What Is Three-Way Matching?
A Complete Guide for Businesses — the accounts payable control that catches errors before you pay
Paying supplier invoices may seem straightforward, but processing payments without proper checks can lead to costly mistakes. Businesses may accidentally pay duplicate invoices, pay for goods that were never delivered, or approve incorrect prices.
To reduce these risks, many organizations use a process known as three-way matching.
Three-way matching is one of the most important internal controls in the accounts payable process. It helps ensure that supplier invoices are accurate before payment is approved.
Here's what you'll walk away knowing:
- What three-way matching is
- Why it is important
- The documents involved
- How the process works
- Common exceptions
- Benefits and best practices
What Is Three-Way Matching?
Three-way matching is an accounts payable control that compares three key documents before a supplier invoice is approved for payment:
- Purchase Order (PO)
- Goods Received Note (GRN) or receiving record
- Supplier Invoice
The invoice is approved only when the information on all three documents agrees within the company's accepted tolerance limits.
This process helps verify that:
- The purchase was authorized.
- The goods or services were received.
- The invoice is accurate.
Why Is Three-Way Matching Important?
Three-way matching protects businesses from paying invoices that are incorrect or unsupported. It helps to:
- Prevent duplicate payments
- Detect pricing errors
- Confirm receipt of goods
- Reduce fraud
- Improve financial accuracy
- Strengthen internal controls
- Support external audits
Without this process, businesses may pay invoices without confirming that the related goods or services were actually received.
The Three Documents Explained
1. Purchase Order (PO)
The purchase order is created before the purchase. It specifies the supplier, items ordered, quantities, agreed prices, and delivery terms. The PO confirms that the purchase was authorized.
2. Goods Received Note (GRN)
The GRN is created when the goods arrive. It confirms what was delivered, quantities received, condition of the goods, and delivery date. The GRN proves that the business received the goods.
3. Supplier Invoice
The supplier issues an invoice requesting payment. The invoice includes products or services supplied, quantities, prices, taxes, total amount due, and payment terms. The invoice is the payment request that must be verified before payment.
How Three-Way Matching Works
The purchasing department creates an approved purchase order.
The supplier ships the order.
The receiving team checks the delivery and prepares a GRN.
The supplier submits an invoice for payment.
The finance team compares the purchase order, goods received note, and supplier invoice.
If all information matches, the invoice is approved for payment.
The supplier is paid according to the agreed payment terms.
What Is Checked During Three-Way Matching?
The accounts payable team typically compares:
Supplier Name
The supplier should match across all documents.
Purchase Order Number
The invoice should reference the correct purchase order.
Product Descriptions
Items billed should match the items ordered and received.
Quantities
The quantity on the invoice should agree with the quantity ordered and the quantity received.
Unit Prices
Prices should match the agreed purchase order.
Taxes
Tax calculations should be accurate and comply with applicable regulations.
Total Amount
The invoice total should reflect the agreed quantities and prices.
Example of Three-Way Matching
Imagine a business orders 20 office chairs.
| Document | Details |
|---|---|
| Purchase Order | Quantity: 20 · Price: $150 each |
| Goods Received Note | Quantity received: 20 |
| Supplier Invoice | Quantity billed: 20 · Price: $150 each |
Everything matches. The invoice is approved.
Now consider a different scenario.
| Document | Details |
|---|---|
| Purchase Order | 20 chairs |
| GRN | 20 chairs received |
| Invoice | 25 chairs billed |
Because the invoice quantity does not match the PO and GRN, the discrepancy must be investigated before payment.
Common Exceptions
Three-way matching often identifies issues such as:
- Price Differences — the supplier charges more than agreed.
- Quantity Differences — the invoice includes more items than were received.
- Missing Purchase Order — an invoice arrives without an approved purchase order.
- Missing GRN — the invoice is received before the goods.
- Duplicate Invoices — the same invoice is submitted twice.
- Incorrect Supplier — the invoice does not match the approved supplier.
Benefits of Three-Way Matching
Better Financial Control
Only verified invoices are paid.
Fraud Prevention
It becomes much harder to submit fake or unauthorized invoices.
Reduced Errors
Incorrect invoices are identified before payment.
Improved Cash Flow
Businesses avoid paying amounts they do not owe.
Stronger Audit Trail
Every payment is supported by complete documentation.
Better Supplier Relationships
Disputes can be resolved using documented evidence rather than assumptions.
Challenges of Three-Way Matching
Although highly effective, three-way matching can present challenges:
- High Invoice Volumes — manual matching becomes time-consuming as transaction volumes increase.
- Delayed GRNs — late recording of goods receipts can delay invoice approvals.
- Partial Deliveries — invoices may need to be matched against multiple GRNs.
- Manual Errors — incorrect document references can create unnecessary exceptions.
Many businesses address these challenges by automating the matching process through accounting or ERP software.
Best Practices
- ✅ Require approved purchase orders for significant purchases
- ✅ Record GRNs immediately after inspection
- ✅ Use consistent document numbering
- ✅ Train employees on procurement procedures
- ✅ Investigate discrepancies promptly
- ✅ Establish approval thresholds for invoice variances
- ✅ Use accounting software to automate matching where possible
Three-Way Matching vs Two-Way Matching
Some businesses use two-way matching, which compares only the Purchase Order and the Supplier Invoice. Three-way matching adds the Goods Received Note, providing stronger assurance that the goods were actually received before payment is made.
For organizations that purchase physical goods, three-way matching generally offers a higher level of control.
Conclusion
Three-way matching is one of the most effective internal controls in accounts payable. By comparing the purchase order, goods received note, and supplier invoice before payment, businesses can reduce errors, prevent fraud, and ensure that only valid invoices are paid.
Whether you're managing a small business or working in a large finance department, implementing a reliable three-way matching process helps improve accuracy, accountability, and financial control.
Key Takeaways
- Three-way matching compares the PO, GRN, and supplier invoice before payment is approved.
- It catches duplicate payments, pricing errors, quantity mismatches, and unauthorized invoices.
- Two-way matching skips the GRN and offers weaker assurance for physical goods.
- Automation through accounting or ERP software reduces the manual burden as volume grows.
Frequently Asked Questions
About the Author
Ishara Vithana is a senior finance professional with over two decades of experience in accounting, bookkeeping, and small business finance. He is a Xero Certified Advisor and Partner, Dext Certified Expert, Fathom Advisor, and Tally Prime expert. Through Finance Made Simple, he helps small business owners and DIY bookkeepers understand accounting, bookkeeping, and business finance with practical, easy-to-follow guides. Connect with Ishara →
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