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The Basics
If you've just logged into the GST portal and found a notice waiting for you, your stomach probably dropped a little. That's normal. Most business owners aren't tax professionals, and a government notice written in legal language can feel like a threat even when it isn't one. The good news: a GST notice is not a punishment by itself. It's a question. The department wants clarity on something: a missed return, a mismatched number, or a refund that looked too large. How you answer decides what happens next.
A GST notice is a formal communication from the tax department to a registered taxpayer, sent through the GST portal under your account login. It gets issued when the system or an officer spots something that doesn't add up: a return you didn't file, a number that doesn't match across forms, or a claim that needs a closer look.
Every notice comes with a deadline, usually somewhere between 15 and 30 days from the date it's issued. That window matters more than almost anything else in this process. Miss it, and the officer is free to decide your case without hearing your side.
Common Triggers
There's no single reason notices go out, but a few situations come up again and again.
GSTR-1 or GSTR-3B not filed on time is probably the most common trigger. The system flags non-filers automatically, and the notices follow a predictable escalation.
If the input tax credit you claimed in GSTR-3B doesn't line up with what shows in GSTR-2B, expect a notice asking you to either reverse the credit or justify it with supplier documentation.
When the revenue in your GST filings doesn't match what you reported to the income tax department, the mismatch gets flagged for scrutiny.
Exporters and businesses under inverted duty structures sometimes claim refunds that are technically correct but unusually large relative to their filing history. That triggers verification.
Expired bills, missing documentation during transport, or route deviations can lead to notices and, in some cases, a roadside inspection.
Fake invoices or ITC claimed without actually receiving goods or services fall under Section 74, and these notices are far more serious than the rest.
Notice Types
Not every notice carries the same weight. Here's a rough map of the ones that show up most often.
ASMT-10 notices come under Section 61 and deal with discrepancies the department spotted while scrutinizing your returns. They're usually a request for explanation rather than an accusation. ASMT-14, under Section 63, is more serious — it's a best-judgment assessment aimed at people who haven't filed returns at all.
ADT-01, issued under Section 65, means the department wants to audit your books directly. DRC-01 and its softer cousin, DRC-01A, are the ones that tend to cause the most worry, because they involve an actual demand for tax, interest, and penalty under Section 73 or 74.
REG-03 is a routine clarification request during a new registration application. REG-17 is anything but routine — it's a show-cause notice proposing to cancel your GST registration entirely, usually because of prolonged non-filing.
First Steps
Note the notice type, the section it's issued under, and the exact deadline. These three details shape everything that follows.
A rushed, defensive response that misses the actual point being raised can do more damage than staying quiet for a day while you figure out the real issue.
Reconciliation work — matching GSTR-1 against GSTR-3B, or GSTR-3B against GSTR-2B — takes time, and that 15-to-30-day window shrinks fast once you account for gathering documents.
Filing the Reply
The reply itself gets filed through the portal, under Services, then User Services, then My Applications. You'll need your registered login credentials, and the response has to be digitally verified: companies and LLPs use a digital signature certificate, while proprietorships and individuals can verify through an OTP-based EVC.
Supporting documents go up as PDF attachments, capped at 5 MB each, so scan carefully and compress where needed. Once submitted, you'll get an application reference number you can use to track the status of your reply and see whatever the officer decides next.
Paperwork
What you need depends entirely on the notice type.
These should demonstrate that your business is still active.
Common Mistakes
A few patterns show up over and over in notices that escalate unnecessarily.
People get a notice, don't fully understand it, and instead of asking someone, they just sit on it hoping it resolves itself. It doesn't. The deadline keeps moving toward zero whether you understand the notice or not.
A one-line response that says "please find attached" without addressing the specific discrepancy the officer raised rarely closes anything. It just invites a follow-up notice, and now you've burned part of your window for nothing.
A reply built for a routine Section 73 scrutiny doesn't hold up against a Section 74 fraud allegation. The standard of proof, and what you need to show, are genuinely different.
A reply sitting unattended on the portal, with no one checking for the officer's response, can quietly run past a second deadline you didn't know existed.
DIY vs. Professional
Filing a reply on the GST portal costs nothing. There's no government fee for submitting your response. If your notice is straightforward, say a basic ASMT-10 scrutiny with a clear explanation, plenty of taxpayers handle it themselves without trouble.
Where it gets harder is anything involving Section 74, a sizable DRC-01 demand, or a REG-17 cancellation threat. These carry real financial stakes and require a reply that holds up legally, not just one that sounds reasonable. That's usually where bringing in a chartered accountant earns its cost — not because the portal is complicated to use, but because the legal framing of the argument is where cases actually get won or lost.
Risk
This is where things go wrong fastest. Miss the deadline, and the officer issues what's called an ex-parte order — a tax demand calculated entirely from the department's side, with no input from you, and it's almost never in your favor.
A confirmed demand can lead to your bank account being attached under Section 79 recovery proceedings, with funds pulled directly by the government.
Repeated non-response to notices, especially REG-17 cancellation notices, can end with your GSTIN suspended or cancelled outright, which means you can't issue invoices or claim credit until you go through a revocation process.
Worth Knowing
If you read a notice and realize the department actually has a point, you don't have to fight it. DRC-03 is a voluntary payment form that lets you pay the admitted tax before or during proceedings.
Doing this, particularly under Section 73, can meaningfully cut down the penalty you'd otherwise face. Sometimes the smartest reply is simply paying what's owed and closing the matter before it escalates into something bigger.
Answers to the most common questions about receiving and replying to GST notices.
Ready When You Are
Whatever the notice type, the deadline is real and the stakes only grow with delay. Our CA team reviews the notice, builds the right reply, and tracks the ARN through to resolution.