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Response Required Within 30 Days
Missing this deadline can lead to ex-parte assessment and penalties up to 100% of tax. Don't wait — read this guide and respond promptly.
Scrutiny Notice under Section 61 of CGST Act, 2017
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Getting an ASMT-10 notice can feel alarming, especially if it's your first one. But here's the thing — this notice is not a final demand. It's basically the GST officer saying, "We found something that doesn't match in your returns. Can you explain?"
ASMT-10 is a scrutiny notice issued under Section 61 of the CGST Act, 2017. It is triggered when a GST officer reviews your filed returns and spots discrepancies — typically between what you declared in GSTR-1 (your outward sales) and what you paid in GSTR-3B, or between your ITC claims and what shows up in GSTR-2B.
This is a routine part of the GST compliance system. The government uses data analytics to flag inconsistencies automatically — so if you got this notice, it doesn't necessarily mean you did something wrong. Sometimes it's a genuine data entry error, a timing difference, or a system mismatch. What matters is how you respond.
The notice will specify the exact discrepancy, the tax period in question, and your deadline to respond — which is 30 days from the date of the notice. You respond using Form ASMT-11 on the GST portal.
ASMT-10 notices are usually triggered by specific data mismatches that the GST system flags automatically. Here are the most common reasons:
GSTR-1 vs GSTR-3B Mismatch
The taxable turnover you declared in GSTR-1 (sales details) is different from what you reported in GSTR-3B (tax payment). Even small differences — like a ₹500 rounding error — can trigger this.
Excess ITC Claimed
The Input Tax Credit you claimed in GSTR-3B is higher than what appears in your GSTR-2B (auto-drafted ITC statement). This is one of the most common triggers in recent years.
E-Way Bill vs Return Mismatch
Your e-way bill data shows goods movement but the corresponding sales don't appear in your returns — or vice versa.
Nil Return with E-Way Bill Activity
You filed nil returns but e-way bills were generated during that period, indicating actual business activity.
Tax Rate Mismatch
You applied a different GST rate than what is notified for the goods or services supplied. For example, applying 12% where 18% is applicable.
Reverse Charge Non-Compliance
You received services that attract Reverse Charge Mechanism (RCM) but didn't pay the applicable tax.
Ignoring ASMT-10 is the worst thing you can do. Here's exactly what happens if you don't respond within 30 days:
| Situation | Consequence |
|---|---|
| No response within 30 days | Best judgement assessment — officer decides without your input |
| Genuine error, responded on time | Pay tax + 18% interest only. No penalty. |
| Tax fraud or suppression found | Penalty up to 100% of tax amount |
| Incorrect ITC, responded on time | 24% interest on excess ITC if not reversed promptly |
| Appealing the order later | 10% of disputed tax as pre-deposit required |
The key takeaway: if you respond on time and the discrepancy turns out to be genuine, you'll only pay the tax shortfall plus 18% interest per annum. That's manageable. But if you ignore it, the penalty can be as high as the tax amount itself — and you lose all negotiating leverage.
Here's exactly what you need to do, in order. Don't skip steps.
Read the Notice Carefully
The notice will mention: (a) the specific discrepancy found, (b) the tax period it relates to, and (c) your response deadline. Note all three before doing anything else. The deadline starts from the date on the notice, not when you receive it.
Gather Your Documents
You'll need: GSTR-1 and GSTR-3B filings for the mentioned period, GSTR-2B auto-drafted statement, all purchase and sales invoices for that period, bank statements if the officer has cited them, and any credit notes or debit notes issued.
Understand the Discrepancy
Match the specific figures the officer mentioned. Is it a genuine error you made? Or is there a valid explanation — like a timing difference (invoice in March, payment in April), or an amendment you filed later? Document your explanation clearly.
Calculate Your Actual Liability (if any)
If there is a genuine short payment, use our GST Interest Calculator to figure out the 18% interest you'll need to pay. Pay it before filing your response — it shows good faith and often leads to faster closure.
File Form ASMT-11 on the GST Portal
Login to gst.gov.in → Services → User Services → My Applications → View Additional Notices and Orders → Find your ASMT-10 → Click "Reply" → Fill ASMT-11 with your explanation and attach supporting documents → Submit.
Keep Proof of Submission
Download the acknowledgement after filing ASMT-11. Keep it safe. If the matter escalates later, this is your proof that you responded on time.
Before you start preparing your ASMT-11 reply, make sure you have all these documents ready. Missing even one can weaken your response:
Your ASMT-11 reply should be clear, factual, and supported by documents. Here are some common response templates depending on your situation:
If it's a timing difference:
"The discrepancy of ₹X in GSTR-1 vs GSTR-3B for the period [month/year] is due to an invoice dated [date] which was reported in GSTR-1 of [month] but the corresponding tax was paid in GSTR-3B of [next month] due to amendment. Supporting GSTR-1 amendment details and GSTR-3B payment proof attached."
If it's a genuine error you're accepting:
"Upon reconciliation, a short payment of ₹X is confirmed for the period [month/year]. The differential tax of ₹X along with interest under Section 50(1) amounting to ₹Y has been paid via DRC-03 challan dated [date]. Challan copy attached for your reference."
If the officer's calculation is incorrect:
"With respect, the discrepancy mentioned in the notice appears to be based on [specific issue]. Our records show that [explanation]. Detailed reconciliation statement and supporting invoices are attached for verification."
❌ Waiting until Day 29 to start
If you need a CA's help, you won't have enough time. Start immediately — give yourself at least 10 days buffer.
❌ Responding without checking the actual figures
Many businesses write a generic denial without reconciling the actual numbers. The officer will see through this and escalate.
❌ Not attaching supporting documents
Your ASMT-11 explanation without document proof carries no weight. Always attach reconciliation statements, invoices, or any evidence supporting your position.
❌ Paying the demanded amount without verifying
Sometimes the officer's calculation is wrong. Verify the figures independently before paying anything.
❌ Ignoring smaller discrepancies
Even a ₹1,000 discrepancy — if ignored — can result in a demand order that affects your credit rating and future GST compliance score.
These tools will help you calculate your actual liability and prepare your response:
GST Penalty Calculator
Calculate exact late fee + 18% interest for your case
GST Interest Calculator
Calculate 18% or 24% interest on tax shortfall
ITC Calculator
Verify your ITC eligibility and blocked credits
GSTIN Validator
Validate supplier GSTINs to verify ITC claims
AI Notice Explainer
Paste your actual notice for personalized analysis
All GST Notices
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Disclaimer: This guide is for educational and informational purposes only. GST notices have serious legal and financial implications. The information here is based on CGST Act provisions and general GST compliance practices. Every case is different — always consult a qualified Chartered Accountant or GST practitioner before responding to any official notice.
Last updated: March 2026 | Based on CGST Act 2017 and GST Council notifications