GST ASMT-10 Scrutiny Notice Reply: Format, Deadlines, Defects

A GST scrutiny notice rarely arrives at a good time. It usually lands in your inbox as a PDF named something like "ASMT-10.pdf", signed by a State or Central tax officer you have never spoken to, listing four or five line items where the department believes your GSTR-1 and GSTR-3B did not agree. There is no hearing date on it. There is no allegation of fraud. It simply says the officer has noticed a discrepancy and asks you to explain, and the clock has already started.

Most taxpayers lose these cases not because the tax was actually due, but because the reply was written badly. A one-line "tax already paid, kindly ignore" uploaded to the portal, with no working, no invoices and no reconciliation, is treated as no reply at all. The officer then raises a demand under Section 73 of the CGST Act, adds interest and penalty, and the matter moves from a scrutiny to a recovery proceeding. This guide sets out the GST ASMT-10 reply format that officers actually accept, the documents that must sit behind it, and the mistakes that turn a routine scrutiny into a demand order.

What an ASMT-10 notice actually is

Section 61 of the CGST Act allows the proper officer to scrutinise a return you have filed and, if he finds a discrepancy, to serve a notice informing you of it and asking for an explanation. The mechanism is implemented through Rule 99 of the CGST Rules, and the notice itself is issued in FORM GST ASMT-10. It is important to be clear about what this is not. It is not an audit under Section 65. It is not a search, inspection or summons. It is not an allegation of evasion. It is a desk review of the returns you filed, comparing what you declared in GSTR-1 with what you paid in GSTR-3B, what your suppliers reported against your input tax credit claim, and what your e-way bills say against your turnover.

The notice will list the discrepancies in a table, each with a short description and the tax period concerned. Typical entries read "excess ITC claimed as per GSTR-2A/2B", "turnover mismatch between GSTR-1 and GSTR-3B", "taxable value mismatch between GSTR-1 and e-way bill data", or "ITC availed from cancelled dealers". You then have thirty days from the date of service to furnish a reply. If the officer is satisfied, he concludes the proceedings and informs you. If he is not satisfied, he issues a show-cause notice in FORM GST ASMT-11 and the matter proceeds to a demand order.

Why the reply matters more than the notice

The asymmetry is stark. The notice is generated semi-automatically by the GSTN analytics engine, often without a human reading your file closely. Your reply is the only document in which a human being hears your side. If your reply is thorough, the officer usually drops the item or reduces it to a token amount. If your reply is thin, the officer has no option but to proceed, because his own file must show that he asked and you failed to explain.

There is a second, quieter reason. Once an ASMT-11 show-cause notice is issued, the burden shifts. Under Section 155 of the CGST Act the burden of proving that you are eligible for input tax credit or that you are not liable to pay tax lies on you. An ASMT-10 reply is the earliest and cheapest place to discharge that burden. If you build the evidence file now, you carry it forward into the demand proceedings instead of starting from zero.

GST ASMT-10 reply format: the structure officers expect

The portal gives you a text box with a character limit. Do not try to fit the argument into the box. Write a formal reply letter as an annexure, upload it as a PDF, and use the text box to summarise and point to the annexure. The letter should follow a predictable order so that the officer can tick each item off against his notice.

Part A — Reference block and admission of the notice

Open with your GSTIN, legal name, trade name, the notice reference number and date, the tax period or periods covered, and the date on which the notice was served. Then one sentence stating that you are filing the reply within the period allowed under Rule 99. Officers reject replies that cannot be tied to a specific notice, and an unclear reference block is the most common reason a reply is treated as unsolicited correspondence.

Part B — Item-wise reconciliation

Reproduce each discrepancy exactly as the officer framed it, in the same order and with the same numbering. Against each one, state your position in three sentences: what you declared, what the portal shows, and why the difference exists. Then attach the working. A reconciliation table with columns for the officer's figure, your books figure, the difference, and the reason is far more persuasive than prose.

Part C — Evidence index

List every annexure with a number and a one-line description: invoice copies, ledgers, bank statements, e-way bill summaries, supplier confirmations, credit notes, refund applications. The index must match the page numbers in the PDF. An officer who has to hunt for the invoice you referred to on page nine will usually not hunt.

Part D — Prayer and undertaking

Close by asking specifically for what you want: that the discrepancy be treated as explained and proceedings concluded, or that the demand be restricted to the admitted amount. If any tax is genuinely payable, admit it and state the date of payment with the challan reference. A partial, honest admission is far stronger than a blanket denial that the officer can disprove from the portal in two clicks.

