180-Day Vendor Payment Rule: ITC Reversal and Reclaim Checklist
A payable-ledger control for the 180-day condition, partial payment, retention, disputes, related parties, reversal with interest and later re-availment.
The 180-day rule is measured invoice by invoice. A healthy total vendor balance does not prove that a specific invoice and tax were paid within time.
The second proviso to section 16(2) and rule 37 require reversal where the recipient fails to pay the supplier the value plus tax within 180 days, subject to the statutory exceptions.
The current rule requires proportionate reversal for the unpaid amount and interest under section 50.
Credit can be re-availed after payment to the supplier, subject to the governing law.
Supplies liable to reverse charge and specified deemed-paid situations require separate treatment.
What the business should understand
- The second proviso to section 16(2) and rule 37 require reversal where the recipient fails to pay the supplier the value plus tax within 180 days, subject to the statutory exceptions.
- The current rule requires proportionate reversal for the unpaid amount and interest under section 50.
- Credit can be re-availed after payment to the supplier, subject to the governing law.
- Supplies liable to reverse charge and specified deemed-paid situations require separate treatment.
- Commercial retention, quality disputes, netting and related-party accounting should be tested against actual payment and the statutory rule.
The five-point review
| Check | What to examine |
|---|---|
| Invoice | Date, taxable value and GST. |
| Payment | Cash, bank, adjustment or legally recognised settlement. |
| Balance | Partial payment, retention and credit note. |
| Deadline | 180th day and return period for reversal. |
| Reclaim | Payment date, evidence and credit posting. |
Practical example
A contractor invoice is ₹11.8 lakh including GST. The customer pays ₹8 lakh and retains ₹3.8 lakh beyond 180 days. The reversal should be proportionate to the unpaid value and tax rather than the entire credit or no credit.
How to apply the framework
Build invoice-level ageing from accounts payable, not vendor-level ageing. Match payments to invoices using a documented rule.
Separate bona fide credit notes from unpaid invoices. Where invoices are disputed, decide whether to reverse pending resolution instead of allowing silent interest exposure.
Decision workflow
Define the legal question before changing the return
Identify the GSTIN, tax period, transaction, document and exact statutory question. Review invoice, payment and balance together. Freeze the source data so that later ERP edits do not destroy the evidence used for the decision.
Reconcile from commercial reality to portal data
Start with the contract or commercial event. Move through the invoice, receipt or movement evidence, e-invoice or e-way bill, accounting entry, return and electronic ledger. Classify each difference as timing, error, ineligible amount, statutory exception, disputed position or completed correction. Avoid a plug entry whose only purpose is to make two reports equal.
Record the conclusion and future control
Prepare a concise position note with facts, authority, amount, alternative view and approval. Preserve the filing acknowledgement and update the responsible master data, vendor rule, invoice workflow or monthly checklist. The objective is not only to survive one review but to prevent the same issue in the next period.
Action checklist
- Run 150-day and 175-day alerts.
- Map payments invoice-wise.
- Calculate proportionate reversal.
- Pay applicable interest.
- Re-avail after payment.
- Reconcile AP, ITC register and GSTR-3B.
Evidence to keep
- Vendor invoice
- Payment allocation
- AP ageing
- Rule 37 reversal working
- Reclaim and supplier payment proof
Warning signs
- Vendor total balance used as test
- Retention ignored
- Reversal without interest review
- Reclaim before payment
- Old unpaid invoices hidden by advances
Finin2min takeaway
GST positions are strongest when the transaction, legal provision, invoice, physical or service evidence, books, return and electronic ledger agree. A portal match without commercial evidence is not a complete control.