GSTR-2B is the starting point of every monthly input tax credit (ITC) close, but it cannot replace the purchase register or the legal eligibility test. The GST Portal's GSTR-2B Advisory describes it as an auto-drafted ITC statement generated for every registered person from information furnished by suppliers and other sources, and it tells taxpayers to reconcile that data with their own records and books of account. Since the Invoice Management System (IMS) went live, the recipient's own actions on the portal also shape what GSTR-2B shows. This guide sets out how the two records interact, a four-bucket reconciliation method, a worked monthly example and a checklist you can use every month.
What GSTR-2B contains and when it is generated
According to the GSTR-2B Advisory, the statement for a month is made available on the 14th day of the succeeding month. July data, for example, is released on 14 August. The information comes from:
- GSTR-1 filed monthly by suppliers, and GSTR-1 or the Invoice Furnishing Facility (IFF) used by quarterly filers;
- GSTR-5 filed by non-resident taxable persons;
- GSTR-6 filed by Input Service Distributors;
- ICEGATE data on import of goods, including inward supplies of goods from SEZ units and developers.
The cut-off for a month's GSTR-2B runs from the due date of furnishing the supplier forms for the previous month to the due date for the current month. A document filed by a supplier appears in the next open GSTR-2B of the recipient, irrespective of its date of issue. That rule is the main source of timing differences with the purchase register.
The statement has two main parts. Table 3 shows ITC available: Part A covers supplies from registered persons, ISD credit, inward supplies liable to reverse charge and import of goods, and Part B covers credit notes and their amendments. Table 4 shows ITC not available, which the advisory limits to two system-identified scenarios: credit barred by Section 16(4) of the CGST Act, and cases where the supplier and place of supply are in the same State while the recipient is registered in another State.
That second point matters. The portal flags only these specified scenarios. A credit can still be ineligible for a reason the system does not test, such as a blocked credit, personal use or goods not received. "Appears in GSTR-2B as available" is therefore never the sole approval test.
How IMS changes the monthly cycle
The GST Portal's advisory on the Invoice Management System made IMS available from 1 October onwards. It lets the recipient act on each inward record before GSTR-2B is finalised:
| Action in IMS | Effect on GSTR-2B and GSTR-3B |
|---|---|
| Accept | Record moves to the "ITC Available" section of the respective GSTR-2B |
| Reject | Record moves to the "ITC Rejected" section of the respective GSTR-2B |
| Pending | Record does not become part of GSTR-2B or GSTR-3B for the month |
| No action | Record is deemed accepted and moves to GSTR-2B |
The same advisory states that a draft GSTR-2B is made available on the 14th of the subsequent month. If the recipient acts on any record after the 14th, GSTR-2B must be recomputed before GSTR-3B is filed. No action can be taken after GSTR-3B for that month is filed.
Some records cannot be kept pending: original credit notes, upward amendments of credit notes, downward amendments of credit notes where the original was rejected, and downward amendments of invoices or debit notes where the original was accepted and GSTR-3B has been filed. Inward reverse-charge supplies reported by the supplier in Table 4B, and supplies already ineligible under Section 16(4), do not go through IMS at all. Pending invoices can be taken up later, but not beyond the Section 16(4) limit.
For the reconciliation team, this means the purchase-register match now has to happen before the GSTR-3B due date, not after it. Deemed acceptance means an unreviewed wrong invoice flows into GSTR-2B automatically.
Legal conditions GSTR-2B does not test
Section 16 of the CGST Act, 2017, as published on the CBIC tax information portal, lays down the conditions for taking ITC. Under Section 16(2), the recipient must:
- possess a tax invoice or debit note issued by a registered supplier, or another prescribed tax-paying document (clause a);
- have the invoice or debit note details furnished by the supplier in its statement of outward supplies and communicated to the recipient (clause aa);
- have received the goods or services or both (clause b);
- not have the ITC details communicated under Section 38 restricted (clause ba);
- be supported by tax actually paid to the Government by the supplier, in cash or through admissible ITC (clause c);
- have furnished the return under Section 39 (clause d).
Clause (aa) is what GSTR-2B evidences. Clauses (a), (b) and (d) sit in the recipient's own records. That is why the purchase register, goods receipt notes and service acceptance records remain essential.
Two further rules create reconciliation work. The second proviso to Section 16(2) requires a recipient who does not pay the supplier the value plus tax within 180 days from the date of the invoice to pay an amount equal to the ITC availed, along with interest under Section 50. Section 16(4) bars ITC on an invoice or debit note after the thirtieth day of November following the end of the financial year to which it pertains, or the date of furnishing the relevant annual return, whichever is earlier.
The four-bucket reconciliation
Match at document level on GSTIN, invoice number, invoice date, taxable value and each tax component. Every document then falls into one of four buckets.
1. In books and in GSTR-2B
Confirm that all matching fields agree, then apply the Section 16 eligibility tests and the blocked-credit review. Only then accept in IMS and claim.
2. In books but not in GSTR-2B
Check whether the supplier has not filed, has reported the invoice under a wrong GSTIN, or has filed after the cut-off so that the invoice will appear in the next open GSTR-2B. Do not change the books to force a match. Track the item and follow up with the vendor.
