One of the most important and frequently overlooked ITC compliance requirements is the reversal of ITC when payment to the supplier exceeds 180 days. Rule 37 governs this provision, and it is one of the most common audit findings and notice triggers.
This comprehensive guide explains Rule 37, the calculation methodology, reclaim process, and practical compliance requirements.
What Is Rule 37?
Rule 37 of the CGST Rules provides for the reversal of Input Tax Credit (ITC) in cases where the recipient fails to pay the supplier (value + tax) within 180 days from the invoice date.
The Trigger
- ITC is claimed on an invoice
- The value of supply plus GST is not paid to the supplier within 180 days from the invoice date
The Consequence
- The ITC claimed must be reversed (along with interest under Section 50)
- The reversal must be done in the return for the period in which the 180-day period ends
The 180-Day Rule: Section 16(2)(c) Proviso
The Rule
Section 16(2)(c) requires that the tax charged on the supply must be actually paid to the government by the supplier. The proviso to Section 16(2) states:
"If the recipient of the goods or services fails to pay to the supplier of such goods or services, the amount towards the value of supply along with tax payable thereon, within a period of one hundred and eighty days from the date of issue of invoice, then the amount of ITC claimed in the return as per the details furnished under Section 39 shall be added to the output tax liability of the recipient along with interest."
The Obligation
- The recipient must reverse the ITC if payment is not made within 180 days
- The reversal must be done with interest under Section 50
How to Calculate 180 Days
Counting the Days
- Start counting from the invoice date (not the date of receipt of goods)
- Count 180 calendar days
- If the 180th day falls on a holiday, the deadline is not extended
Example
- Invoice date: 1 April 2026
- 180th day: 28 September 2026
- If payment is not made by 28 September 2026, ITC must be reversed
ITC Reversal Under Rule 37: Step-by-Step
Step 1: Identify Invoices Exceeding 180 Days
- Review the purchase register
- Identify invoices where payment has not been made within 180 days
Step 2: Calculate ITC to Be Reversed
- For each invoice, calculate the ITC amount
- Total the ITC to be reversed
Step 3: Reverse ITC in GSTR-3B
- Reverse the ITC in the return for the period in which the 180-day period ends
- Report the reversal in Table 4(B)(2) of GSTR-3B
Step 4: Calculate Interest
- Interest under Section 50 applies from the date ITC was claimed to the date of reversal
- Interest rate: 18% per annum
Step 5: Pay the Reversed ITC and Interest
- Pay the reversed ITC and interest through the electronic cash ledger
- ITC balance cannot be used to pay this liability
Reclaim of Reversed ITC Under Rule 37
When Can ITC Be Reclaimed?
Once payment is made to the supplier, the reversed ITC can be reclaimed.
The Process
- Pay the supplier the value of supply plus GST
- Claim ITC in the GSTR-3B for the period when payment is made
Time Limit
The normal time limit for claiming ITC under Section 16(4) does not apply to this re-availment. Even a credit reversed long ago can be reclaimed once the bill is settled.
Rule 37: Practical Example
Scenario: ABC Traders purchases goods from XYZ Suppliers on 1 April 2026. Invoice value: ā¹1,00,000 + GST ā¹18,000. ABC Traders claims ITC of ā¹18,000.
180 Days: 28 September 2026.
Payment: ABC Traders does not pay XYZ Suppliers by 28 September 2026.
Reversal: ABC Traders reverses ITC of ā¹18,000 in GSTR-3B for September 2026. Interest is also paid.
Payment: ABC Traders pays XYZ Suppliers on 1 December 2026.
Reclaim: ABC Traders reclaims ITC of ā¹18,000 in GSTR-3B for December 2026.
Rule 37: Compliance Checklist
- Review purchase register monthly for invoices exceeding 180 days
- Reverse ITC in the period when 180 days expire
- Pay interest under Section 50
- Reclaim ITC when payment is made to the supplier
- Maintain documentation of payment and reclaim
Common Mistakes to Avoid
1. Not Reversing ITC Within 180 Days
If payment is not made within 180 days, ITC must be reversed. Failure to reverse leads to interest and penalties.
2. Counting 180 Days from Date of Receipt
The 180-day period is counted from the invoice date, not the date of receipt.
3. Not Paying Interest
Interest under Section 50 applies from the date ITC was claimed to the date of reversal.
4. Forgetting to Reclaim ITC
Once payment is made, the reversed ITC can be reclaimed. Don't forget to reclaim.
5. Not Maintaining Documentation
Proper documentation is essential to prove compliance and support the reclaim.
Part Payment and Rule 37
The Rule
If part payment is made, ITC must be reversed proportionately for the unpaid portion.
Example
- Invoice value: ā¹1,00,000 + GST ā¹18,000
- Payment made: ā¹50,000 (excluding GST) within 180 days
- Unpaid portion: ā¹50,000 + GST ā¹9,000
- ITC to be reversed: Proportionate ITC on unpaid portion
Need help with Rule 37 ITC reversal and reclaim? Our expert team provides comprehensive advisory to ensure accurate compliance.
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