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Taxation · Input Tax Credit

Documentary Requirements, Matching and Reclaim of ITC

Updated 4 October 2026 · Fact-checked

To claim ITC you need a valid document such as a tax invoice, the supplier's details showing in your GSTR-2B, receipt of the goods or services, tax actually paid to the government and a filed return. If you do not pay the supplier within 180 days of the invoice date, reverse the credit with interest and reclaim it after payment.

Understand Documentary Requirements, Matching and Reclaim of ITC

ITC is not a right you get just because you paid GST to a supplier. Section 16 makes it a conditional benefit. You must hold the right document, the supplier must report the supply, you must receive the goods or services, and the tax must reach the government.

Documents (Rule 36). The usual document is the supplier's tax invoice. Other valid documents include a debit note, a bill of entry for imports, an invoice issued by an Input Service Distributor, and, for reverse charge on supplies from an unregistered person, the self-invoice with payment voucher. A credit note reduces your credit.

Matching. Your supplier reports the sale in GSTR-1 or IFF. The portal puts it in your auto-drafted statement, GSTR-2B. Under section 16(2)(aa), you can claim ITC only if the invoice or debit note details appear there. GSTR-2B is fixed for each month. It does not change after it is generated.

Provisional credit. Earlier, Rule 36(4) allowed a limited amount of ITC on invoices not yet reported by the supplier. That rule was omitted from 1 January 2022. Now there is no provisional credit. ITC is either matched and allowed, or you wait until the supplier reports it.

Non-payment to supplier. If you do not pay the supplier (value plus tax) within 180 days from the date of the invoice, you must add the ITC to your output tax liability with interest under section 50. This is done under Rule 37. When you later pay, you can reclaim that credit. The interest paid is not refunded. This rule does not apply where tax is payable under reverse charge.

Key rules to remember

Conditions for ITC (section 16(2))
Document + supplier's details in GSTR-2B + receipt of goods/services + tax paid to government + return filed
All conditions must be met. Failing any one defeats the claim for that invoice.
Time limit (section 16(4))
Claim by 30 November following the end of the financial year to which the invoice or debit note pertains
The time limit runs from the financial year of the invoice, not the date you received it.
180-day rule (Rule 37)
Reverse ITC if supplier is not paid within 180 days from the date of invoice
Does not apply to supplies on which you pay tax under reverse charge.
Amount to reverse for part payment
ITC reversed = ITC on invoice × (Unpaid amount including tax ÷ Total invoice value including tax)
If you have paid part, reverse only the proportionate credit on the unpaid portion.
Interest on reversal
Interest = ITC reversed × 18% × Days ÷ 365
Counted from the date you availed the credit to the date you reverse it. Rate is 18% per annum under section 50(1).
Reclaim
ITC reversed under Rule 37 can be re-availed after you pay the supplier
Claim it again in the return for the period of payment. Interest paid earlier is not refunded.
Provisional credit
Rule 36(4) omitted from 1 January 2022
Invoices not reported by the supplier give no credit at all until they appear in GSTR-2B.

How to solve Documentary Requirements, Matching and Reclaim of ITC questions

Use this order for any question on documents, matching or reversal of ITC.

  1. 1List each invoice with its date, taxable value, GST and whether it is in GSTR-2B.
  2. 2Check the document. Is it a valid one, such as a tax invoice, debit note, bill of entry, ISD invoice or self-invoice for reverse charge?
  3. 3Check the other section 16(2) conditions: details in GSTR-2B, goods or services received, tax paid to government, return filed.
  4. 4Check the time limit under section 16(4) for each invoice. It is 30 November following the end of the financial year of the invoice.
  5. 5Check the payment to the supplier. If more than 180 days have passed from the invoice date and the supplier is unpaid, find the unpaid part.
  6. 6Compute the reversal using the proportion of unpaid amount, then compute interest at 18% for the days from availing to reversal.
  7. 7State what can be reclaimed and when, and mention that interest is not refunded.
  8. 8Write a conclusion for each invoice: eligible, deferred, or reversed.

Quickest way: Invoice-wise tick and 180-day count

When to use it: Use this in MCQs and in short written answers where several invoices or dates are given.

  1. MCQ: look first for the missing condition. Not in GSTR-2B, goods not received or the 180 days has passed are the usual traps. Eliminate options that allow credit anyway.
  2. Remember that provisional credit under Rule 36(4) no longer exists. Reject options that allow a 5% or 10% provisional claim.
  3. For the 180-day test, count days from the invoice date and not from the date of receipt or entry in books.
  4. Part payment: reverse only the ITC on the unpaid portion, calculated as a proportion of the invoice value including tax.
  5. Written answers: use a small table style, with one line per invoice stating the condition, the finding and the credit allowed. Cite section 16(2) and Rule 37 so you earn step marks.

Common mistakes in Documentary Requirements, Matching and Reclaim of ITC

  • Claiming ITC on an invoice that is not in GSTR-2B because it is in the purchase books.

    Students remember the old provisional credit rule or think possession of the invoice is enough.

    Fix: Since section 16(2)(aa), details must appear in GSTR-2B. Allow credit only on matched invoices and defer the rest.

  • Allowing ITC when the invoice is in GSTR-2B but the goods were not received.

    Students rely on the portal match and forget the receipt condition.

    Fix: Check all conditions. Receipt of goods or services under section 16(2)(b) is separate from matching.

