What is Accounts Payable (AP)?

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Accounts payable (AP) is the total amount a business owes to its suppliers and vendors for goods and services it has received but not yet paid for. It appears on the balance sheet as a current liability.

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AP arises whenever a business purchases on credit. The moment a supplier invoice is received and payment is deferred, an AP balance is created. That balance is cleared when payment is made.

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Why AP matters

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AP management is primarily about two things: paying suppliers accurately and on time, and doing so in a way that protects the business. Paying early can secure early payment discounts. Paying late can damage supplier relationships and incur penalties. Paying the wrong amount — or paying the same invoice twice — is a direct hit to the bottom line.

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For finance teams, AP is also a controls function. Every supplier invoice needs to be validated against a purchase order and delivery confirmation before payment is approved. This three-way matching process is the primary defence against duplicate payments, fraudulent invoices, and incorrect charges.

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The AP process

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Invoice receipt. Supplier invoices arrive by email, EDI, or supplier portal. In many organisations this step is still largely manual.

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Invoice validation. The invoice is checked for accuracy — correct supplier, correct amount, correct period. For PO-backed invoices, the invoice is matched against the purchase order and goods receipt.

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Approval workflow. Invoices above certain thresholds require manager or director approval before payment is authorised.

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Payment. Approved invoices are scheduled for payment according to terms. Payment runs are batched and executed.

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Reconciliation. The AP subledger is reconciled to the general ledger at period end. Supplier statement reconciliations confirm that what is owed agrees with what the supplier believes is outstanding.

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Where AP breaks

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The most common AP problems are: invoices that arrive without a matching purchase order, approval bottlenecks that cause invoices to be paid late (or to expire on early payment discount windows), duplicate invoice submissions from suppliers, and manual data entry that introduces errors. Each of these is addressable through AP automation.