ITC reconciliation between your purchase register and GSTR-2B is now mandatory — you cannot claim ITC on invoices not reflected in GSTR-2B (Section 16(2)(aa)). This guide covers the step-by-step reconciliation process, mismatch resolution, and best practices.
Login → Returns → GSTR-2A (dynamic) or GSTR-2B (static, auto-generated on 14th of every month). Download JSON/Excel for the period. GSTR-2B is the recommended reference as it is finalized and does not change after generation.
Export your purchase register with: supplier GSTIN, invoice number, invoice date, taxable value, CGST, SGST, IGST amounts. Ensure invoice numbers match exactly (leading zeros, special characters matter). Map to the same period as GSTR-2B.
Compare each purchase invoice with GSTR-2B data on: GSTIN, invoice number, invoice date, and tax amounts. Invoices matching on all parameters = 'Matched'. This is typically 70-85% of invoices. Mark these as reconciled.
Remaining invoices fall into: (a) In books but NOT in 2B — supplier hasn't filed, (b) In 2B but NOT in books — unrecorded purchase, (c) Value mismatch — amounts differ, (d) Invoice number mismatch — formatting differences (e.g., INV-001 vs INV/001).
For each mismatch: contact supplier to file/correct return, correct your own books if error is yours, reconcile invoice number formats, escalate persistent mismatches. Set a monthly review cycle — don't wait until annual return.
Section 36 + Rule 36(4): ITC is restricted to invoices reflected in GSTR-2B. Excess ITC (claimed but not in 2B) must be reversed. The 5% provisional ITC rule was removed effective January 2022 — now 100% must match.
| Mismatch Type | Cause | Action | Risk |
|---|---|---|---|
| Missing in GSTR-2B | Supplier has not filed GSTR-1/IFF | Contact supplier immediately. Follow up before due date. If chronic: consider changing supplier or withholding payment. | High |
| Missing in Purchase Register | Purchase not recorded in books / late invoice receipt | Record the purchase in books. Verify if goods/services were actually received. If valid: book and claim ITC. | Medium |
| Value Mismatch | Credit note not applied, rounding difference, tax rate dispute | Verify invoice copy. Check for credit/debit notes. If < ₹100 difference: may be rounding. If significant: contact supplier. | Medium |
| Invoice Number Mismatch | Formatting difference (INV-001 vs INV001 vs INV/001) | Standardize invoice number format in ERP. Contact supplier to match. System-level fix: normalize before comparison. | Low |
| GSTIN Mismatch | Supplier has multiple GSTINs / wrong GSTIN on invoice | Verify supplier GSTIN on invoice vs GSTR-2B. Get revised invoice if wrong GSTIN. Check inter-state vs intra-state supply. | High |
GSTR-2A is a dynamic, real-time view of ITC based on suppliers' filings — it changes as suppliers file/amend returns throughout the month. GSTR-2B is a static statement auto-generated on the 14th of each month based on GSTR-1/IFF filed up to the 13th. GSTR-2B is the recommended reference for ITC claims because it is frozen and doesn't change. Since January 2022, ITC eligibility is determined based on GSTR-2B (Section 16(2)(aa)).
No, not anymore. From January 2022, Section 16(2)(aa) requires that ITC can only be claimed if the invoice appears in GSTR-2B. The earlier provision allowing 5% provisional ITC (on invoices not in GSTR-2A) was removed. If your supplier has not filed GSTR-1, the invoice won't appear in your GSTR-2B, and you cannot claim ITC. You must follow up with the supplier to file their return.
Monthly — ideally between the 14th (when GSTR-2B is generated) and 20th (GSTR-3B due date). This gives you 6 days to: (1) Download GSTR-2B, (2) Compare with purchase register, (3) Identify mismatches, (4) Contact suppliers for corrections, (5) File GSTR-3B with correct ITC. Annual reconciliation during GSTR-9 is too late — you'll have accumulated mismatches that are harder to resolve.
Excess ITC (claimed in GSTR-3B but not supported by GSTR-2B) will be flagged by the GST system. You may receive a DRC-01C notice requiring explanation. You must either: (a) Get the supplier to file their GSTR-1 so the invoice appears in GSTR-2B, (b) Reverse the excess ITC in the next GSTR-3B with interest under Section 50. Failure to reverse may lead to demand notice under Section 73/74.
Credit notes issued by suppliers appear as negative entries in GSTR-2B. Your ITC is reduced by the credit note amount. Ensure: (1) Credit notes are recorded in your books, (2) They match GSTR-2B entries, (3) Your GSTR-3B reflects the net ITC (after credit note reduction). If a supplier issues a credit note but doesn't report it in GSTR-1: you'll have excess ITC — reverse it proactively to avoid interest.
Auto-match GSTR-2B with your purchase register. Instant mismatch detection, supplier follow-up, and GSTR-3B-ready ITC figures.
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