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Taxation · Returns

GSTR-2A, GSTR-2B and Input Tax Credit Matching

Updated 5 October 2026 · Fact-checked

GSTR-2A is a dynamic, read-only statement of inward supplies that changes as suppliers file. GSTR-2B is a static, monthly auto-drafted ITC statement. You claim ITC in GSTR-3B only for invoices reflected in GSTR-2B, along with Section 16 conditions. Reconcile books to GSTR-2B, claim matched eligible credit, and hold or reverse the rest.

Understand GSTR-2A, GSTR-2B and Input Tax Credit Matching

When your supplier files their outward supply return (GSTR-1 or IFF), the invoice details flow to you. They show up as your inward supplies on the GST portal. You do not type them in. This is the idea behind the auto-generated statements.

GSTR-2A is a dynamic, read-only statement. It keeps updating whenever a supplier files, amends or adds an invoice. It also carries details from other returns, such as those of an Input Service Distributor, TDS and TCS deductors, and import data. Because it keeps changing, two downloads on different days can differ.

GSTR-2B is a static, auto-drafted ITC statement. The portal generates it once for each month, around the 14th of the next month. It does not change after generation. Late filings by suppliers appear in the next month's GSTR-2B. It also tells you which credit is available and which is not available (for example, flagged for Section 17(5) blocked credit), and it covers import of goods and ISD credit.

Why it matters. Section 16(2)(aa) of the CGST Act says you can take ITC on an invoice or debit note only if the supplier has furnished its details in GSTR-1 or IFF and those details are communicated to you in GSTR-2B. Rule 36(4) has been omitted, so it is no longer in force. The old idea of claiming a small percentage of unmatched credit provisionally no longer applies. The Finance Act 2022 changed the machinery sections w.e.f. 1 October 2022. It substituted Section 41, so ITC is now claimed on a self-assessed basis in the return. It omitted Section 41A. It also omitted the old matching and reversal Sections 42, 43 and 43A. Section 38 now deals with communication of details of inward supplies and input tax credit (GSTR-2B).

Remember: matching in GSTR-2B is necessary, not sufficient. You must still satisfy the other Section 16 conditions: you hold a tax invoice or other prescribed document, you received the goods or services, the tax has actually been paid to the Government by the supplier, and you have filed your return. Time limits and reversal rules, such as the 180-day payment rule, also apply.

Key rules to remember

Rule for claiming ITC on invoices
ITC claimed in GSTR-3B = Eligible ITC reflected in GSTR-2B (after Section 16 and 17 checks) + ITC on reverse charge, imports and other items allowed from books
Invoices not in GSTR-2B are not claimed now. Claim them in the month they appear in GSTR-2B, within the Section 16(4) time limit.
GSTR-2A vs GSTR-2B
GSTR-2A = dynamic, read-only, updates continuously | GSTR-2B = static, monthly, generated once
Use GSTR-2B for claiming ITC. Use GSTR-2A to track what suppliers have filed.
Section 16(2)(aa)
ITC allowed only if supplier has furnished invoice details in GSTR-1 or IFF and they are communicated to you in GSTR-2B
Section 16(2)(aa) was inserted by the Finance Act 2021 and took effect from 1 January 2022. Rule 36(4), the earlier provisional-claim limit, was omitted w.e.f. 1 January 2022. The Finance Act 2022 amended Section 16(2)(aa) w.e.f. 1 October 2022 so that it refers to communication of the details in GSTR-2B. From the same date, the Finance Act 2022 substituted Section 41 (self-assessed ITC claim in the return), omitted Section 41A, and omitted Sections 42, 43 and 43A.
Reconciliation
ITC per books − ITC per GSTR-2B = timing differences + ineligible items + RCM and other items not in 2B + errors
Work through each difference. Do not net them off.
Rule 37 reversal for non-payment
ITC to reverse = ITC on the invoice × (Unpaid amount including tax ÷ Invoice value including tax)
Applies when you do not pay the supplier within 180 days from the date of the invoice. Add the amount to your output tax liability in the GSTR-3B for the month immediately following the 180-day period. Interest under Section 50 applies. You can reclaim the credit once you pay.
Time limit for ITC
ITC on an invoice or debit note must be taken by 30 November following the end of the financial year to which the invoice or debit note pertains (the annual-return-filing limb was removed w.e.f. 1 October 2022)
This is the Section 16(4) deadline. The year that counts is the one to which the invoice pertains, not the year of the claim. It applies even if the invoice shows in GSTR-2B late.

How to solve GSTR-2A, GSTR-2B and Input Tax Credit Matching questions

Use this method for any question on GSTR-2A, GSTR-2B, matching or reconciliation.

