GST & Indirect Tax

GST Rule 37 ITC Reversal for Non-Payment to Vendors: Return, ITC and Notice Checklist

Finin2min GST Desk·June 2026·8 min read·Reviewed 19 June 2026RULE 37

GST ITC is not safe just because the invoice is valid and appears in GSTR-2B. If vendor payment is not made within the specified period, Rule 37 can require reversal/payment of the ITC linked to the unpaid amount.

For the connected rule, example or next step, see GST on Employee Recoveries and Notice Pay: Return, ITC and Notice Checklist.

Finin2min answer: Rule 37 deals with non-payment of value plus tax within 180 days where the statutory payment condition applies. The reversal should follow the unpaid portion rather than treating every overdue invoice as an all-or-nothing vendor block, and eligible credit may be re-availed after payment. RCM supplies have a specific exception to the 180-day consideration condition.

The Official ITC Test: Start With Section 16

GST input tax credit is not an automatic reimbursement of every GST-charged bill. Section 16 of the CGST Act allows a registered person to take credit of input tax on goods or services used, or intended to be used, in the course or furtherance of business, subject to conditions and restrictions. The practical checklist therefore starts with business use, valid tax invoice/debit note, receipt of goods or services, supplier reporting in outward supplies so it is communicated to the recipient, tax payment to Government and return filing.

For the connected rule, example or next step, see GST for Advertising Agencies and Media Buying: Return, ITC and Notice Checklist.

ITC gate	What to verify	Evidence to keep
Business use	Expense is used or intended for business	PO, contract, campaign brief, asset register, cost centre approval.
Document	Invoice/debit note or other prescribed document exists	Tax invoice with supplier GSTIN, recipient GSTIN, tax, value and place-of-supply details where relevant.
Receipt	Goods/services have been received	GRN, service acceptance, delivery proof, project completion note.
Supplier reporting	Invoice appears/communicates through GST system, especially GSTR-2B control	GSTR-2B extract and vendor follow-up trail.
Restrictions	Section 17 blocked-credit and apportionment rules do not deny/restrict credit	Blocked-credit review checklist and reversal working.

⚠ Practical caution: Do not decide ITC only from the accounting ledger description. The same word — marketing, travel, rent, food or equipment — can be eligible, restricted or blocked depending on facts, contract, recipient, usage and Section 17 exceptions.

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GST Rule 42 Common ITC Reversal Calculator

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The 180-Day Vendor Payment Rule

The second proviso to Section 16(2), read with Rule 37, addresses cases where a recipient has availed ITC but fails to pay the supplier the value of supply along with tax within 180 days from the invoice date. Rule 37 requires reversal/payment of ITC proportionate to the amount not paid, along with interest mechanics, while furnishing the return for the tax period immediately following the 180-day period. If payment is later made to the supplier, the credit can be re-availed as per the rule framework.

For the connected rule, example or next step, see GST ITC Reversal and Reclaim Register: A Monthly Control for Rule 37, Rule 42/43 and Temporary Reversals.

Situation	Rule 37 impact	Finance control
Invoice fully paid within 180 days	No Rule 37 reversal on payment timing	Keep payment proof mapped to invoice.
Invoice partly unpaid	Proportionate ITC linked to unpaid amount needs review	Maintain unpaid ageing with GST amount.
Supplier paid after reversal	Credit may be re-availed after payment	Track reversal and re-availment separately.
RCM supplies	Rule 37 excludes supplies on which tax is payable under reverse charge	Tag RCM separately in AP ageing.
Deemed additions under Section 15(2)(b)	Certain added amounts are deemed paid for Rule 37 purpose	Review with contract and valuation working.

AP Ageing Report Columns to Add

Supplier GSTIN and invoice number/date.
Taxable value and GST amount.
Amount paid against invoice, not only vendor balance.
180-day due date from invoice date.
Rule 37 status: no action / reverse / re-avail after payment.

⚠ Practical caution: Do not net off advances, debit notes and unrelated supplier balances casually. Rule 37 should be tracked invoice-wise or with a defensible mapping.

Official References Used

This article uses official GST law, GST rules, GST portal and CBIC/GST Council sources only. Notifications, circulars, rule text and portal workflows can change after this article’s last-reviewed date — verify against the current official source before relying on it.

Rule 37 — payables ageing must drive proportionate ITC control

Decision table

Situation	2026 treatment / control	Why it matters
Fully unpaid after 180 days	Reverse the ITC attributable to the unpaid amount as required.	Track interest under current rule/section.
Part-paid invoice	Compute proportionate unpaid value/tax consequence.	Do not reverse an unrelated paid portion.
Payment later made	Re-avail eligible credit subject to law and return mechanics.	Maintain a re-availment register.
RCM supply	180-day consideration condition has a specific exception.	Do not apply ordinary Rule 37 mechanically.

Worked practical example

Invoice value plus tax is ₹1.18 lakh and ₹59,000 is paid within 180 days. The control should work from the unpaid proportion and current Rule 37 mechanics, not simply reverse 100% because the invoice remains partly open.

Evidence checklist

invoice date
vendor ledger ageing
payment proof
ITC availed/reversed/re-availed register
interest working

Primary-source checks: CBIC ITC Rules · CBIC CGST Act

Use this with the original article: this module tightens current-law, edge-case and evidence controls; it does not replace the article's existing explanation or your fact-specific professional review.

Frequently Asked Questions

What is Rule 37 under GST? ▼

It deals with reversal/payment of ITC where the recipient does not pay the supplier value plus tax within the specified 180-day timeline, subject to exclusions and details in the rule.

Can ITC be re-availed after paying the vendor? ▼

Yes, Rule 37 allows re-availment when payment is subsequently made to the supplier.

Does Rule 37 apply to RCM invoices? ▼

The rule excludes supplies on which tax is payable under reverse charge basis.

Source and review trail

Use the current official instrument, portal or regulator publication before acting. This panel separates the category authority from page-specific references.

Primary category: GST & Indirect Tax
Official starting point: www.gst.gov.in

Page source links

Primary sources & related provisions

Statutory provisions referenced in this guide: