Fraud rarely begins with a flashy plan. It usually starts small. One person gets much access. A payment goes through without a check. A bank detail changes via email. No one asks why.
Strong internal controls create some friction where it matters. That friction makes it harder to hide behavior and easier to confirm normal work.
Start With Control Over Money
The first thing to examine is payment access. Nobody should have control over a transaction from beginning to end. If one employee can add a vendor approve an invoice. Release the payment that’s a major weakness in the system.
Separate the Important Jobs
Split tasks between different people. One person enters the payment. Another approves it. A third handles the bank release. This separation matters because fraud becomes more difficult when one person cannot quietly move money without someone else noticing.
• Two-person approval for higher-value payments. It takes a few minutes.. Those minutes can prevent a costly investigation later.
• Bank access should be limited to people who truly need it. When roles change old access must be removed quickly.
Watch Vendor and Employee Changes
Fraudsters often use changes to slip through. A vendor’s bank account gets updated. An employee’s salary account changes. A new supplier appears in the system. Each of these might look harmless.
So build a review process around any change that affects money. A bank-detail change should be confirmed through a trusted channel—like a phone call or in-person confirmation—not by replying to the email that asked for it. New vendors should go through a review before any payments are made.
Keep Access Tight
Access should match the job. If someone moves from finance into another role their old payment permissions shouldn’t stay active because no one remembered to remove them.
Review access regularly. Better review it after someone changes roles or leaves. Those moments are easy to forget. They’re especially risky.
Make Transactions Easy to Question
Good controls don’t fill people with paperwork. They make unusual transactions stand out.
• Approval limits should be clear. That way a large payment doesn’t slip through under a rule, like “manager approved it.”
• Exception reports help here. A strange payment pattern might sit unnoticed in a ledger until someone actually looks for it.
• Reconciliations need an owner, not just a checkbox. If the same person prepares and reviews the reconciliation the control loses most of its value.
Build a Culture That Spots Problems
Technology helps.. People still catch a lot of fraud through questions. An employee notices something off. Someone pauses before approving a payment. A finance manager asks why a familiar supplier suddenly has bank details.
Give employees a way to report concerns. Make sure they don’t feel like they’re accusing a colleague. Training should include examples. A fake invoice that looks ridiculous is easy to spot.. A convincing payment request that arrives five minutes before a deadline? That’s harder to see.