  1. 1Identify what the question asks: the difference between statements, the ITC to claim for the month, a reconciliation, or a reversal.
  2. 2List every invoice or credit item and note whether it is reflected in GSTR-2B for the month.
  3. 3For items in GSTR-2B, test Section 16 conditions: tax invoice held, goods or services received, tax paid by supplier, return filed, and time limit.
  4. 4Apply Section 17 and blocked credit: remove items under Section 17(5) and apportion for exempt or non-business use if the question gives it.
  5. 5For items not in GSTR-2B, do not claim now. Note they can be claimed in the month they appear, within the Section 16(4) limit.
  6. 6Add items allowed from books even though they are not in GSTR-2B, such as reverse charge ITC, once the conditions are met.
  7. 7Check payment to suppliers within 180 days. If not paid, work out the reversal under Rule 37 and mention interest.
  8. 8State the final ITC claim in GSTR-3B and the action for each difference.

Quickest way: Three-bucket sort for MCQs and written answers

When to use it: Use when you have a list of invoices and must find the ITC claimable for a month, or must pick the correct statement in an MCQ.

  1. Sort each item into one of three buckets: claim now (in GSTR-2B and eligible), claim later (not in GSTR-2B yet), never claim (blocked or conditions failed).
  2. For MCQs, remember GSTR-2A is dynamic and GSTR-2B is static. Eliminate any option that swaps these.
  3. Eliminate options that allow ITC without the invoice appearing in GSTR-2B, except for reverse charge, imports and similar items.
  4. For written answers, use this format: provision, facts, working, conclusion. Write the section or rule, apply it to each invoice, show the total, then state the conclusion in one line.
  5. Show a small table-like list of amounts line by line so the examiner can award step marks even if your final total is wrong.

Common mistakes in GSTR-2A, GSTR-2B and Input Tax Credit Matching

  • Treating GSTR-2A and GSTR-2B as the same statement.

    Both show inward supplies, so they look alike.

    Fix: Remember the key difference: GSTR-2A is dynamic and read-only. GSTR-2B is static and generated once a month. Claim ITC based on GSTR-2B.

  • Claiming ITC on an invoice only because it is in GSTR-2B.

    Students think the statement alone gives the right to credit.

    Fix: Still check Section 16 conditions, blocked credit under Section 17(5), receipt of goods or services, payment within 180 days and the time limit.

  • Writing that Sections 42 and 43 still apply for matching and reversal.

    Older notes and videos still teach the earlier matching process.

    Fix: Say that the earlier matching provisions of Sections 42, 43 and 43A were omitted. ITC now depends on GSTR-2B under Section 16(2)(aa), with Section 38 covering communication of details of inward supplies and ITC.

  • Forgetting reverse charge ITC in the claim.

    GSTR-2B mostly shows supplier-filed invoices, so RCM items are overlooked.

    Fix: Add ITC on reverse charge from books after you have paid the tax and the other conditions are met.

  • Ignoring invoices that appear in GSTR-2B in a later month.

    Students look only at the invoice date month.

    Fix: Claim the credit in the month the invoice appears in GSTR-2B, as long as you are within the Section 16(4) time limit.

  • Reversing the full ITC when only part of the invoice remains unpaid after 180 days.

    Students apply the rule to the entire invoice.

    Fix: Reverse in proportion to the unpaid amount including tax, and reclaim after payment.

Worked examples

Example 1

For a month, ITC per your books is ₹5,40,000. GSTR-2B shows eligible ITC of ₹4,85,000. The difference: (a) invoices with ITC of ₹40,000 are in books but the supplier has not filed GSTR-1; (b) ₹30,000 is reverse charge ITC in books, on which tax has been paid; (c) ₹15,000 is on an eligible invoice in GSTR-2B that is not yet in your books, though you received the goods. You will book this invoice before you file GSTR-3B. Reconcile the figures and state the ITC claimable in GSTR-3B.

Show the solution
  1. Start with GSTR-2B: eligible ITC is ₹4,85,000. This figure already includes the ₹15,000 invoice in (c). Item (c) is in GSTR-2B but not in your books, so the books figure of ₹5,40,000 does not include it.
  2. Reconcile the difference: books ₹5,40,000 − GSTR-2B ₹4,85,000 = ₹55,000. This equals (a) ₹40,000 + (b) ₹30,000 − (c) ₹15,000 = ₹55,000. Items (a) and (b) are in books but not in GSTR-2B, so they widen the gap. Item (c) is in GSTR-2B but not in books, so it narrows the gap.
  3. Check the other way: books ₹5,40,000 + (c) ₹15,000 − (a) ₹40,000 − (b) ₹30,000 = ₹4,85,000, which is the GSTR-2B figure.
  4. Item (a) ₹40,000: not in GSTR-2B, so do not claim now. Follow up with the supplier. Claim when it appears in a later GSTR-2B, within the Section 16(4) limit.
  5. Item (b) ₹30,000: reverse charge ITC is allowed from books because tax has been paid under reverse charge and conditions are met. It is not in GSTR-2B, so add it on top of the GSTR-2B figure.
  6. Item (c) ₹15,000: it is in GSTR-2B, eligible, and the goods are received. It is already part of the ₹4,85,000, so do not add it again. Book the invoice so that your books match the claim.
  7. ITC claimable = ₹4,85,000 (GSTR-2B, including the ₹15,000 invoice) + ₹30,000 (reverse charge) = ₹5,15,000.

