Accounts Payable Explained: How the Process Works

1What Is Accounts Payable?

Accounts payable is the process and department responsible for tracking and paying money a company owes to its suppliers and vendors for goods and services already received.

It sits on the liability side of a company's balance sheet, representing short-term obligations that must be settled, typically within 30 to 90 days of an invoice date.

2Accounts Payable vs Accounts Receivable

Accounts payable tracks money a company owes to others, while accounts receivable tracks money owed to the company by its own customers - they sit on opposite sides of the same relationship.

A healthy business manages both carefully, since paying too slowly damages supplier relationships while collecting too slowly strains cash flow.

3The Accounts Payable Workflow

A standard accounts payable process moves through four stages from the moment a purchase is made to the moment payment is issued.

• Purchase order issued: the company formally requests goods or services from a vendor.
• Invoice received: the vendor sends a bill for the goods or services delivered.
• Verification and approval: the invoice is checked against the purchase order and receiving records, then approved by an authorized person.
• Payment issued: the approved invoice is paid according to the agreed terms.

4Three-Way Matching

Three-way matching compares the purchase order, the receiving report confirming goods arrived, and the vendor's invoice before a payment is approved, catching discrepancies before money moves.

This control catches common problems like being billed for items never received, incorrect quantities, or pricing that doesn't match the original agreement.

5Internal Controls in Accounts Payable

Strong internal controls protect a company from duplicate payments, fraudulent invoices, and missed opportunities to save money on early payment discounts.

• Segregation of duties: the person approving an invoice should not be the same person issuing payment.
• Vendor verification: confirming new vendors are legitimate before adding them to payment systems.
• Duplicate payment checks: flagging invoices with matching numbers, amounts, or vendors.
• Payment term tracking: capturing early-payment discounts and avoiding late payment penalties.

6How Automation Is Changing Accounts Payable

Automation software now handles much of the manual invoice entry, matching, and approval routing that accounts payable teams historically did by hand, reducing processing time and error rates.

Optical character recognition extracts data directly from scanned or emailed invoices, while automated matching flags exceptions for human review instead of requiring manual checks on every single invoice.

7Common Accounts Payable Mistakes

A few recurring mistakes create risk or waste money in accounts payable processes.

• Skipping three-way matching to save time, increasing exposure to billing errors and fraud.
• Combining invoice approval and payment issuance in the same role, weakening internal controls.
• Missing early-payment discount windows due to slow approval cycles.
• Failing to reconcile the accounts payable ledger against vendor statements regularly.

8Next Steps

Map your own organization's accounts payable workflow against the four-stage process above and check whether three-way matching and segregation of duties are actually in place.

The glossary and topics library cover related finance and operations concepts worth exploring alongside accounts payable.