The 180-Day Vendor Payment Rule : ITC Is Not Always Permanent

“Input tax credit may be claimed today, but vendor payment determines whether it can stay.”

You may have a valid invoice and matching GSTR-2B,and still be required to reverse ITC.

The audit issue

Where the recipient does not pay the supplier the value of supply plus tax within 180 days from the invoice date, proportionate ITC may need to be reversed under Rule 37, subject to the statutory framework and specified exceptions. The credit can generally be re-availed when payment is later made. Businesses miss this because GST review is performed from the purchase register, while the relevant evidence sits in ageing reports and vendor ledgers.

Legal framework

The second proviso to section 16(2) of the CGST Act, read with Rule 37 of the CGST Rules, governs the requirement. Interest consequences must be evaluated under section 50 and the rule applicable to the relevant period. 

What the officer will examine

Officers request invoice-wise creditor ageing and identify balances outstanding beyond 180 days. They examine partial payments, retention money, disputed invoices, year-end provisions, related-party balances, debit balances adjusted by journals and payments made by group entities. A general ledger balance is not enough: the taxpayer must show invoice-level allocation of payment. Officers may also compare reversals reported in GSTR-3B with the ageing population.

What to correct before GSTR-9 and GSTR-9C

Before GSTR-9/9C, run an invoice-wise ageing report from the original invoice date and compute the unpaid proportion including tax. Separate genuine non-payments from advances, net-offs and entries where payment evidence exists. Track reversal, subsequent payment and re-availment through a controlled register so the same credit is neither lost nor reclaimed twice. Document exceptions and retain bank or adjustment evidence. Review old creditors and provisions even if the current-year purchase register is clean.

Closing takeaway

Monthly return filing rarely detects a 180-day breach because it develops over time. An annual ITC review should connect GSTR-2B, the purchase register and accounts payable ageing. That single three-way check can prevent avoidable tax, interest and audit correspondence.

Practical audit scenario

Assume an invoice of Rs. 11.80 lakh, including GST of Rs. 1.80 lakh, remains 40 percent unpaid after 180 days. The control should test the unpaid proportion rather than reverse either nothing or the entire credit. If payment is later completed, the re-availment must be linked to the earlier reversal. Problems multiply when old creditors are settled through debit notes, contra entries or group-company payments that the ageing report does not recognise. An invoice-level register prevents the same amount from being reversed twice or reclaimed without evidence.

The safest approach is to identify and document the issue before the annual return is filed. Once an audit communication is issued, correction options may narrow and every explanation must be supported by records. The review should therefore record the factual position, legal conclusion, amount involved, return impact, corrective action, owner and supporting documents. Material positions should be approved, while immaterial differences should still be catalogued so repeated small errors do not become a pattern across tax periods. This converts a year-end reconciliation into a defensible audit file.

Suggested CTA: Before finalising your annual return, consider an independent GST reconciliation and health check focused on the records an audit officer is most likely to test.

Essential Checks Before You File GSTR-9 & 9C : Part 3

This is Part 3 of our 15-part series uncovering critical GST checks every business should complete before filing GSTR-9 and GSTR-9C or facing a departmental audit. Stay tuned for the next post.

Disclaimer : This article is for informational purposes only and should not be construed as legal or professional advice. Taxpayers should consult their tax advisor based on the facts of their specific case before taking any action.