Answer: ITC claimable in GSTR-3B is ₹5,15,000: ₹4,85,000 from GSTR-2B (which already includes the ₹15,000 invoice that is in GSTR-2B but not in books, and must be booked) plus ₹30,000 reverse charge ITC. ITC of ₹40,000 is held back until the supplier's invoices reflect in GSTR-2B.

Example 2

A registered person bought goods on 10 June 2026 for ₹1,18,000 including GST of ₹18,000. The invoice reflected in GSTR-2B for June 2026 and the full ITC was claimed. Only ₹59,000 had been paid to the supplier by 7 December 2026, when the 180 days end; the balance remains unpaid. What is the position under Rule 37?

Show the solution
  1. Count 180 days from 10 June 2026: June 20 + July 31 + August 31 + September 30 + October 31 + November 30 = 173 days, plus 7 days in December = 180. The 180 days end on 7 December 2026.
  2. The unpaid amount by then is ₹1,18,000 − ₹59,000 = ₹59,000. The 180 days have lapsed with this balance unpaid, so Rule 37 applies to it.
  3. ITC to reverse = ₹18,000 × (₹59,000 ÷ ₹1,18,000) = ₹18,000 × 0.5 = ₹9,000.
  4. The ₹9,000 is added to output tax liability in the GSTR-3B for the month immediately following the 180-day period. The period ends in December 2026, so this is the GSTR-3B for January 2027.
  5. Interest under Section 50 is payable from the date the credit was availed until the date of reversal.
  6. When you pay the remaining ₹59,000 later, you can reclaim the ₹9,000, subject to the other conditions.

Answer: As ₹59,000 is unpaid when the 180 days end on 7 December 2026, reverse ITC of ₹9,000 in the GSTR-3B for January 2027, the month immediately following the 180-day period, with interest under Section 50. You can reclaim it once the balance payment is made.

Exam tips

  • Write the GSTR-2A vs GSTR-2B difference in two crisp lines (dynamic vs static, read-only vs auto-drafted for ITC claim). This is a common short-answer point.
  • For any ITC question, say Section 16(2)(aa) and GSTR-2B before giving the figure. This earns provision marks.
  • Do not quote Sections 42 and 43 as current law. If a question uses them, state that the matching process was omitted and apply the present rule.
  • In reconciliation questions, list each difference separately with an action: claim, hold, reverse or correct books.
  • In MCQs, watch for options that allow credit for invoices not in GSTR-2B. They are usually wrong unless the item is reverse charge or an import.

Practice questions from Returns

GSTR-2A, GSTR-2B and Input Tax Credit Matching in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

GSTR-2A, GSTR-2B and Input Tax Credit Matching: frequently asked questions

What is the difference between GSTR-2A and GSTR-2B?

GSTR-2A is a dynamic, read-only statement that updates whenever suppliers file or amend their returns. GSTR-2B is a static statement generated once for each month, and it shows the ITC available to you. You rely on GSTR-2B for claiming credit.

Can I claim ITC if the invoice is not in GSTR-2B?

Generally no. Section 16(2)(aa) requires the supplier's details to be furnished and communicated to you in GSTR-2B. Once the invoice appears in a later month's GSTR-2B, you can claim it, within the Section 16(4) time limit.

Do Sections 42 and 43 still apply for ITC matching?

No. The Finance Act 2022 omitted Sections 42, 43 and 43A w.e.f. 1 October 2022. It also omitted Section 41A and substituted Section 41, so ITC is claimed on a self-assessed basis in the return. ITC is now tied to GSTR-2B through Section 16(2)(aa), and Section 38 covers communication of details of inward supplies and ITC.

How do I reconcile GSTR-2B with my books?

Compare invoice-wise ITC in books with GSTR-2B. Separate the differences into timing (supplier not filed), ineligible or blocked credit, reverse charge and other items not in GSTR-2B, and booking errors. Claim what is eligible and follow up on the rest.