Why this reconciliation matters more than it used to
Before Section 16(2)(aa), a business could claim input tax credit based on its own purchase records, provisionally, even where a supplier hadn't yet reported the corresponding sale. That's no longer the case — credit is now tied directly to what appears in GSTR-2B, generated from your suppliers' own GSTR-1 filings. A supplier who files late, incorrectly, or not at all directly reduces the credit you can claim for that period, regardless of whether you've actually paid them and hold a valid invoice.
This makes reconciliation a genuinely two-way exercise: checking that credit you're entitled to actually appears in 2B, and following up with suppliers whose filings are missing or incorrect, since their compliance now directly determines your own cash flow.
What the reconciliation covers
- Invoice-level matching — each purchase invoice in your books checked against a corresponding entry in GSTR-2B.
- Missing invoices — purchases recorded in your books with no matching entry in 2B, indicating a supplier hasn't filed or has filed incorrectly.
- Value or tax-rate mismatches — where an invoice appears in 2B but with a different value or tax amount than your own record.
- Credit notes — checking that credit notes issued by suppliers are correctly reducing the credit claimed, not overlooked.
- Blocked credit under Section 17(5) — confirming that credit genuinely ineligible under the blocked-credit provisions (certain motor vehicles, personal-consumption items, and others) hasn't been claimed in error.
The reconciliation process, step by step
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Extracting the purchase register
All purchases for the period are extracted from the books, with the GSTIN, invoice number and tax amount for each supplier.
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Matching against GSTR-2B
Each purchase is checked against the corresponding entry in GSTR-2B for the period, flagging matches, mismatches and entries with no counterpart at all.
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Following up on gaps
Where an invoice is missing or mismatched, the supplier is contacted to confirm whether they've filed, and if not, when they intend to — since the credit won't be available until they do.
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Finalising the credit claimed
Only credit actually confirmed in GSTR-2B is included in that period's GSTR-3B — anything still pending resolution is tracked forward rather than claimed prematurely.
Practical notes from our engagements
- Reconciliation left until the annual return. Doing this monthly, alongside GSTR-3B, is considerably easier than reconstructing a full year's mismatches in November for a December annual return deadline.
- Suppliers not followed up on missing invoices. A missing entry in 2B isn't automatically resolved by waiting — an active follow-up with the supplier is usually what actually gets it filed.
- Blocked credit claimed by mistake. Credit on certain motor vehicles and personal-consumption items is specifically blocked under Section 17(5), regardless of whether it appears in GSTR-2B — appearing in 2B doesn't automatically make credit eligible.
How we handle reconciliation
We reconcile purchase records against GSTR-2B before finalising each period's GSTR-3B, rather than after — this is what keeps the credit actually claimed defensible if it's ever reviewed. Where suppliers consistently cause mismatches, we flag the pattern to the client, since a small number of unreliable suppliers is often behind a disproportionate share of recurring reconciliation issues.
Related services
Frequently asked questions
What's the difference between GSTR-2A and GSTR-2B?
GSTR-2A updates continuously as suppliers file their returns. GSTR-2B is a fixed, once-a-month statement that is the actual basis for claiming input tax credit for that period.
Can I claim credit that's in my purchase register but not yet in GSTR-2B?
No — under Section 16(2)(aa), credit is available only to the extent it's reflected in GSTR-2B, regardless of what your own books show.
What should I do if a supplier hasn't filed their return?
Follow up with them directly — the credit won't appear in your GSTR-2B, and won't be available to you, until they file.
How often should reconciliation be done?
Ideally every return period, before GSTR-3B is filed — leaving it until the annual return makes a much bigger job out of resolving a year's worth of mismatches at once.
Is all credit that appears in GSTR-2B automatically eligible?
Not necessarily — certain categories are specifically blocked under Section 17(5) regardless of whether they appear in 2B, so reconciliation needs to check eligibility as well as matching.