessed risks (ISA 330)21
  22. Fraud and the auditor (ISA 240)22 here
  23. Audit of not-for-profit organisations23
  24. Public sector audit24
  25. Audit evidence (ISA 500)25
  26. Audit documentation and working papers (ISA 230)26
  27. Audit sampling (ISA 530)27
  28. Importance, objectives and types of internal control28
  29. Control environment, the risk assessment process and monitoring of controls29
  30. Control activities and IT controls30
  31. Limitations of internal control and recording control systems31
  32. Evaluating controls and assessing audit risk32
  33. Risks of specialised IT systems and information security measures33
  34. Tests of controls and the main transaction cycles34
  35. The sales system: controls and tests of controls35
  36. The purchases and expenses system: controls and tests of controls36
  37. The payroll system: controls and tests of controls37
  38. The bank and cash system: controls and tests of controls38
  39. The inventory and non-current asset systems: controls and tests of controls39
  40. Management letters and reporting control deficiencies40
  41. Substantive procedures: role and approach41
  42. Analytical procedures (ISA 520)42
  43. Audit of tangible non-current assets43
  44. Audit of intangible non-current assets44
  45. Inventory: valuation and the physical count (ISA 501)45
  46. Trade receivables, prepayments and external confirmations (ISA 505)46
  47. Substantive procedures on bank and cash balances47
  48. Trade payables, accruals, provisions and contingencies48
  49. Non-current liabilities, equity and directors\u2019 emoluments49
  50. Key income statement figures50
  51. Written representations (ISA 580)51
  52. Evaluating misstatements (ISA 450) and the overall review of the financial statements52
  53. Purpose of the auditor\u2019s report and the audit expectation gap53
  54. The unmodified auditor\u2019s report (ISA 700)54
  55. Key audit matters (ISA 701) and reports prescribed by law55
  56. Audit reporting under CAMA 2020 and the audit committee56
  57. Going concern (ISA 570)57
  58. Modified opinions, emphasis of matter and other matter paragraphs58
  59. Information systems audit: risks, protection and the audit process59
  60. Vulnerability audit, data centre audit, banking transactions and IT audit reports60
  61. Data analytics, artificial intelligence, blockchain and other audit technology61
  62. Nature, objectives and types of forensic accounting services62
  63. Economic damage through contract and tort63
  64. Computer forensics, fraud investigation and litigation support64
  65. Hidden assets: how forensic accountants find them65
  66. Professional negligence in forensic investigations66
  67. The expert report and reporting in forensic engagements67
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