Accounts payable and payment controls
What Is Three-Way Matching? AP Control Guide
Direct answer
Three-way matching is an accounts-payable control that compares an approved purchase order, evidence of accepted receipt such as a GRN, and the supplier invoice before payment. The match tests whether the supplier, item, quantity, price and terms agree. Differences are routed for review under company policy; a match is operational evidence, not by itself proof that every tax or payment requirement is satisfied.
Also known as: PO-GRN-invoice matching, purchase order receipt invoice match.
Key takeaways
- The three records answer different questions: what was approved, what was accepted, and what the supplier billed.
- A useful match works at line level and preserves shortages, rejections, price differences and duplicate signals instead of netting them away.
- Tolerance limits are internal operating policy, not a universal statutory threshold.
- Receipt evidence supports the match, but the business must separately evaluate tax, contract and payment requirements.
- The next control after a clean match is independent payment approval, followed by bank-reference reconciliation.
What the purchase order, GRN and invoice prove
A purchase order records the approved commercial instruction: supplier, item, ordered quantity, agreed price, delivery location and terms. A Goods Received Note records what the receiving team physically accepted, when and where. The supplier invoice states what the supplier requests to be paid. Three-way matching compares those records without treating any one as conclusive.
Operational guidance: match the supplier and document references first, then compare line identifiers, description, unit of measure, quantity, unit price, tax fields and totals. The CBIC invoice rules specify particulars for a GST tax invoice, but they do not prescribe a company’s three-way-match workflow. The CGST Act’s receipt condition for input tax credit is also not a rule that every company must use a GRN or a particular tolerance.
A practical line-level matching workflow
- Confirm that the supplier master record and purchase order are approved and active.
- Normalize document numbers, units and item codes while retaining the original values.
- Link each invoice line to the relevant PO line and accepted receipt line.
- Compare ordered, received, accepted and invoiced quantities separately.
- Recalculate price extensions, discounts, freight and tax rather than trusting a stated total.
- Apply only documented tolerances and record which rule released a difference.
- Route unmatched lines to the owner who can resolve the underlying fact: buyer, receiver, supplier or tax team.
- Approve the payable only for supported quantities and values; preserve the exception history.
Automation can propose links and calculate differences, but it should not silently manufacture a receipt or change an approved price.
Worked match for an appliance distributor
Fictional example: Northstar Appliances orders 120 mixer-grinders from Meridian Components at ₹1,800 each, excluding tax. The warehouse receives all 120 but rejects four with cracked housings. The supplier invoices all 120. The team keeps quantity facts visible:
| Record | Quantity | Unit price | Extended value | Control result |
|---|---|---|---|---|
| Approved PO | 120 ordered | ₹1,800 | ₹2,16,000 | Commercial ceiling |
| GRN | 116 accepted; 4 rejected | ₹1,800 | ₹2,08,800 accepted | Receipt ceiling |
| Supplier invoice | 120 billed | ₹1,800 | ₹2,16,000 | ₹7,200 quantity exception |
The supported pre-tax value is 116 × ₹1,800 = ₹2,08,800. The ₹7,200 relating to four rejected units stays blocked pending replacement or a supplier credit note. The receiver’s rejection record, photos and supplier communication remain attached. Tax treatment is reviewed separately against the applicable invoice, receipt and credit-note facts.
How to design tolerances without hiding leakage
- Define separate quantity, price and total-value tolerances; do not use one broad percentage for every difference.
- Set tighter or zero tolerance for bank details, supplier identity, duplicate invoices and unapproved items.
- Use absolute and percentage caps together so a small rate does not release a large-value variance.
- Measure cumulative variance by supplier and buyer to detect repeated amounts just below a threshold.
- Require a reason code, owner and evidence for every manual release.
- Review overrides independently and retire tolerances that no longer fit purchase patterns.
These are policy choices. Appropriate limits depend on product characteristics, contract terms, risk and materiality; they are not GST thresholds or universal audit rules.
Two-way matching versus three-way matching
| Question | Two-way match | Three-way match |
|---|---|---|
| Records compared | Usually PO and invoice | PO, accepted receipt and invoice |
| What it controls well | Price and ordered-quantity differences | Price, ordered quantity and whether goods were accepted |
| Main blind spot | May pay for ordered goods that were short or rejected | Still depends on accurate receipt capture and does not replace quality, tax or fraud checks |
| Typical use | Services or low-risk purchases where receipt evidence is handled differently | Physical goods and purchases where accepted quantity is a payment condition |
Neither method is automatically correct for every purchase. A service-entry sheet, milestone approval or contract acceptance may replace a warehouse GRN. The control should reflect how performance is evidenced.
Common exceptions and who should resolve them
| Exception | Likely first owner | Evidence to close |
|---|---|---|
| Invoice quantity exceeds accepted quantity | Receiving team and supplier | Corrected GRN, replacement acceptance or credit note |
| Invoice price exceeds PO | Buyer | Approved PO amendment or corrected invoice |
| Receipt exists without invoice | AP and supplier | Valid invoice or accrual decision |
| Invoice appears twice | AP control owner | Duplicate review and blocked document trail |
| Item or unit differs | Buyer and receiver | Approved substitution and unit conversion |
Closing an exception means resolving the source fact, not merely changing a status. Age open items, escalate repeated root causes and report manual releases separately.
Frequently asked questions
Is three-way matching required by GST law?
GST law does not prescribe a universal three-way-match process. It contains invoice and receipt-related conditions relevant to tax review, while the PO-GRN-invoice workflow and tolerances are company controls.
Can three-way matching work for services?
Yes, if the business uses reliable acceptance evidence such as a service-entry sheet, milestone sign-off or approved timesheet in place of a physical-goods GRN.
Should every mismatch block the whole invoice?
Not necessarily. A documented policy may release supported lines and hold only disputed lines, provided tax, system and supplier-credit implications are controlled and the split remains auditable.
Who should approve a match override?
An authorised person independent of the original entry should approve it under a risk-based matrix. The reason, evidence, amount and approving identity should remain in the audit trail.
What comes after three-way matching?
A clean or approved match creates a payable candidate. Payment still needs maker-checker approval, validated beneficiary details, bank execution, UTR capture and subsequent reconciliation.
Sources and further reading
- Central Board of Indirect Taxes and Customs: Tax Invoice, Credit and Debit Notes - Invoice RulesVerified Jul 25, 2026
- Legislative Department, India Code: Central Goods and Services Tax Act, 2017Verified Jul 25, 2026
Educational disclaimer: This material is general information, not legal, tax, or accounting advice. Check current official guidance and your facts with a qualified professional.
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