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GST · Input tax creditGSTR-2B vs purchase register: step-by-step reconciliation
Your ITC in GSTR-3B must match what is available in GSTR-2B. A monthly reconciliation with the purchase register catches missing invoices, wrong GSTINs and supplier defaults before they become notices. Here is a step-by-step method.
GSTR-2B is a static, auto-drafted monthly statement of ITC available to you, based on what your suppliers reported. The purchase register in your books shows what you actually bought. Under Rule 36(4), ITC can be claimed only on invoices in GSTR-2B, so the two must be reconciled every month.
The monthly cycle
| Date | Event |
|---|---|
| 11th / 13th | Suppliers file GSTR-1 / IFF |
| Before 14th | You review invoices in IMS – accept, reject or keep pending |
| 14th | GSTR-2B generated |
| 14th–20th | Reconcile 2B with purchase register; decide ITC |
| 20th | File GSTR-3B with ITC as per reconciliation |
Step-by-step method
- Download GSTR-2B (Excel/JSON) and your purchase register for the month.
- Standardise fields: supplier GSTIN, invoice number (remove spaces, prefixes), invoice date, taxable value, IGST/CGST/SGST.
- Match on GSTIN + invoice number; then on GSTIN + value where invoice numbers are formatted differently.
- Classify each line: - Matched – claim. - In books, not in 2B – follow up with supplier; defer ITC. - In 2B, not in books – check receipt; if not received, reject in IMS. - Value/tax mismatch – correct whichever side is wrong. - Wrong GSTIN / State – ask supplier to amend. - Blocked credit (17(5)) – do not claim even if in 2B.
- Decide ITC for GSTR-3B: matched and eligible amounts only.
- Track deferred invoices in a carry-forward list until claimed or abandoned (time limit 30 November).
Worked example
Example: Brightpath Services Pvt Ltd (Ghaziabad) reconciles October 2026:
| Category | Invoices | ITC |
|---|---|---|
| Matched | 86 | ₹4,82,000 |
| In books, not in 2B (supplier yet to file) | 5 | ₹38,000 |
| In 2B, not in books (wrong buyer GSTIN by supplier) | 2 | ₹12,600 |
| In 2B – blocked (food and car insurance) | 3 | ₹9,400 |
| Value mismatch (supplier reported ₹1,00,000 instead of ₹10,000) | 1 | ₹16,200 in 2B vs ₹1,800 in books |
ITC claimed in October GSTR-3B: ₹4,82,000 + ₹1,800 (correct value of the mismatched invoice) = ₹4,83,800. Follow-ups: chase five suppliers; ask one supplier to amend the value; reject two wrong-GSTIN invoices in IMS; ignore blocked credit.
If Brightpath had claimed the full 2B figure without review, it would have over-claimed about ₹36,400 – a likely DRC-01C trigger.
Tools
- Excel with VLOOKUP/XLOOKUP or Power Query.
- Accounting software features (Tally, Busy, Zoho have GSTR-2B reconciliation modules).
- GSP/ASP tools for large volumes.
Supplier follow-up
Keep a supplier scorecard: filing regularity, errors and delays. Withhold the GST portion of payment until the invoice appears in 2B for repeat defaulters – a common commercial practice that also protects you under Section 16(2)(c).
DRC-01C intimations
If ITC claimed exceeds 2B ITC by more than the threshold, an intimation under Rule 88D arrives. Reply within 7 days with reconciliation, or reverse through GSTR-3B/DRC-03. Not replying can block GSTR-1 filing.
Annual view
Before 30 November, prepare a year-wise list of deferred invoices – claim those now in 2B, and write off the rest. GSTR-9 Table 8 compares ITC in 2B with ITC claimed; large differences invite ASMT-10.
Common mistakes
- Claiming ITC based on purchase register instead of 2B.
- Not using IMS and letting wrong invoices flow into 2B.
- Claiming blocked credits because they appear in 2B.
- Losing track of deferred invoices until after 30 November.
Key takeaway
Reconcile GSTR-2B with your purchase register every month before filing GSTR-3B, act in IMS before the 14th, and chase suppliers early. Our GST return service includes monthly 2B reconciliations and supplier follow-up lists.
Official references
Provisions discussed (summaries in our Law Library):
- CGST Rules, 2017 – Section 36(4): ITC limited to GSTR-2B
Official sources to verify the current text, notifications and circulars:
Frequently asked questions
When is GSTR-2B generated?
On the 14th of the following month, based on suppliers' GSTR-1/IFF filed up to the cut-off and the recipient's actions in the Invoice Management System (IMS).
What is DRC-01C?
An intimation under Rule 88D when ITC claimed in GSTR-3B exceeds ITC available in GSTR-2B beyond a prescribed limit. You must reverse the excess or explain the difference.
What should I do if an invoice is in my books but not in GSTR-2B?
Do not claim ITC yet. Ask the supplier to report it in GSTR-1/IFF; claim in the month it appears in GSTR-2B, within the 30 November time limit.
What if GSTR-2B shows an invoice I never received?
Reject it in IMS (or do not claim it) and inform the supplier to correct their GSTR-1. Claiming it would be wrongful ITC.
Is GSTR-2A still relevant?
GSTR-2A is dynamic and useful for tracking, but ITC eligibility is tested against GSTR-2B (static) under Rule 36(4).
What does 'pending' in IMS mean for ITC?
Invoices kept pending do not flow into the month's GSTR-2B; they can be accepted later, subject to time limits.
How long should reconciliation records be kept?
At least 72 months from the due date of the annual return, along with books and returns.
This article is general information on the law as on 10 November 2026, written for educational purposes. It is not professional advice for your case. Section numbers under the Income-tax Act, 2025 should be confirmed with the official section mapping on the Income Tax Department website before use in filings.
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