Detailed Explanation
How it works
Generated on the 14th of each month, GSTR-2B does not change once created and is the basis for claiming ITC under Section 16(2)(aa). It classifies each invoice as available or not available with reasons.
Why 2B (not 2A) is the operative document
GSTR-2B is the static monthly ITC statement generated on the 14th from suppliers' GSTR-1/IFF filings for that cycle — it does not change later, unlike the dynamic 2A. Since 1 January 2022, Section 16(2)(aa) makes 2B appearance a hard condition for ITC: if the invoice is not in your 2B, the credit is not available that month, whatever your paper invoice says.
Worked example
Your purchase register for May shows Rs.4,20,000 of ITC across 61 invoices. The May 2B (generated 14 June) contains 55 of them worth Rs.3,80,000. Your 3B ITC claim for May is Rs.3,80,000 — the remaining Rs.40,000 waits until the six suppliers file (it will appear in a later 2B). Claiming the full Rs.4,20,000 creates a 2B-vs-3B excess that the portal flags (DRC-01C territory) and that carries Section 50(3) interest if utilised.
Operating rhythm
Download 2B on the 14th, reconcile to the purchase register by the 17th (GSTIN + invoice number + date matching, with normalisation for formatting), act on exceptions through IMS (accept/reject/pending), chase chronic non-filing vendors contractually, and tie the cumulative 2B-availed figure to GSTR-9 Table 8 at year-end. The 2B reconciliation workbook is the single most-requested document in GST desk audits.
Frequently asked questions
Is ITC based on GSTR-2A or GSTR-2B?
On GSTR-2B, which is static and is the statement referenced for the Section 16(2)(aa) condition.
When is GSTR-2B generated?
On the 14th of each month, after suppliers file their GSTR-1/IFF.
This content is for general guidance only and does not constitute professional advice. Tax law changes frequently — verify the current position and consult a qualified Chartered Accountant before acting. Last reviewed: June 2026.