What Is Three-Way Match?

Three-Way Match Explained

The three documents each answer a different question. The purchase order says what was authorized and at what price. The receipt says what physically arrived and when. The invoice says what the supplier is claiming. Matching all three catches the most common payables errors: invoices for goods never received, quantities billed above quantity delivered, and prices above the agreed purchase order price. When any leg fails, the invoice goes on hold rather than into the payment run.

Tolerances make the control workable. Exact matching would hold thousands of invoices for pennies of rounding or a one-unit overshipment. Most ERPs support tolerance by percentage, absolute value, or both, applied separately to price and quantity, and often varying by supplier or commodity. A typical configuration might allow two percent or 50 dollars on price, whichever is lower, and a small quantity tolerance on bulk items. Tolerances set too wide defeat the control; set too tight, they bury the AP team in exceptions and encourage blanket overrides.

A two-way match compares purchase order to invoice only, and is used for services and other items where no physical receipt exists. A four-way match adds inspection or quality acceptance as a fourth document, which is common in aerospace, defense, and pharmaceutical supply chains where material may be received but not accepted. In those environments, paying on receipt rather than acceptance creates real exposure when a lot is later rejected.

The match is also the accounting hinge for accrual. When goods are received, most ERPs debit inventory and credit a received-not-invoiced or goods-received clearing account. When the invoice matches, that clearing account is debited and accounts payable is credited. A growing balance in received-not-invoiced is a reliable indicator of process breakdown, usually receipts posted for goods that never arrived or invoices that were never entered, and it is a standard audit review item.