Three-Way Match

Three-way match is an accounts payable control that validates a supplier invoice by cross-checking it against two other documents: the purchase order (what was ordered and at what price) and the delivery note or goods receipt (what was actually received). Only when all three match on quantity, price and product is the invoice cleared for payment.

The logic is simple but powerful: an invoice on its own says how much the supplier wants to be paid, but it doesn't prove that the expense was authorized or that the goods arrived. By requiring the purchase order (the prior commitment) and the receipt (the actual delivery) to back every line of the invoice, you shut the door on payments for goods not received, overcharges and duplicate or fraudulent invoices.

This document check is the kind of cross-match that Arconte automates, extracting the data from each document and reconciling them without an analyst having to compare paperwork by hand.

Three-way match is one of the most classic internal controls in the purchasing and accounts payable process (procure-to-pay). The underlying idea is that no payment should leave the company without three aligned pieces of evidence: that the expense was authorized in advance, that the goods or the service actually arrived, and that the supplier is charging what it should. Each of those pieces of evidence lives in a different document, and the match consists of comparing them line by line.

How it works, step by step

The typical cycle starts when the department that needs something issues a purchase order: it sets the supplier, the products, the quantities and the agreed prices. When the goods arrive, the warehouse records a delivery note or receiving document that shows what came in and in what quantity. Finally, the supplier sends its invoice to get paid. Three-way match takes those three documents and checks that they match on three dimensions:

• Quantity: what is invoiced doesn't exceed what was received (or what was ordered).
• Price: the unit price on the invoice is the one agreed on the purchase order.
• Product: the invoice bills exactly what was ordered and received.

If all three dimensions match within the defined tolerances, the invoice is released for payment almost automatically. If something doesn't match, the system holds it and generates an exception that an accounts payable analyst must review before moving forward.

Why it matters

The value of three-way match is twofold. On one hand, it prevents concrete losses: paying for goods that never arrived, accepting a higher price than the one quoted or paying the same invoice twice. On the other, it strengthens internal control: since the person who approves the purchase, the one who receives the goods and the one who pays usually belong to different departments, the match reinforces segregation of duties, a principle that auditors review closely. Every outgoing payment can be traced back to a formal authorization and a proof of delivery.

In the United States, three-way matching is a standard accounts payable practice, and at publicly traded companies it is commonly documented as one of the key controls within the internal control over financial reporting required by the Sarbanes-Oxley Act (SOX). That is why external auditors often test it directly when they review the purchasing cycle.

A concrete example

A food distributor in Buenos Aires issues a purchase order for 500 cases of a product at 1,000 Argentine pesos (ARS) each. The warehouse receives and records 480 cases (20 were missing). A few days later, the supplier's invoice arrives for the full 500 cases. Without three-way match, that invoice would probably be paid as is. With the control in place, the system detects that the receipt says 480 and the invoice says 500: it holds the payment, opens an exception and requires the difference to be resolved (the supplier issues a credit note for the 20 cases or clarifies a pending partial shipment) before anything is released.

Common mistakes

The most frequent problems appear when tolerances are poorly calibrated: if they are too strict, every cent of difference stops a legitimate invoice and floods the exceptions team; if they are too loose, they let overcharges through. Another common mistake is not recording receipts on time, which blocks correct invoices simply because the delivery note hasn't been entered yet. And when the match is done by hand, analysts end up comparing PDF against PDF, which is slow and error-prone.

Three-way match vs. two-way match

The key difference is how many documents go into the match and, therefore, what level of control you get:

In practice, three-way match is the standard for buying goods that are received in a warehouse, while two-way match is reserved for services or expenses where there is no physical receipt to record. When a service acceptance record or a sign-off document also comes into play, some companies talk about a four-way match, but the principle is the same: adding independent evidence before paying.