The Three-Way Match: Reconciling a Purchase Order, Delivery Note, and Invoice
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Create Free Purchase OrderA three-way match is checking a vendor's invoice against both the original purchase order and the delivery note (or goods received note) before paying it, confirming the same items, quantities, and price appear across all three. It catches a problem a simple PO-to-invoice check misses: being billed in full for a delivery that only partly arrived. For a small business, this doesn't need dedicated software, just the habit of pulling all three documents together before approving payment.
Key takeaways
- A three-way match compares the PO (what you ordered), the delivery note or GRN (what arrived), and the invoice (what you're billed) before payment goes out.
- A two-document check, PO against invoice only, misses a partial or damaged delivery that's still billed in full.
- The match happens before payment, not as a bookkeeping exercise afterward when the money's already gone.
- A mismatch anywhere across the three documents is a reason to hold payment and get the vendor to correct it first.
- Filing the PO, delivery note, and invoice together under the same PO number is what makes the match take a minute instead of a search through email.
Why Two Documents Aren't Always Enough
Checking an invoice against the PO catches a price that changed or a quantity that was billed differently from what was agreed. What it can't catch is what actually showed up. A vendor can invoice you for the full quantity on the PO even if the delivery arrived short, damaged, or not at all. Without a third document confirming what was physically received, the invoice and the PO can agree with each other and still be wrong.
The Three Documents and What Each Confirms
| Document | Confirms |
|---|---|
| Purchase order | What you agreed to buy, and at what price |
| Delivery note or GRN | What actually arrived, and in what condition |
| Invoice | What the vendor is billing you for |
Running the Match
- Pull all three documents by PO number: the purchase order, the delivery note or GRN, and the invoice.
- Compare item by item: the same goods, quantities, and unit price should appear on all three.
- Approve payment only if all three agree: no differences between what was ordered, received, and billed.
- Hold and query if any one is different: go back to the vendor for a corrected invoice rather than paying the mismatch.
Keeping This Simple for a Small Business
A three-way match sounds like enterprise accounting software, but at small-business volume it's a filing habit more than a system. Keep the PO, the delivery note, and the invoice together under the same PO number, whether that's a folder or a spreadsheet row, so the three documents are already next to each other when it's time to check them. Our free purchase order generator keeps a record of every PO you send, which is the anchor the other two documents get filed against.
Frequently asked questions
What is a three-way match?
Checking a purchase order, delivery note (or GRN), and invoice against each other before paying, to confirm the same items, quantities, and price appear on all three.
Do I need software to run a three-way match?
Not at small-business volume. Filing all three documents under the same PO number and comparing them before payment covers most small businesses without dedicated software.
What should I do if the delivery note and invoice don't match?
Hold payment and ask the vendor for a corrected invoice. Paying the mismatch first and sorting it out afterward is harder for both sides.
Is a three-way match necessary for every purchase?
It matters most for larger orders or vendors where a discrepancy would be costly. A small, low-value purchase from a trusted supplier often doesn't need the full check.
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