A GST demand notice based on mismatch between GSTR-1 and GSTR-3B should be answered with reconciliation first and argument second. GSTR-1 records outward supplies. GSTR-3B records the tax liability discharged for the period. A difference can be serious under section 75(12) of the CGST Act and Rule 88C of the CGST Rules, but it still has to be understood before it is accepted, paid, or contested.
The first question is simple: what exactly is the mismatch? It may be a case where outward supplies were reported in GSTR-1 but tax was not discharged in GSTR-3B. It may also be a timing issue, amendment entry, credit note adjustment, advance adjustment, export reporting difference, rate classification issue, or branch transfer. A demand notice should not be met with panic or a spreadsheet avalanche. The department needs an answer; it does not need a warehouse of unsorted data.
What the notice should be tested against
Start with the notice, the period, the provision invoked, and the form used. If the communication is an intimation under Rule 88C in Form GST DRC-01B, the response should deal with the liability difference and any payment through DRC-03, where applicable. If the matter has moved to a show cause notice under section 73 or 74, the reply must address the proposed tax, interest, penalty, facts, and legal basis. If recovery is threatened under section 75(12), check whether the facts truly concern self-assessed tax reported in GSTR-1 but not included in GSTR-3B.
The records usually required are GSTR-1, GSTR-3B, GSTR-9 where relevant, sales register, tax invoices, debit notes, credit notes, e-way bill data, export documents, customer ledgers, DRC-03 challans, and reconciliation workings. The reconciliation should be period-wise and issue-wise. If the difference relates to later amendments, show the original entry, amendment entry, tax period, and return in which the tax was paid.
What courts have indicated
In Hajabandenawas v. State Tax Officer, decided by the Madras High Court on 15 May 2024, the Court set aside an order involving GSTR-1 and GSTR-3B mismatch and remanded the matter after noting that the taxpayer should be permitted to submit documents and explanation. The point is not that every mismatch demand will fail. The point is that documentary explanation and hearing matter.
The Calcutta High Court in Kuddus Ali v. Assistant Commissioner of Central Tax, reported as 2025 (5) TMI 914, considered section 75(12). The Court indicated that direct recovery is not the correct route where the facts do not fit the statutory condition of self-assessed tax in GSTR-1 not being included in GSTR-3B. If the officer rejects the taxpayer's explanation, the proper adjudication route must be followed.
Service Tax-era reasoning also helps mutatis mutandis, with care. In Commissioner of CGST and Central Excise, Mumbai East v. Modern Road Makers Private Limited, Final Order No. 86160/2023, in a decision authored by me, the Bench examined a demand arising from a mismatch between Form 26AS figures and ST-3 returns. The Tribunal's reasoning was record-centred: a demand cannot rest on numerical difference alone without examining the activity, reason for difference, and taxable character of the amount. That principle does not replace GST provisions, but it is useful discipline when responding to mismatch-based allegations.
Three mistakes to avoid
The first mistake is admitting liability before preparing the reconciliation. The second is assuming every difference is harmless. Some mismatches do represent unpaid tax and require prompt payment with interest. The third is filing a reply that explains accounting entries but ignores the legal provision invoked.
AGS Consulting approaches such notices through issue identification, return reconciliation, and procedural review. Led by Mr. Anil G. Shakkarwar, former Member (Technical), CESTAT, the practice assists businesses and counsel in separating payable liability from explainable mismatch and preparing a record for the proper officer or appellate forum.
For businesses facing a GSTR-1 and GSTR-3B mismatch notice, early reconciliation is often the safest first step. To review the notice, return data, and response strategy, contact AGS Consulting for a focused GST advisory consultation.
FAQs
Does every GSTR-1 and GSTR-3B mismatch create GST liability?
No. A mismatch may indicate unpaid tax, but it may also arise from timing differences, amendments, credit notes, or exports. The records must be reconciled before the position is accepted or contested.
Can GST recovery start directly for a GSTR-1 and GSTR-3B difference?
Direct recovery under section 75(12) depends on whether the statutory condition is met. If the issue requires adjudication, the department should follow the applicable notice and determination process.
What documents should be prepared for the reply?
Prepare GSTR-1, GSTR-3B, sales register, invoices, debit and credit notes, ledgers, e-way bill data where relevant, DRC-03 challans, and a clear period-wise reconciliation.
How can AGS Consulting assist with a mismatch notice?
AGS Consulting can review the notice, identify the precise issue, test the reconciliation, examine relevant case law, and help frame a measured response that preserves the business's GST position.