Plain definition
Three-way matching compares three pieces of evidence before an invoice is paid: what was ordered, what was received or accepted, and what the supplier invoiced. The comparison commonly tests supplier, item or service, quantity, price, and agreed terms. It creates a disciplined question: does the company have evidence that it owes this amount for what it intended to buy?
The exact evidence depends on the purchase. A warehouse receipt may suit goods; a signed service acceptance, milestone record, or timesheet may be more appropriate for services. Matching is not proof that goods meet every quality requirement or that a changed bank account is legitimate; those risks need separate controls.
Illustrative example
Suppose a buyer orders 100 laptops and the warehouse records receipt of 80 because the remaining units are delayed. The supplier invoices for all 100. Accounts payable matches the invoice to the purchase order and receipt record, sees the difference, and holds the unmatched portion under the company’s policy while asking procurement to confirm the delivery status.
When the final units arrive, the warehouse records the receipt and finance can release the remaining payment with evidence. If the delivery cannot be confirmed, procurement can dispute the invoice or seek a credit before cash is released. The match creates a concrete decision, not a routine stamp.
Tolerances for small price or quantity differences should be deliberate, documented, and proportionate to the risk; broad tolerances can silently defeat the control.
Why it matters
It reduces payment for undelivered goods, incorrect quantities, or prices that differ from the approved order.
It gives procurement, operations, and finance a shared evidence trail when a supplier asks why an invoice has not been paid.
Practical consequence
Define the required documents and any tolerances by purchase type, including suitable acceptance evidence for services.
Monitor unmatched invoices by age and cause, assign follow-up to the responsible team, and review repeated differences for a purchasing, receiving, or supplier-data problem.