Nobody opens your GST return anymore before it gets flagged. GSTN's Automated Return Scrutiny Module reads your GSTR-1, GSTR-3B and GSTR-2B against each other every filing cycle, and the moment two numbers refuse to match, Form ASMT-10 lands in your "Additional Notices" tab. No officer, no phone call, no warning.
This piece walks through what triggers that notice, what the department's system is actually checking, and how to close it out with a clean ASMT-11 reply instead of letting it snowball into a Section 73 demand.
1. GST Compliance Has Quietly Gone Algorithmic
The scrutiny module went live in May 2023, sitting inside the ACES-GST backend that officers use. It pulls data from GSTR filings, e-way bill records, and analytics platforms like DGARM and ADVAIT, then runs it against a fixed set of risk parameters. When a return crosses one of those thresholds, the system generates the notice on its own the officer's name appears on it, but a human didn't go looking for the mismatch.
That's a real shift from how scrutiny worked even three years ago, when an officer had to manually pull a file and compare figures line by line. Today the comparison happens the moment you hit submit.
2. What Is Form ASMT-10?
Form ASMT-10 is a scrutiny notice issued under Section 61 of the CGST Act, read with Rule 99, when the system (or an officer) finds a discrepancy between your filed returns. It isn't a demand and it isn't a penalty, it's a question the department wants answered.
Is ASMT-10 the same as a show cause notice?
No. ASMT-10 is an enquiry stage, not an adjudication. If your reply in Form ASMT-11 satisfies the officer, the matter closes with an ASMT-12 acceptance and nothing else happens. Only an unsatisfactory or missing reply pushes the case toward a Section 73 or 74 show cause notice in Form DRC-01, where the stakes get considerably higher.
How much time do you get to reply?
Thirty days from the date of issue, with a possible 15-day extension if you request one before the deadline. Miss it entirely and the officer can proceed straight to determining tax, interest and penalty without waiting for your side of the story.
3. What the System Actually Checks Before It Flags You
Three comparisons account for most ASMT-10 notices right now.
GSTR-2B vs GSTR-3B the ITC mismatch
If the input tax credit you claimed in GSTR-3B runs higher than what's auto-populated in GSTR-2B for that period, the system catches it instantly. This is the single most common trigger, and it's often not even your mistake that a supplier filing GSTR-1 late, or not at all, leaves a hole in your 2B that the algorithm doesn't care to explain on your behalf.
GSTR-1 vs GSTR-3B the liability mismatch
Outward supply declared in GSTR-1 that doesn't line up with the tax actually paid in GSTR-3B raises an immediate flag. Sometimes this is a genuine short-payment; sometimes it's a credit note or a timing difference between when a sale was reported and when the corresponding tax was deposited.
E-Way Bill vs GSTR-1 the turnover mismatch
The system also checks whether the value of e-way bills generated against your GSTIN roughly matches the turnover you reported. A large gap suggests supplies moved without corresponding sales being disclosed, which is precisely the kind of pattern the module is built to surface.
4. Manual Scrutiny vs the Automated Module
The mechanics changed more than most taxpayers realise. Here's the practical difference.
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Aspect
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Manual Scrutiny (Pre-2023)
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Automated Return Scrutiny Module
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Who initiates it
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Officer manually selects a return for review
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System auto-selects returns that breach risk parameters
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Speed
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Weeks to months after filing
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Can flag within the same or next filing cycle
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Data sources
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Return data reviewed in isolation
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Cross-checks GSTR-1, 3B, 2B, e-way bill data, DGARM/ADVAIT analytics
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Notice delivery
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Often physical or emailed separately
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Auto-generated on the portal, plus SMS/email alert
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Consistency
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Varies by officer's judgement
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Same parameters applied uniformly nationwide
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5. A Jaipur Case: What an ASMT-10 Actually Looks Like in Practice
A garment trading firm in Jaipur's Johari Bazaar area filed its GSTR-3B for December 2025 claiming input tax credit of ₹3,42,000. Its GSTR-2B for the same period reflected only ₹2,78,500, a gap of ₹63,500, largely because two suppliers had filed their GSTR-1 late.
The automated module flagged the mismatch within the same filing cycle. An ASMT-10 appeared under "Additional Notices and Orders" nine days later, giving the firm 30 days to respond.
The firm's accountant pulled purchase invoices, matched them against the delayed supplier filings, and split the response in two parts: for ₹48,000 of the credit, the supplier had since filed and the 2B had updated, so that portion was explained with a reconciliation statement. For the remaining ₹15,500, the credit genuinely wasn't supportable that period, so the firm reversed it and paid the amount with interest through Form DRC-03, attaching the payment challan to the ASMT-11 reply.
The officer accepted the explanation and issued Form ASMT-12 within three weeks, closing the matter without escalation to a show cause notice.
“Most ASMT-10 notices are timing gaps, not tax evasion.”
a Jaipur-based GST practitioner handling scrutiny replies for MSME clients
6. How to Reply to ASMT-10, Step by Step
1. Read the discrepancy parameter carefully. The notice names the specific mismatch, the tax period, and the exact figures involved don't assume; check what's actually being asked.
2. Reconcile before you respond. Pull GSTR-1, GSTR-3B, GSTR-2B, and your purchase/sales registers for the flagged period and line them up against each other.
3. Decide, item by item, whether you agree. Some discrepancies are genuine errors; others are timing differences or a supplier's delay that isn't really your liability.
4. Pay what's actually due through Form DRC-03, and keep the challan it's your strongest attachment.
5. File Form ASMT-11 within 30 days (or the extended window), attaching your reconciliation statement and any payment proof.
6. Track the outcome. A satisfied officer issues Form ASMT-12 and the matter ends there. No response, or a weak one, risks escalation to a Section 73/74 demand under Form DRC-01.
7. Reducing Your Chances of Getting Flagged
There's really one habit that prevents most of this: reconcile before you file, not after a notice forces you to.
• Match GSTR-2B against your purchase register every month before claiming ITC in GSTR-3B don't claim credit the portal hasn't caught up with yet.
• Chase suppliers who file late. Their delay becomes your mismatch on the system's dashboard.
• Cross-check e-way bill values against declared turnover for high-volume months, especially if goods move through multiple states.
• Keep every reconciliation working paper. If a notice does arrive, having the paperwork ready cuts your response time from days to hours.
8. Conclusion
Automated scrutiny isn't going away, and honestly, it shouldn't catch genuine revenue leakage faster than any officer manually reviewing files ever could. The trade-off is that it also catches timing differences and supplier delays with the same speed, and it doesn't distinguish between the two until you tell it to.
The businesses that handle ASMT-10 well are the ones that reconcile every month, not just after a notice shows up. Everyone else is doing the same work, just under a 30-day deadline instead of on their own schedule.
Need Help With an ASMT-10 Reply?
If a system-generated ASMT-10 has landed on your portal and you want a clean, evidence-backed ASMT-11 filed before the deadline, FreeGST's notice help team can run the reconciliation and draft the reply with you. Visit FreeGST Notice Help Services to get started.
Author Note
Kanan Gautam is a GST and business compliance content specialist associated with FreeGST.co. She regularly researches GST registration, GST amendments, GST returns, e-invoicing, MSME compliance, and regulatory updates issued by GSTN, CBIC, GST Council, and the Ministry of Finance. Her content focuses on simplifying complex tax and compliance topics for business owners, startups, professionals, and MSMEs across India.
Frequently Asked Questions
What is ASMT-10 in GST?
ASMT-10 is a scrutiny notice under Section 61 of the CGST Act, issued when the department's system or an officer finds a discrepancy in your filed returns. It asks for an explanation it is not a tax demand by itself.
How do I reply to an ASMT-10 notice online?
Log in to the GST portal, go to Services > User Services > View Additional Notices and Orders, open the ASMT-10 entry, and submit your explanation through Form ASMT-11, attaching reconciliation statements and any DRC-03 payment proof.
What happens if I don't reply to ASMT-10 within 30 days?
The proper officer can proceed to determine tax, interest and penalty under Section 73 or 74 without further reference to your explanation. Silence is treated as an unresolved discrepancy, not as agreement or disagreement.
Can AI-generated ASMT-10 notices be wrong?
Yes. The system matches figures mechanically and doesn't know the context a genuine timing difference or a supplier's late filing looks identical to a real error until you explain it. That's exactly what the ASMT-11 reply is for.
Does paying through DRC-03 close the ASMT-10 automatically?
No. Paying the tax and interest via DRC-03 is a strong step, but you still need to reference that payment inside a formal ASMT-11 reply for the officer to close the matter with Form ASMT-12.