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Accounts Payable Internal Controls: Preventing Fraud and Errors

📅 March 15, 2026 ⏱ 9 min read
accounts payable controls AP fraud prevention ERP AP management
P&L Statement — Q1 2026 REVENUE Sales RevenueRs 48,200,000 Other IncomeRs 1,200,000 Total RevenueRs 49,400,000 EXPENSES Cost of Goods SoldRs 28,400,000 Operating ExpensesRs 7,800,000 Tax ProvisionRs 2,100,000 Net ProfitRs 11,100,000 Revenue vs Expenses — 2026 Jan Feb Mar Apr May Jun Jul Aug Revenue Expenses Gross Margin 22.5%

AP fraud is the most common form of business fraud. These ERP controls prevent it without creating bureaucratic bottlenecks.

Three-Way Matching: The Core Control

Every AP payment should be matched to a purchase order (authorization), a goods receipt note (delivery confirmation), and a supplier invoice (claim). Discrepancies must be resolved before payment — this single control eliminates most AP fraud.

Vendor Master Management

New vendor creation should require independent authorization. Vendor bank account changes should trigger approval workflows and send confirmation emails to the previous bank account. Fake vendor creation is a common fraud vector.

Duplicate Invoice Detection

ERP should automatically flag invoices from the same vendor for the same amount within a defined period — potential duplicates that require investigation before payment.

Segregation of Duties in AP

No single person should be able to create a vendor, create a PO, approve the invoice, and initiate the payment. AP segregation of duties requires minimum 2-3 different people in the payment cycle.

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