GST Reconciliation Guide: GSTR-2A vs 2B vs Purchase Register (Step-by-Step)
A practical guide to monthly GST reconciliation — understanding GSTR-2A vs GSTR-2B, how to match ITC with your purchase register, handling supplier mismatches, and staying ITC-safe.
GSTR-2A vs GSTR-2B: The Critical Difference
GSTR-2A is a dynamic, real-time document that shows purchases uploaded by your suppliers in GSTR-1. It keeps updating as suppliers file or amend returns. GSTR-2B is a static, locked document generated on the 14th of each month showing ITC available for that month — based on GSTR-1/IFF filed by suppliers up to 13th. Rule 36(4) now mandates that ITC can only be claimed up to the amount appearing in GSTR-2B (plus a 5% buffer that was later removed). Always use GSTR-2B as the basis for ITC claims in GSTR-3B.
| Feature | GSTR-2A | GSTR-2B |
|---|---|---|
| Nature | Dynamic, keeps updating | Static, locked by 14th |
| Use | Verification and tracking | ITC claim basis in GSTR-3B |
| Update timing | Real-time as suppliers file | Fixed on 14th of each month |
| Legal standing | Informational | Legally determinative for ITC |
Step-by-Step Monthly ITC Reconciliation Process
Follow this process every month before filing GSTR-3B:
- Download GSTR-2B from GST portal for the month
- Export your purchase register from accounting software for the same period
- Match each invoice line: GSTIN, invoice number, invoice date, taxable value, IGST/CGST/SGST
- Identify mismatches: invoices in your books but not in 2B, or in 2B but not in your books
- For invoices in books not in 2B: check if supplier filed GSTR-1, follow up with supplier
- For invoices in 2B not in your books: verify if purchase was made and book if genuine
- Claim ITC only for matched invoices in GSTR-3B
- Document the reconciliation for audit trail
Common Reconciliation Mismatches and How to Handle
Understanding what causes mismatches helps you fix them systematically.
| Mismatch Type | Cause | Action Required |
|---|---|---|
| Invoice in books, not in 2B | Supplier hasn't filed GSTR-1 yet | Follow up with supplier to file GSTR-1 |
| Invoice in 2B, not in books | Purchase recorded in wrong month or not yet recorded | Book the purchase; verify it's a genuine purchase |
| Invoice in both but amount differs | Data entry error in your books or supplier filed wrong value | Verify original invoice; ask supplier to amend if their filing is wrong |
| GSTIN mismatch | Wrong GSTIN on invoice | Ask supplier to issue corrected invoice |
| Invoice dated in previous period appearing now | Supplier filed late | Can claim ITC in current month — check if invoice within 3-year ITC eligibility window |
ITC Reversal Rules You Must Know
Not all ITC in GSTR-2B can be claimed. ITC must be reversed for: (1) Input used for exempt supplies — Rule 42 (proportionate reversal), (2) Personal use or non-business use, (3) Payment not made to supplier within 180 days — must reverse ITC and add back when payment is made, (4) Blocked credits under Section 17(5) — motor vehicles, food, club membership, etc., (5) Capital goods used for exempt supply — Rule 43 reversal.
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