GSTR-3B vs GSTR-2B: Fixing an ITC Mismatch Before It Becomes a Demand
A practical reconciliation playbook for the most common GST notice — the ITC mismatch between GSTR-3B and GSTR-2A/2B — and the exact provisions to cite.
The single most common GST notice is the input-tax-credit (ITC) mismatch: the credit you claimed in GSTR-3B is more than what appears in GSTR-2A/2B. Left unexplained, it becomes an ASMT-10 scrutiny query or a DRC-01 demand.
Why the mismatch happens
Most mismatches are timing or reporting differences, not wrong credit: a supplier filed late, an invoice was carried forward and availed in a later period, or an amendment shifted a figure across returns.
The reconciliation playbook
Build an invoice-wise reconciliation: list each disputed invoice, its date, supplier, and the CGST/SGST claimed, and show the period in which it appears in 2A/2B. This turns a vague aggregate difference into a set of explainable line items.
What to cite
For prior-year credit availed within the limit, Section 16(4) governs timing. For FY 2017-18 and 2018-19 2A/3B differences, Circular 183/2022 prescribes a reconciliation procedure. And courts have held that a bona-fide recipient's ITC cannot be denied solely for a supplier's default.
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