What Is Three Way Matching in Accounts Payable?

A supplier invoice can look completely reasonable and still be wrong. The quantity may exceed what arrived, the price may differ from the agreed terms, or the business may be billed twice. That is why finance teams ask, what is three way matching? It is a practical accounts payable control that confirms an invoice agrees with the purchase order and the goods receipt before payment is approved.

For growing businesses, three way matching turns purchasing from a chain of emails, paper delivery notes, and spreadsheet checks into an auditable process. It protects cash flow, improves accountability across procurement and warehouse teams, and gives finance a clearer basis for paying suppliers.

What Is Three Way Matching?

Three way matching compares three records connected to the same purchase:

1. The purchase order (PO) shows what the business authorized to buy, including supplier, item, quantity, price, and payment terms.
2. The goods receipt or receiving record shows what was actually delivered and accepted.
3. The supplier invoice shows what the supplier is requesting to be paid.

Payment should move forward only when the important details align. For example, if a PO authorizes 100 units at $20 each, the warehouse records receipt of 100 units, and the invoice requests $2,000, the match can be approved. If the invoice requests payment for 110 units, the system or reviewer should flag the difference before money leaves the business.

The term is sometimes used broadly, but the principle is simple: pay for authorized purchases that were actually received, at the agreed price. The control applies to inventory, office supplies, raw materials, equipment, and many service purchases, although service workflows often require additional evidence, such as a service confirmation or manager approval.

Why Three Way Matching Matters for SMEs

Without structured matching, accounts payable staff are forced to interpret incomplete information under time pressure. They may need to chase buyers for approval, ask the warehouse whether goods arrived, or search through emails to confirm a price. That creates payment delays and makes errors easier to miss.

Three way matching creates separation between key responsibilities. Procurement authorizes the order, operations confirms receipt, and finance verifies the invoice. No single document is treated as complete proof on its own. This reduces the risk of overbilling, duplicate invoices, unauthorized purchases, and payments for damaged or undelivered goods.

It also improves supplier relationships. When a payment is held, the business can explain precisely why: the received quantity is lower than the invoiced quantity, a price differs from the PO, or a receipt has not been recorded. Clear exception reasons are more constructive than a vague statement that an invoice is still being reviewed.

For management, the benefit is real-time visibility. Open POs show committed spend, receiving records show inventory or expense obligations, and matched invoices show liabilities ready for payment. This supports more accurate cash forecasting and faster month-end closing.

How the Three Way Matching Process Works

The process begins before the invoice arrives. A buyer creates a PO after the appropriate approval, using approved supplier details, item codes, agreed pricing, and expected quantities. The PO becomes the reference point for the transaction.

When goods arrive, a warehouse or receiving employee records what was delivered. This is a crucial step. If the receipt is entered late or not at all, finance may see a valid invoice but have no evidence that the order was fulfilled. For inventory-driven businesses, the receipt should also update stock records so financial and operational data stay aligned.

The supplier then submits an invoice. Accounts payable captures the invoice details and links it to the PO and receipt. A matching workflow compares fields such as supplier identity, PO number, line items, quantities, unit prices, taxes, freight charges, and totals.

If the documents match within the business’s approved rules, the invoice can be routed for payment. If they do not, the invoice becomes an exception. Finance should not simply override the warning to keep work moving. The exception needs an owner and a documented resolution, such as a corrected invoice, an additional receipt, a revised PO, or a credit note.

A Simple Example

Assume a restaurant group orders 50 cases of packaging supplies at $30 per case. The approved PO value is $1,500. The warehouse receives 45 cases because five were backordered, and records that quantity.

The supplier invoices the full $1,500. A three way match identifies that only $1,350 worth of goods have been received. The business can either pay the received portion if its policy allows partial invoicing, or ask the supplier to revise the invoice until the remaining five cases arrive. Either choice is controlled because the difference is visible.

What Should Be Matched?

A useful matching policy goes beyond comparing an invoice total. At a minimum, finance should verify the supplier, PO reference, quantity, unit price, tax treatment, and total amount. Businesses may also need to assess freight, discounts, payment terms, item descriptions, and currency.

The right level of detail depends on the transaction. A low-value recurring purchase may be matched at the invoice total, while high-value inventory purchases should usually be matched line by line. Highly regulated, perishable, or serialized products may require stricter receiving evidence and batch-level traceability.

This is where tolerance rules matter. Minor differences can occur because of rounding, approved freight charges, or agreed quantity tolerances. A policy might permit a small price variance or a limited over-delivery percentage, while routing anything beyond that threshold for review. Tolerances should reduce unnecessary exceptions, not become a way to approve uncontrolled spending.

Common Exceptions and How to Handle Them

Most matching exceptions fall into a few familiar categories: quantity variances, price variances, missing receipts, duplicate invoices, and invoices with no valid PO. Each requires a different response.

A quantity variance may mean goods are still in transit, were partially delivered, or were received but not recorded. A price variance may be legitimate if a buyer approved a revised quotation, but the PO must be updated or the approval documented. A missing PO can signal an emergency purchase, a process gap, or an unauthorized commitment.

The strongest process assigns ownership. Procurement resolves order and price questions. Warehouse or operations resolves delivery questions. Finance controls invoice processing, duplicate checks, payment timing, and audit documentation. Escalation rules should define who can approve an exception and at what value.

Three Way Matching and InvoiceNow

InvoiceNow can improve the quality and speed of invoice intake by enabling structured electronic invoice exchange through the Peppol network. It reduces manual data entry and makes invoice references easier to capture consistently. For Singapore businesses, it can also support a more compliant, traceable invoicing process.

However, InvoiceNow does not replace three way matching. An electronically received invoice may be authentic and correctly formatted, yet still request payment for the wrong quantity or price. The invoice must still be checked against the authorized PO and the receiving record. Digital invoicing strengthens the input; matching strengthens the payment control.

Automating Three Way Matching in ERP

Manual matching can work at low transaction volumes, but it becomes difficult to sustain as purchase orders, deliveries, and invoices increase. An integrated ERP system can connect purchasing, inventory receiving, accounts payable, and approvals around the same transaction record.

With automated matching, the system can retrieve the linked PO and receipt, compare relevant fields, and route only exceptions to the right people. Finance teams spend less time locating documents and more time resolving meaningful discrepancies. Approvers see the reason for a hold, while management gains clearer visibility into pending liabilities, open receipts, and supplier performance.

A2000ERP supports this structured approach by bringing purchasing, inventory, finance, and InvoiceNow-ready invoicing workflows into one operating environment. The result is stronger traceability without forcing an SME to manage a complex, disconnected control process.

Setting Up a Process That People Will Follow

A matching policy succeeds only if the underlying records are timely and accurate. Start with clean supplier records, standardized item codes, clear PO approval limits, and a required receiving process. Train staff on a simple rule: if it was ordered, received, or invoiced, it must be recorded in the system promptly.

Then define the exceptions that genuinely need human judgment. Avoid requiring senior approval for every minor rounding difference, but do require documented review for material price changes, unplanned purchases, and invoices that exceed received quantities. Review exception trends regularly. Repeated missing receipts or recurring supplier price differences usually point to a process problem that deserves correction.

The best three way matching process is not the one with the most approvals. It is the one that gives finance confidence to pay on time, gives operations a reliable record of what arrived, and gives leadership evidence that spend is controlled as the business grows.