Three-Way Matching

Three-way matching is an accounts payable control in which a supplier's invoice is compared with two internal records, the purchase order and the goods receipt, before it is approved for payment. The purchase order shows what the company agreed to buy and at what price; the goods receipt shows what actually arrived; the invoice shows what the supplier is charging. If all three agree, within set limits, the invoice can be paid. If they do not, it is held until someone resolves the difference.

The control exists to stop a company paying for goods it did not order, did not receive or was charged too much for. It is a standard feature of the procure-to-pay cycle in organisations that buy physical goods, and it is built into most enterprise resource planning systems. It is a fuller version of two-way matching, which compares only the invoice and the purchase order.

Each document is created by a different part of the business, which is what gives the match its value as a control:

• Purchase order. Raised by the purchasing team and sent to the supplier, it records the items, quantities, unit prices, delivery terms and payment terms agreed.
• Goods receipt. Recorded by the warehouse or receiving department when a delivery arrives, it states the quantity accepted and notes any damage or shortage. For services, an acceptance or timesheet sign-off plays the same part.
• Supplier invoice. Issued by the supplier and received by the accounts payable team, it requests payment for specific quantities at specific prices, plus tax and any delivery charges.

The comparison is made line by line. Purchase order matching confirms that the invoiced items and unit prices are those that were ordered. Goods receipt matching confirms that the invoiced quantity does not exceed the quantity received. Together with checks on the supplier's identity, tax amounts and totals, these make up invoice matching as a whole.

Exact agreement is not always required. Companies set tolerances, for example a small percentage or a fixed amount per line, so that rounding differences and minor freight variations do not block payment. An invoice inside tolerance is approved automatically and scheduled for payment on its due date. One outside tolerance becomes an exception and is routed, through the invoice approval workflow, to the buyer or the receiving department to investigate.

As an example, a company orders 100 units at 50 each. The warehouse records receipt of 90 units, and the supplier invoices for 100 units at 50, a total of 5,000. Price matches, but the quantity invoiced exceeds the quantity received by 10 units. The invoice is held. The outcome may be a part payment of 4,500, a later delivery of the missing units, or a credit from the supplier handled through credit note processing.

Most blocked invoices fall into a few groups: a price on the invoice that differs from the order, often because a contract price changed without the order being updated; a quantity mismatch caused by partial deliveries or by a receipt that has not yet been entered; an invoice that quotes no purchase order number or a wrong one; and duplicate invoices. Unresolved cases may become a disputed invoice. Late entry of goods receipts is the most frequent internal cause, and it delays payment to suppliers who have done nothing wrong.

Three-way matching is one of the main defences against payables fraud. A fictitious invoice from a fake supplier fails because there is no order and no receipt behind it. Inflated invoices and billing for undelivered goods fail on price or quantity. The control depends on segregation of duties: if one person can raise an order, record a receipt and approve an invoice, the match proves nothing, which is the usual route for employee collusion with a supplier.

The match does not confirm where the money is sent. A genuine, fully matched invoice can still be paid to a criminal's account if the supplier's bank details have been changed fraudulently, as in a business email compromise scam. Controls over vendor master data are therefore needed alongside it.

Some companies add a fourth document, an inspection or quality acceptance report, which is known as four-way matching. Others skip matching for low-value purchases, recurring charges such as rent and utilities, or supplier relationships that use evaluated receipt settlement, in which the buyer pays on the basis of the order and receipt without waiting for an invoice.

The approach suits goods better than services, where there is often no physical receipt and confirmation depends on a manager's sign-off. It also adds work and can slow payments when order and receiving data are poor. Automation, including electronic invoicing and data capture from scanned invoices, has reduced the manual effort, and many organisations now measure the share of invoices that pass the match without human involvement.