  • Counting the 180 days from the date of receipt of goods or the date of booking.

    Students assume the clock starts when the purchase is recorded.

    Fix: Count from the date of the invoice issued by the supplier.

  • Reversing the full ITC when only part of the invoice is unpaid.

    Students apply the 180-day rule to the invoice as a whole.

    Fix: Reverse only the proportion that relates to the unpaid amount, including tax.

  • Expecting refund of the interest when reclaiming ITC after paying the supplier.

    Students treat reversal and reclaim as an exact undo.

    Fix: Only the credit can be reclaimed. The interest paid on reversal is a cost.

  • Applying the 180-day reversal to reverse charge supplies.

    Students apply the rule to every purchase.

    Fix: The condition applies to supplies where the recipient pays the supplier. It does not apply where tax is paid under reverse charge.

Worked examples

Example 1

X Ltd purchased goods on 10 June 2026 under an invoice of ₹2,36,000 (taxable value ₹2,00,000 plus GST at 18%, ₹36,000). It availed the full ITC on 20 July 2026. It paid ₹1,18,000 on 5 December 2026 and nothing more by 7 December 2026. Assume X Ltd reverses on 20 January 2027. Compute the ITC to be reversed and the interest. Also state the treatment when the balance is paid later.

Show the solution
  1. The 180 days from 10 June 2026 end on 7 December 2026. The balance is still unpaid, so Rule 37 applies to the unpaid part.
  2. Unpaid amount including tax = ₹2,36,000 − ₹1,18,000 = ₹1,18,000. That is 50% of the invoice value.
  3. ITC to reverse = ₹36,000 × 1,18,000 ÷ 2,36,000 = ₹18,000.
  4. Interest period = 20 July 2026 to 20 January 2027 = 184 days (153 days to 20 December plus 31 days to 20 January).
  5. Interest = ₹18,000 × 18% × 184 ÷ 365 = ₹1,633 (rounded).
  6. When X Ltd pays the balance, it can reclaim the ₹18,000 in the return for that period. The interest of ₹1,633 is not refunded.

Answer: Reverse ITC of ₹18,000 with interest of about ₹1,633. Reclaim ₹18,000 on payment of the balance. The interest is not refunded.

Example 2

For October 2026, Y Traders' books show three purchase invoices carrying GST: Invoice A ₹90,000, Invoice B ₹70,000 and Invoice C ₹1,40,000. GSTR-2B for October 2026 shows A and C only. The supplier of B has not filed GSTR-1. Goods under Invoice C have not been received, as the transporter is delayed. All other conditions are met and none of the credits is blocked. Find the ITC Y Traders can claim for October 2026 and say what happens to the rest.

Show the solution
  1. Invoice A: valid document, shown in GSTR-2B and goods received. ITC of ₹90,000 is allowed.
  2. Invoice B: the supplier has not reported it, so it is not in GSTR-2B. Section 16(2)(aa) is not met. ITC of ₹70,000 cannot be claimed now. There is no provisional credit, as Rule 36(4) was omitted from 1 January 2022.
  3. Invoice C: shown in GSTR-2B but goods not received. Section 16(2)(b) is not met. ITC of ₹1,40,000 cannot be claimed now.
  4. Total allowed for October 2026 = ₹90,000.
  5. Invoice B can be claimed in the month it appears in GSTR-2B and Invoice C when the goods are received. Both claims must fall within the section 16(4) time limit, which is 30 November following the end of the financial year of the invoice.

Answer: Y Traders can claim ₹90,000 for October 2026. The ₹70,000 on B and ₹1,40,000 on C are deferred until the conditions are met, within the section 16(4) time limit.

Exam tips

  • Write the section 16(2) conditions as a short list at the start of any descriptive answer, then apply them invoice by invoice.
  • In numerical questions on Rule 37, show the 180-day date, the unpaid proportion, the reversal and the interest as separate lines for step marks.
  • Watch the dates. Many questions check whether you count from the invoice date and whether the section 16(4) deadline has passed.
  • In MCQs, any option giving provisional credit or credit without GSTR-2B matching is wrong. Eliminate it quickly.
  • Remember that GSTR-2B is a static monthly statement and that credit on a late-reported invoice is taken in the month it appears.

Practice questions from Input Tax Credit

Documentary Requirements, Matching and Reclaim of ITC: frequently asked questions

Is ITC allowed if the supplier has not filed GSTR-1?

No. Under section 16(2)(aa), the invoice details must be furnished by the supplier and communicated to you, which shows in GSTR-2B. Until it appears, you cannot claim credit. You can claim it in a later month when it appears, within the section 16(4) time limit.

What is the difference between ITC and provisional credit?

ITC is credit allowed after all section 16 conditions are met, including matching with GSTR-2B. Provisional credit was a limited credit allowed on unmatched invoices under Rule 36(4). That rule was omitted from 1 January 2022, so provisional credit no longer exists.

What happens if I do not pay my supplier within 180 days?

You must reverse the ITC on the unpaid amount and pay interest at 18% per annum from the date of availing credit to the date of reversal. This applies under section 16(2) and Rule 37. It does not apply where you pay tax under reverse charge.

Can I reclaim ITC after reversing it for non-payment?

Yes. Once you pay the supplier, you can re-avail the credit. The interest you paid on the reversal is not refunded.