Reading the discrepancy codes correctly

Each line in the notice corresponds to a specific analytics comparison, and each has a different defence. Getting the category wrong is how taxpayers end up arguing about the wrong thing for three adjournments.

If the notice cites a comparison you do not recognise, do not guess. Download the corresponding statement from the portal — the GSTR-2B summary, the e-way bill report, the GSTR-1A amendment log — and work backwards from the officer's figure until you find the invoice he is looking at. The number in the notice is always traceable to a document.

Deadlines, extensions and what happens if you miss them

The statutory window is thirty days from service. Service is usually by electronic means on the portal, and the date shown on the portal is treated as the service date, so the clock may start before you open your email. If you cannot compile the reply in time, do not stay silent. Upload an interim reply within the window acknowledging the notice, explaining that records are being retrieved, and requesting a specific extension period. Many officers grant one extension on the portal; almost none grant an extension to a taxpayer who has filed nothing.

Missing the deadline does not automatically create a demand, but it removes your best opportunity to be heard before the demand order. After the order is passed, your remedies are a rectification application under Section 161 for errors apparent on the face of the record, or an appeal to the appellate authority with the pre-deposit that entails. Both are slower and more expensive than a good reply. If the demand relates to a period where fraud or suppression is alleged, Section 74 applies instead of Section 73 and the penalty exposure is materially higher — which is another reason to engage at the ASMT-10 stage rather than later.

The mistakes that get replies rejected

• Replying in the text box only. The character limit forces you into vague generalities; upload a signed letter as well.
• Denying everything. If one line item is genuinely wrong, admit it and pay it. Contesting an indefensible item damages your credibility on the rest.
• Arguing law instead of fact. The officer at this stage is checking arithmetic. Save the interpretation arguments for the show-cause reply, and answer the numbers first.
• Attaching a 300-page PDF with no index. Unindexed annexures are read as an absence of evidence.
• Not reconciling to the officer's exact figure. "Roughly matches" is not a reply; show the bridge from his number to yours.
• Ignoring the tax period. A credit note dated in the next financial year does not explain a mismatch in the current one, and mixing periods is how small differences become demands.
• Uploading after the deadline without an extension request. The portal may accept the file; the officer is entitled to ignore it.

Documents to gather before you write a word

Assemble the file first, then draft. You need the return summaries for each period in the notice, the sales and purchase ledgers from your accounting software, the GSTR-2B statement for the relevant months, the e-way bill report, bank statements showing payment to suppliers, and the invoices the officer has flagged. For credit claimed on imports, add the bill of entry. For services under reverse charge, add the self-invoice and the payment proof.

If a supplier's credit is disputed because the supplier did not file, get a written confirmation from the supplier that the invoice was issued and the tax was collected, along with the invoice and your payment proof. Under the input tax credit rules, the credit is your statutory entitlement where the conditions are met, and the supplier's subsequent default is a matter between the supplier and the department — but you must be able to show the purchase was real. That supplier confirmation is often the single document that closes the item.

Frequently asked questions

Is ASMT-10 the same as a tax audit?

No. A scrutiny under Section 61 is a desk review of filed returns. An audit under Section 65 involves a formal audit of books and records, usually after prior intimation, and has its own timelines and conclusions. ASMT-10 is narrower and cheaper to resolve, which is why responding properly at this stage is worth the effort.

Can I reply to ASMT-10 myself without a consultant?

You can, and for a single-line mismatch backed by clear invoices it is often enough. Where the notice covers multiple periods, alleges suppression, or disputes a large ITC claim, the reply becomes the foundation of a later appeal and is better drafted with professional help. The cost of a reply is small against the cost of a demand order and its pre-deposit.

What happens if the officer accepts my explanation?

The proceedings are concluded and you are informed, typically on the portal. Keep the closure communication with your GST records — it is your proof that the same period was already scrutinised if the issue resurfaces during a later audit or a different proceeding.

Do I have to pay tax before replying?

Not automatically. If you accept a part of the discrepancy, paying that part with interest before or along with the reply materially improves your position and limits penalty exposure. For disputed items, reply first and let the officer decide; voluntary payment of a disputed amount can complicate a later refund claim.

What if the notice is addressed to a period where I was under composition?

Composition dealers file quarterly statements rather than GSTR-1 and GSTR-3B, and the analytics comparison sometimes misfires. Say so plainly in the reply, attach the composition option exercised for that year and the quarterly challans, and ask for the notice to be withdrawn. Do not ignore it on the assumption that it was issued by mistake.

Drafting Support

Our drafting team prepares item-wise ASMT-10 replies with the reconciliation working, evidence index and covering letter, formatted for upload on the GST portal. Send us the notice and your return summaries and we will map each discrepancy to its explanation.