GSTR-2B is a static, auto-drafted input tax credit statement that fixes the ITC a taxpayer is eligible to claim for a tax period. Since Section 16(2)(aa), ITC in GSTR-3B is restricted to invoices appearing in GSTR-2B, so reconciling the purchase register against 2B every month is essential to avoid lost or disallowed credit.
What GSTR-2B is and why it matters
GSTR-2B is generated on the 14th of each month and, unlike the dynamic GSTR-2A, does not change once generated. It lists ITC available from suppliers' GSTR-1/IFF and GSTR-5/6 filings, classified as available or not available with reasons (for example, supply from a different State, time-barred under Section 16(4), or place of supply in the supplier's State).
Section 16(2)(aa) makes the appearance of an invoice in GSTR-2B a condition for claiming ITC. So your eligible credit is, broadly, the intersection of (a) goods/services actually received, (b) a valid tax invoice, and (c) the invoice reflected in 2B.
A monthly reconciliation method
- Download GSTR-2B (JSON/Excel) for the period from the portal.
- Match against the purchase register on GSTIN + invoice number + invoice value + tax.
- Classify each line: matched, in books not in 2B, in 2B not in books, or value/tax mismatch.
- Claim ITC only for matched and 2B-reflected invoices in GSTR-3B Table 4.
- Park "in books not in 2B" credit; follow up with the supplier to file/amend GSTR-1.
The GST Input Reconciliation tool automates this matching against 2B and the new IMS.
Handling the common mismatch types
| Mismatch | Likely cause | Action |
|---|---|---|
| In books, not in 2B | Supplier missed/late GSTR-1 | Defer ITC; chase supplier; claim when it appears |
| In 2B, not in books | Invoice not booked / wrong GSTIN | Verify and book, or reject in IMS |
| Tax value mismatch | Data entry / amendment | Reconcile to correct figure; claim eligible amount |
| Marked "not available" | Section 16(4) time bar / POS rules | Do not claim; record reason |
The IMS overlay
The Invoice Management System (IMS) lets recipients accept, reject or keep pending each inward invoice, and the accepted invoices flow into GSTR-2B. Used well, IMS reduces reversals and supplier disputes. Pending invoices do not form part of 2B for that month, so a deliberate workflow is needed to avoid permanently parking genuine credit. See IMS invoice matching.
Key takeaways
- GSTR-2B is static and fixes eligible ITC for the period.
- Section 16(2)(aa): ITC is restricted to invoices appearing in 2B.
- Reconcile the purchase register to 2B every month before filing 3B.
- Section 16(4) bars ITC after 30 November of the next financial year.