GST ASMT-10 Notice: How to Respond in 30 Days

GST ASMT-10 Notice: How to Respond Within 30 Days

An ASMT-10 notice under Section 61 of the CGST Act 2017 is a scrutiny notice — not a demand notice. The GST officer is asking you to explain discrepancies found between returns you've already filed. Ignoring it or responding inadequately triggers ASMT-11 followed by a best-judgement assessment under Section 63, which can result in tax demands with 18% interest and penalties up to 100% of tax due.

This guide explains what triggers an ASMT-10, how to read the notice, and how to respond through the GST portal within the 30-day window.

What is ASMT-10?

ASMT-10 is a scrutiny notice issued under Section 61 of the CGST Act 2017. The Proper Officer issues it when the automated system or manual review detects discrepancies in returns filed by a taxpayer.

Key characteristics:

It is a scrutiny notice, not a show-cause notice or demand
It requires your explanation and supporting documents
Response deadline: 30 days from the date of issue (extendable by officer)
Response filed via GST portal under the Notices and Orders section

Common Triggers for ASMT-10

The GST system cross-matches data across multiple returns and databases. The most frequent triggers:

Step-by-Step Guide

ASMT-10 Trigger Scenarios — Most Common Discrepancies

GSTR-1 vs GSTR-3B Mismatch

Outward supplies declared in GSTR-1 differ from the tax paid in GSTR-3B. System flags if GSTR-1 turnover exceeds GSTR-3B declared supplies by more than a threshold

GSTR-3B vs GSTR-2A/2B ITC Mismatch

ITC claimed in GSTR-3B exceeds what appears in GSTR-2B (auto-populated from supplier filings). Excess ITC claims are the most frequent trigger

E-way Bill vs GSTR-1 Mismatch

E-way bills generated for outward movement not reflected in GSTR-1 declared turnover

Annual Return vs Monthly Return Mismatch

GSTR-9 (annual) figures differ from consolidated GSTR-1 and GSTR-3B totals for the same financial year

HSN Summary Discrepancy

HSN-wise summary in GSTR-1 does not reconcile with tax rates actually charged; or HSN codes changed across months inconsistently

Reverse Charge Liability Gap

Transactions subject to reverse charge mechanism (RCM) declared in GSTR-3B Table 3.1(d) do not match inward supplies attracting RCM

Source: Section 61 CGST Act 2017; CBIC Scrutiny Guidelines Circular No. 163/19/2021-GST

How to Read the ASMT-10 Notice

The notice has a standard format. Key sections to identify:

1. Notice Reference Number — Used when filing your response (ASMT-11). Format: ZZ123456789.

2. Tax Period — Which month(s) or financial year the discrepancy relates to.

3. Table of Discrepancies — Lists each specific mismatch:

Description of discrepancy (e.g., "GSTR-1 turnover exceeds GSTR-3B by ₹X")
Amount of discrepancy
Type (ITC-related, outward supplies, tax payment)

4. Documents Required — What supporting evidence the officer wants to see (invoices, reconciliation sheets, bank statements).

5. Response Deadline — Usually 30 days from issue date. Note the exact date — late responses are treated as non-compliance.

ASMT-10 notices received on the portal may not generate an email alert. Log in to your GST portal account under Services → User Services → View Notices and Orders at least once a month. Notices can lapse unnoticed if you rely only on email.

Preparing Your Response

Before filing on the portal, prepare a reconciliation document for each discrepancy listed.

For GSTR-1 vs GSTR-3B Mismatch

Common legitimate reasons:

Credit notes issued in the subsequent month (reduces GSTR-3B liability, not GSTR-1 of prior month)
Advances received (GSTR-3B Table 11 declarations) not yet invoiced in GSTR-1
RCM supplies declared in GSTR-3B Table 3.1(d) but not appearing in GSTR-1 (RCM purchases are inward — correct)
Data entry errors corrected in later returns (amendments filed in GSTR-1)

Comparison

GSTR-1 vs GSTR-3B: Legitimate Mismatch Reasons vs Errors

Parameter	Legitimate (Explain and Justify)	Actual Error (Pay Differential + Interest)
Credit notes issued next month	GSTR-1 higher — credit note reduces liability next period, not retroactively	Turnover genuinely understated in GSTR-3B — pay differential
Advance receipts	GSTR-3B includes advance GST; GSTR-1 will show invoice later	Invoice issued but not declared in GSTR-1 — amend GSTR-1
ITC reversal	Reversed ITC in GSTR-3B Table 4(B) reduces net ITC — explain with invoice-wise details	ITC claimed on ineligible invoices — reverse and pay with interest
B2C aggregate mismatch	B2C sales below ₹2.5 lakh per state in GSTR-1 vs GSTR-3B rounding differences	Systematic under-declaration of B2C turnover — pay differential

Takeaway: For each discrepancy, first check if it is a timing or classification difference before assuming it is an error requiring tax payment.

