What it means
Fraud can come from outside the business, such as fake invoices, payment redirection scams and stolen card details, or from inside, such as expense padding, payroll tricks or theft of cash. A common way to understand why it happens is the fraud triangle: an opportunity, a pressure or motive, and a way for the person to justify the act to themselves.
Prevention focuses mainly on removing the opportunity, because that is the part the business can control. The foundation is internal control.
Segregation of duties means that no single person handles a transaction from start to finish, so the person who approves a payment is not the one who sets up the supplier or reconciles the bank. Approval limits, dual signatures, regular bank reconciliations and mandatory holidays for staff in sensitive roles all make fraud harder to hide.
Technology adds another layer. Systems can flag duplicate invoices, unusual payment amounts, new bank details for existing suppliers and transactions outside normal hours.
Multi-factor authentication, access restrictions and audit trails limit who can change what in the finance system. People and culture matter equally.
Staff who know that managers review exceptions, that whistleblowing is welcomed and that rules apply to everyone are less likely to try anything. Training helps employees recognise common scams, such as an email that appears to come from the chief executive asking for an urgent transfer.
Controls cost money and slow things down, so they should be proportionate to the risk. A business should list where fraud could occur, estimate the likely loss, and invest first where the exposure is highest.
Regular testing, including surprise audits, confirms that controls work in practice and not just on paper. Reporting channels complete the picture.
An anonymous hotline or a trusted contact outside the management chain allows employees to raise concerns without fear. Many frauds are first noticed by colleagues, so making it easy to speak up is among the most cost-effective controls a business can have.
In practice
Real-world examples
Example 1
A retailer requires a manager to approve any refund above $100 and reviews refund patterns by cashier each week. A cashier who processes unusually many refunds is spotted quickly. The manager also compares refund totals between stores to see whether any location looks unusual.
Example 2
A construction firm receives an email appearing to be from a supplier, announcing new bank details. The accounts team phones the supplier on a known number to confirm before changing anything, and discovers the email was a scam. The company adds a written rule that bank detail changes are never accepted by email alone.
Example 3
A charity rotates the person who counts cash donations each month and requires two people to be present. These simple steps remove the opportunity for one person to take money unnoticed. The charity's trustees review the donations log each quarter to make sure the counts match the bank deposits.
Think of it
Fraud prevention is like locking your front door and leaving a porch light on. It will not stop a determined professional criminal, but it discourages casual opportunists from trying their luck.
Formula
Calculation
Net benefit of a control = Expected fraud loss avoided - Cost of the control
Expected fraud loss avoided = Expected loss without control x Reduction rate
Brookfield Supplies, a fictional distributor, pays $5,000,000 a year to suppliers and estimates that without extra checks about 1.5% could be lost to fraud or error, which is $5,000,000 x 1.5% = $75,000. A new supplier verification and dual approval process is expected to cut that loss by 80%, avoiding $75,000 x 80% = $60,000. The process costs $20,000 a year to run. The net benefit is $60,000 - $20,000 = $40,000 a year.Case study
Seen in the real world
Clearwater Plumbing is an illustrative, fictional company with 40 employees and one bookkeeper who handled payments, supplier set-up and bank reconciliation. The owner trusted her completely and never reviewed the bank statements.
An outside accountant brought in for a tax review noticed several payments to a supplier that the owner did not recognise, totalling $48,000 over two years. The supplier proved to be a company set up by the bookkeeper.
In the illustrative aftermath, the owner split the duties between two people, began reviewing the bank statements monthly and introduced a rule that new suppliers must be approved in writing. The cost of the changes was modest, and the owner reflected that the control weaknesses had been the real problem, not just one person. The owner also arranged for an external accountant to carry out a short review of the books once a year.
Watch out
Common mistakes
- Trusting long-serving staff so much that controls are relaxed, when trusted insiders often have the most opportunity.
- Relying on the annual audit to catch fraud, when auditors sample transactions and are not guaranteed to find it.
- Adding controls that are so heavy that staff work around them, which creates new risks.
Questions
People also ask
What are the most common fraud prevention controls?
Segregation of duties, approval limits, bank reconciliations, supplier verification and access controls are widely used.
What is the fraud triangle?
It is a model saying fraud needs opportunity, pressure and rationalisation, and businesses mainly prevent it by reducing opportunity.
How should a small business start?
It can separate cash handling duties, review bank statements personally each month and verify any change to supplier bank details by phone.