A GST notice is unsettling mostly because of the unfamiliar form number, not the actual content — once you know what each one means and what it's actually asking for, most are routine and have a clear, time-bound response process rather than being the crisis they feel like at first read.
ASMT-10 — Scrutiny Notice
Issued when the department's automated systems flag a discrepancy between your returns — most commonly GSTR-1 vs GSTR-3B totals not matching, or ITC claimed exceeding what GSTR-2B shows for the period. It lists the specific discrepancy identified and gives you a window, typically 30 days, to respond via Form ASMT-11 with either an explanation for the difference or a corrective payment.
This is the most common notice by volume and, in our experience handling these for clients, the least alarming — the majority are resolved with a clear, well-documented written explanation (a reconciliation showing why the figures differ isn't actually a discrepancy) and, where a genuine gap exists, a voluntary payment through DRC-03 to close it out before it escalates further.
DRC-01 — Show Cause Notice
A more formal notice proposing a specific tax demand, usually following up on an ASMT-10 that wasn't satisfactorily resolved, or arising independently from an audit, investigation, or departmental verification. It requires a substantive written reply (Form DRC-06) addressing each ground raised in the notice individually, within the timeline specified — typically 30 days from issuance.
This is where professional representation genuinely earns its cost, since the DRC-06 reply becomes the formal basis for any further proceedings — a vague or incomplete reply at this stage is much harder to walk back later than getting it right the first time. Each allegation in the notice needs a specific, evidenced rebuttal or acceptance; a generic "we disagree" response without supporting documentation tends to result in the demand being confirmed.
REG-17 — Show Cause for Registration Cancellation
Issued when the department proposes to cancel your GST registration outright — commonly triggered by continuous non-filing (six consecutive months of non-filing for regular taxpayers, or a shorter window for composition taxpayers), or by discrepancies found during a physical verification of your registered place of business. You get only seven working days to reply via Form REG-18 — a noticeably shorter window than ASMT-10 or DRC-01, reflecting how seriously the department treats this category.
Missing this deadline results in cancellation of registration, which then requires a separate, materially harder revocation process to reverse — involving filing all pending returns, paying all outstanding dues plus interest and late fees, and a fresh application that isn't guaranteed to succeed. If you receive a REG-17, treat the seven-day window as non-negotiable.
Other Notices Worth Knowing By Name
- RFD-08 — a show-cause notice specifically for a refund claim the officer believes is inadmissible in whole or part, requiring a reply via RFD-09
- ADT-01 — notice of a GST audit being conducted on your business, requiring you to produce specified records and information by a stated date
- DRC-07 — not itself a notice requiring reply, but the summary order confirming a demand after a DRC-01/DRC-06 exchange has concluded; if this arrives, the assessment stage is over and appeal (rather than further reply) is the available route
The One Rule That Matters More Than Anything Else
Every GST notice has a hard reply deadline, and non-response is treated as an admission of the department's position far more often than people expect — silence isn't a neutral act in GST proceedings, it's effectively a concession. Whatever the notice, whatever else you're deciding about how to respond, the first and most important step is always the same: read the exact deadline on the notice, and don't let it lapse while you're still deciding on strategy.
Frequently Asked Questions
Can I get an extension on a notice reply deadline? Extensions are sometimes granted on written request showing genuine cause, but they're at the officer's discretion and not guaranteed — request one well before the deadline lapses, never after, and don't assume it will be granted.
Do I need a lawyer or CA to reply to a GST notice, or can I do it myself? For a straightforward ASMT-10 with a clear, documentable explanation, a well-prepared self-filed reply is often sufficient. For DRC-01 show cause notices or anything involving a proposed demand of meaningful size, professional representation materially improves outcomes — the reply format and the way grounds are addressed genuinely affects how the case proceeds.
What if I genuinely made an error and the notice is correct? Acknowledging a genuine error and paying the shortfall voluntarily, ideally before or promptly after the notice, generally results in a better outcome than contesting a valid claim — interest still applies, but penalty exposure is typically lower for voluntary, cooperative resolution than for a demand confirmed after a contested proceeding.