Definition
The Fraud Triangle is a framework for understanding how pressure or incentive, perceived opportunity, and rationalisation can contribute to fraudulent behaviour. It provides a structured way to examine the circumstances in which fraud may occur. (ACFE: Fraud 101)
Context
The framework is widely used in discussions of occupational fraud, fraud risk assessment and internal controls.
Its intellectual roots lie in Donald R. Cressey’s research into violations of financial trust, published in Other People’s Money in 1953. His work examined, among other things, financial problems that individuals felt unable to disclose to others. The familiar label “Fraud Triangle” emerged later: Tickner and Button’s historical analysis notes that Cressey himself never used the expression. (ACFE: Fraud 101; Tickner and Button, 2021)
Meaning
The framework offers three perspectives for examining a potential fraud risk:
• Pressure or incentive: What might motivate the conduct? This could include personal financial difficulties, pressure to meet business targets, or the prospect of a personal benefit.
• Perceived opportunity: What makes the person believe the conduct is possible and may go undetected? Weak oversight, ineffective controls or the ability to override controls may contribute.
• Rationalisation: How does the person make the conduct acceptable to themselves? For example, they may regard an unauthorised withdrawal as temporary borrowing.
These three categories are also reflected in the US auditing standard AS 2401. (PCAOB: AS 2401, paragraph .07)
In practice, the framework can help organise observations, develop hypotheses for further examination and identify possible preventive measures. Independent approval and effective checks, for example, can address opportunities for misconduct.
Risk factors are not proof of fraud. Equally, failing to identify one of the three factors does not rule out a fraud risk. In the context of financial statement audits, AS 2110 explicitly states that auditors do not need to observe all three conditions to conclude that a fraud risk exists. (PCAOB: AS 2110, paragraphs .65–.66)
Example
Fictional illustration.
An employee struggling with personal debt is responsible for a cash fund. Independent cash counts are infrequent, and the employee believes a withdrawal could remain unnoticed. They take money without authorisation, telling themselves that they will replace it when their next bonus arrives.
The scenario illustrates each element:
• Pressure: Personal debt creates a financial strain.
• Opportunity: Infrequent checks make an undetected withdrawal appear possible.
• Rationalisation: The employee treats the withdrawal as temporary borrowing, justified by an intention to repay.
The example illustrates the framework; personal debt or weak controls alone do not establish that any particular individual has acted dishonestly.
Sources
Suggested citation
wirtschaftsforensik.ch Editorial Team: "Fraud Triangle", in: Glossary, wirtschaftsforensik.ch, https://wirtschaftsforensik.ch/glossar/fraud-triangle/, accessed November 7, 2026.