3. In GSTR-2B (or IMS) but not in books
Look for unrecorded invoices, invoices still under internal approval, goods or services not yet received, duplicate documents, and documents that belong to another entity or branch. With IMS, these are the records to reject or keep pending before the draft GSTR-2B becomes final.
4. Amount or master-data mismatch
Investigate differences in taxable value, tax rate, tax amount, place of supply (which changes IGST versus CGST and SGST), and credit note or debit note treatment. Claim only what the books and the eligibility review support.
Worked example: April close for a trading company
Assume the April purchase register shows eligible-looking input GST of Rs 8,40,000. The draft GSTR-2B generated on 14 May shows Rs 8,65,000. The Rs 25,000 difference must be explained, not simply absorbed.
| Item | GST (Rs) | Finding | IMS action |
|---|---|---|---|
| Service invoice visible on portal, still under internal approval | 18,000 | Service not yet accepted by the user department | Keep pending |
| Invoice issued to our GSTIN by mistake; belongs to an unrelated buyer | 7,000 | Not our supply | Reject |
| Balance matched invoice by invoice | 8,40,000 | Agrees with books | Accept after eligibility review |
After these actions, the recomputed GSTR-2B shows Rs 8,65,000 minus Rs 7,000 minus Rs 18,000, which is Rs 8,40,000, and it agrees with the books. The Rs 18,000 invoice can be accepted in a later month once the service is confirmed, within the Section 16(4) limit. The file records why each item was treated as it was, so the credit taken in GSTR-3B is fully explained.
Now take a second test on the same data. One matched purchase has a taxable value of Rs 5,00,000 with 18% IGST of Rs 90,000. If the supplier is not paid within 180 days from the invoice date, the second proviso to Section 16(2) requires the recipient to pay back Rs 90,000 with interest under Section 50. A vendor ageing report linked to the ITC register catches this; GSTR-2B will not.
For the time limit, an invoice of FY 2025-26 that has not been claimed must be claimed by 30 November 2026, or earlier if the annual return for FY 2025-26 is furnished before that date.
Timing differences and duplicate claims
Because a document appears in the next open GSTR-2B regardless of its date, an invoice dated in March may be reported by the supplier in May. Keep the original invoice date in the books and record the GSTR-2B period in which the document appeared, instead of rewriting accounting dates to make the months agree.
The GSTR-2B Advisory also states that no credit shall be availed twice. The risk is highest when an invoice missing from an earlier statement was handled manually and later appears. Maintain a claim-status field for every document: claimed, pending, rejected, reversed or re-availed, with the tax period for each event.
Reverse charge and imports
The GSTR-2B Advisory states that reverse-charge credit on import of services is not part of the statement; it continues to be entered in Table 4(A)(2) of GSTR-3B. Domestic reverse-charge supplies reported by suppliers do appear in GSTR-2B, but the tax must still be paid and the credit reported through the relevant GSTR-3B tables. Under the IMS advisory, such Table 4B records bypass IMS.
Import of goods data comes from ICEGATE. Reconcile bills of entry and customs records separately rather than expecting the domestic purchase register match to explain every import difference. Unresolved monthly differences also carry into the annual return; our GSTR-9 and GSTR-9C reconciliation checklist covers that year-end step.
Monthly checklist
- Freeze the books extract for the tax period with GSTIN, invoice number, date, taxable value and tax components.
- Download document-level IMS and draft GSTR-2B data after the 14th and keep the file used for the close.
- Standardise matching fields such as invoice-number formats and GSTINs, without altering the source data.
- Sort every document into the four buckets: full match, book-only, portal-only and mismatch.
- Apply the Section 16 tests and blocked-credit review independently of portal visibility.
- Take IMS actions: accept, reject or keep pending, remembering that no action means deemed acceptance.
- Recompute GSTR-2B if any action was taken after the 14th.
- Update the claim-status register for claimed, pending, rejected, reversed and re-availed amounts.
- Check vendor ageing for invoices approaching 180 days unpaid.
- Review the Section 16(4) deadline for pending invoices of the previous financial year before 30 November.
- Send vendor follow-ups for missing and wrongly reported documents.
- Reconcile to GSTR-3B so that the eligible credit working explains the figure in the return.
Common mistakes
- Claiming every record shown as available in GSTR-2B without testing Section 16 conditions and blocked credits.
- Leaving IMS untouched, so that wrong invoices are deemed accepted.
- Treating every book-only invoice as permanently ineligible instead of checking timing and supplier reporting.
- Ignoring portal-only invoices because they are not in the ledger.
- Matching only total IGST, CGST and SGST instead of document-level data.
- Not keeping a prior-period claim history, which leads to double claims.
- Expecting GSTR-2B to carry reverse-charge credit on import of services.
Every material invoice should answer three questions: is it in the books, does the portal data agree, and is the credit legally eligible? A monthly close built around those questions, with IMS actions taken before GSTR-3B and a document-level claim history, gives a much stronger ITC control than matching two monthly totals.
Updated on 27 September 2026: added the Invoice Management System workflow (accept, reject, pending, deemed acceptance, recomputation), the GSTR-2B generation date and cut-off, Section 16 conditions including the 180-day and 30 November rules, an expanded worked example and a merged monthly checklist.