For ITC Mismatch (GSTR-2B vs GSTR-3B)

Acceptable reasons:

Supplier filed GSTR-1 late — ITC appeared in 2B after you filed 3B
IGST available as per GSTR-2B but distributed among branches (ISD entries)
Transitional credit (TRAN-1) not reflected in 2B

Documentation to collect:

Supplier invoices for all ITC claimed
Reconciliation statement (invoice-wise ITC vs GSTR-2B)
Proof of payment to supplier (Section 16(2)(b) condition)

How to Respond on the GST Portal (ASMT-11)

Your reply to an ASMT-10 is filed as Form ASMT-11 on the GST portal.

Step-by-Step Guide

Step-by-Step: Filing ASMT-11 Response on GST Portal

Go to www.gst.gov.in → Login with GSTIN and password

Navigate to Notices

Dashboard → Services → User Services → View Notices and Orders

Open ASMT-10

Find your ASMT-10 notice in the list. Click 'View' to read the full discrepancy table

Click Reply

Click 'Reply' button against the ASMT-10 notice. System opens ASMT-11 response form

Enter Response Details

For each discrepancy listed, enter: (a) whether you agree or disagree, (b) explanation text, (c) amount agreed/disputed

Upload Supporting Documents

Attach reconciliation Excel, invoices, credit note register, bank statements as PDF — max 5MB per file

Preview and Submit

Review draft response → click 'Submit'. Use DSC or EVC to authenticate the submission

Download Acknowledgment

Save the acknowledgment number (ARN) generated after submission — needed for tracking

Source: GST Portal — Services → User Services → View Notices and Orders

If You Agree with the Discrepancy

If the officer is correct and you did under-declare tax or over-claim ITC:

Agree in ASMT-11 — select "Agree" against that discrepancy
Pay the differential tax — via DRC-03 (voluntary payment form)
Pay interest at 18% per annum — calculated from the due date of the original return to the date of payment
Penalty — if you accept liability and pay before adjudication, penalty may be reduced to 10% of tax (Section 73(8))

Paying via DRC-03 before an order is passed is treated favorably by officers. It reduces the risk of escalation to a show-cause notice under Section 73/74 and limits penalty exposure.

If You Disagree with the Discrepancy

If the officer's basis is factually incorrect:

Disagree in ASMT-11 — select "Disagree" against that discrepancy
Provide detailed explanation — mention the specific legal provision, Circular, or factual reason
Attach documentary evidence — invoices, GSTR-1 amendments, supplier communication

If the officer accepts your explanation, the matter closes. If not, the officer can issue a demand order under Section 61(3). You can then appeal to the First Appellate Authority within 3 months.

Deadlines and Consequences

Deadline Timeline

ASMT-10 Response Timeline

Day 0
ASMT-10 Issued
Notice appears in your GST portal under View Notices and Orders
Day 30
ASMT-11 Response Deadline
Must file your reply by this date. Extension possible if requested with valid reason before deadline
After Day 30 (no reply)
Best-Judgement Assessment Risk
Officer can assess tax liability ex-parte under Section 63 if no response filed
Post-Order
DRC-07 Demand Order
If officer rejects your reply, demand order issued. Appeal to First Appellate Authority within 3 months

If you need more than 30 days, apply for extension before the deadline expires — write to the Proper Officer via the portal or offline letter. Officers typically grant 15–30 additional days for complex multi-year discrepancies if applied in advance.

Frequently Asked Questions

Q: Can ASMT-10 be issued for past years?
A: Yes. Officers can issue ASMT-10 for any return filed within the normal 5-year limitation period (extendable to 7 years in fraud cases under Section 74).

Q: Does ASMT-10 affect my GST registration?
A: Not directly. But persistent non-compliance or confirmed large evasion detected through ASMT-10 proceedings can eventually lead to a suspension or cancellation proceeding under Section 29.

Q: I filed my return correctly. Why did I get ASMT-10?
A: The system generates discrepancy notices algorithmically. Even technically correct returns can trigger notices due to supplier non-filing, timing differences in B2B ITC, or formatting variations in HSN codes. Respond with your reconciliation — notices close routinely once explained.

Q: What if my CA never informed me about the notice?
A: ASMT-10 is issued to the taxpayer's GST portal account and registered mobile/email. As the registered taxpayer, the legal responsibility to respond remains yours. Ensure your CA has active access to your portal.

Sources: Central Goods and Services Tax Act 2017 — Sections 61, 63, 73, 74; CGST Rules 2017 — Rules 99, 100; CBIC Circular No. 163/19/2021-GST (Scrutiny of Returns). All figures and provisions as applicable to FY 2025-26 returns under review. For notice-specific advice, consult a GST practitioner or Chartered Accountant.