Three-way matching, also written 3-way matching, is the accounts payable control that compares three documents before a supplier invoice is approved for payment: the purchase order, which records what the buyer committed to buy, the receiving record, which records what independently arrived, and the supplier invoice, which records what is being billed. Payment is released only when item, quantity and price agree across all three. A disagreement on any of those three points holds the invoice until somebody explains or corrects it.
The Three Documents and What Each One Proves
The purchase order is the buyer’s own commitment, issued before anything ships. It fixes the item, the quantity ordered, the agreed unit price and the terms, and it is the only one of the three written by the buyer before the supplier has any claim to money.
The receiving record, also called a goods receipt or a receiving report, is the entry made when the goods or services actually turn up. It is the only one of the three documents that records something that physically happened rather than something a party intends or claims.
The supplier invoice is the demand for payment, and it is the only one of the three the supplier writes. On its own it is a claim, and the match is what tests it.
Federal payment rules set out what a receiving record has to carry, and that content is a useful floor even where the rules themselves do not bind. The information required from receiving reports, delivery tickets and evaluated receipts includes the quantities received, the dates goods were delivered or services were provided, the dates they were accepted, and the signature or a supported electronic alternative with the printed name of the receiving official (5 CFR 1315.9, the Prompt Payment documentation rule). That list is a working definition of independence: an event, dated, and attributed to a named person who is not the supplier.
Those requirements bind federal agencies rather than a private firm or its clients, so what carries over is the content and not the obligation. What the same rule specifies on the invoice side is covered in what an accounts payable outsourcing case study has to report.
Two-Way Matching and the Document It Leaves Out
A two-way match compares the supplier invoice with the purchase order and stops there. Dropping the receiving record removes the only evidence that anything arrived, so a bill for goods that were never delivered can agree with its order on every line and still pass. What that difference costs once the comparison is automated, including who sets the price and quantity tolerances, is worked through in invoice processing automation.
A Worked Example
Say a client orders paper for its office, the supplier ships part of the order, and the invoice bills the whole of it.
Purchase order 140 reams at $6.50 each $910.00
Receiving record 128 reams received
Supplier invoice 140 reams at $6.50 each $910.00
Quantity invoiced 140
Quantity received 128
Difference 12 reams
Amount the receipt supports 128 x 6.50 = $832.00
Amount invoiced 140 x 6.50 = $910.00
Unsupported 910.00 - 832.00 = $78.00
Check 12 x 6.50 = $78.00Item and unit price agree across all three documents, so the failure is isolated to quantity, and the amount in dispute is the short delivery priced at the agreed rate. The invoice then waits on the person who took delivery rather than on the person who keyed the bill, because the receiving record is the document the other two disagree with.
Where 3-Way Matching Sits in a Firm’s Work
The match is a preventive control over cash disbursements. Federal internal control standards separate the two kinds of control by timing: a preventive control activity is designed to avoid an unintended event or result before it occurs, while a detective control activity is designed to discover and timely correct an unintended event or result after it occurs. Those standards prioritize preventive control activities where appropriate, because they generally offer the most cost-efficient use of resources (GAO, Standards for Internal Control in the Federal Government, paragraphs 10.10 and 10.12). Three-way matching happens before the money moves, which is what puts it on the preventive side.
The control then depends on who creates the receiving record. If one person orders, receives and pays, the three documents stop being independent and the match compares one person’s word with itself. The same standards frame this as separating control activities related to authority, custody, and accounting of operations, and where that separation is not practical because of limited personnel or other factors, management designs alternative control activities to mitigate the risk instead (paragraphs 10.22 and 10.23).
For a firm auditing a client rather than running the client’s payables, the match is a control an auditor may examine, and whether its operating effectiveness has to be tested at all is a separate question set out in tests of controls.
What Three-Way Matching Is Not
The price gap a failed match reports is the invoice measured against the order. It is not purchase price variance, which measures the price paid against a standard cost set in advance and is struck on the quantity purchased rather than on the quantity billed.
Agreement across the three documents is also not a judgment that the purchase was worth making. The match tests a bill against decisions already taken, which is a different question from the one asked when the spend was approved, and the two approvals are kept apart in the procure to pay process. Once the invoice posts, the balance it leaves behind is an ordinary account payable.
Common Questions
No invoice is approved on its own evidence. The principle is that a supplier’s bill has to agree with an independent record of what the buyer committed to, and with an independent record of what arrived, on item, quantity and price, before it is cleared for payment.
A supplier invoices at a higher unit price than the purchase order set. The receiving record confirms the quantity that arrived, so item and quantity agree across all three documents and price does not, and the invoice is held on the price line until either the order or the bill is corrected.
Two-way matching compares the invoice with the purchase order. Three-way matching adds the receiving record, the only one of the three documents that evidences delivery, so the difference is between confirming that a bill was agreed and confirming that it was earned.
It is the step between recording a supplier invoice and releasing it for payment. The receiving record has to exist first, which puts part of the work outside accounts payable, and an invoice that fails the comparison is held rather than posted.
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