ASMT-10 : GST Notice
- Legal Sections
- 31 Aug, 2026
ASMT-10 GST Notice
30-Day Reconciliation Checklist for Exporters & Manufacturers
A. What is ASMT-10 — and Why You Cannot Ignore It
An ASMT-10 notice is issued by the GST department under Section 61 of the CGST Act when their system detects a discrepancy in your filed returns typically a mismatch between GSTR-1, GSTR-3B, and GSTR-2B.
For exporters and manufacturers with high ITC volumes, this notice arrives more often than you may expect. The department's AI-based scrutiny engine runs 24/7. It compares your outward supply declarations, your IT claims, and what your suppliers have reported. If the numbers don't align even due to a timing difference an ASMT-10 lands in your GST portal inbox. Ignoring or under-responding to this notice is where most businesses hurt themselves. A generic or incomplete reply can trigger ITC reversal, 18% interest on the disputed amount, and penalties ranging from ?25,000 up to ?5,00,000. Future returns and refund claims can also come under increased scrutiny.
Critical: You have exactly 30 days from the notice date to submit your reply. Missing this deadline or filing an incomplete response almost always worsens the situation.
B. Step 1 Basic Sanity Checks (Do This First)
Before you open a single spreadsheet, verify the notice itself:
• Confirm the notice number, GSTIN, and the tax period it covers.
• Note the issuing officer's name, designation, and jurisdictional range.
• Check the exact due date for reply count calendar days, not working days.
• Confirm the mode of communication: GST portal inbox, email, or physical service.
• Download and save the original notice PDF from the GST portal immediately.
• Identify the specific discrepancy mentioned is it outward supplies, ITC, or export turnover?
• Check whether this is a standalone notice or part of a series of assessments for multiple periods.
Common mistake: Many taxpayers assume the notice will "go away" or that their return filing is sufficient protection. Yahi galti sabse zyada hoti hai. A filed return and a replied notice are two completely different things.
C. Step 2 GSTR-1, 3B, and 2B Reconciliation Checklist
C1. Outward Supplies GSTR-1 vs. GSTR-3B
• Download GSTR-1 and GSTR-3B for the relevant period(s) from the GST portal.
• Prepare a table comparing taxable turnover, tax-free turnover, and zero-rated exports declared in each return.
• Identify invoices or credit notes reported in GSTR-1 but not reflected in GSTR-3B (Table 3.1).
• Flag the reverse amounts in GSTR-3B that are higher or lower than GSTR-1 declarations.
• Quantify the exact tax impact of each mismatch (CGST, SGST, IGST separately).
• For amendments filed in later periods, trace them back and mark them as timing differences, not genuine errors.
C2. ITC Claimed — GSTR-3B vs. GSTR-2B
• Download GSTR-2B for the relevant period and compare with ITC claimed in GSTR-3B (Table 4).
• Flag all suppliers whose invoices appear in your books but are absent from GSTR-2B.
• Classify the reason for each missing invoice: late supplier filing, wrong GSTIN, cancelled invoice, or genuine error.
• Check whether you have claimed ITC beyond the 2B-reflected amount this is a primary trigger for ASMT-10.
• Identify RCM liabilities declared and ITC availed on the same confirm the offset treatment.
C3. Export Turnover and Zero-Rated Supplies
• Match shipping bills against GSTR-1 Table 6A (exports under LUT) and Table 6B (IGST paid exports).
• Verify that FIRC/BRC has been received for all foreign currency remittances against exports.
• Confirm that LUT/Bond was valid and active for the period under scrutiny.
• Reconcile refund claims filed (IGST paid or accumulated ITC) against exports declared in GSTR-1
Pro-tip: Build a single master Excel sheet with GSTR-1, 3B, and 2B side by side using VLOOKUP or Power Query. The department expects to see this; presenting it proactively shows you are in control of your numbers.
D. Step 3 Document Checklist: What to Keep Ready
D1. Sales / Outward Side
• All GST tax invoices for the period (soft copies, organised by invoice number).
• Export shipping bills with customs-certified copies where applicable.
• Copy of Letter of Undertaking (LUT) or Bond filed with the jurisdictional authority.
• FIRC / BRC for all export realisation bank-certified copies preferred.
• E-way bills for high-value domestic supplies where applicable.
• Debit/credit notes issued during the period and their accounting entries.
D2. Purchase / ITC Side
• Purchase invoices for all ITC claimed original or scanned copies with supplier GSTIN.
• E-way bills for inward supplies above the threshold limit.
• Payment proofs (bank statements, RTGS/NEFT confirmations) for all purchases where ITC is claimed.
• Supplier reconciliation statements including communications to vendors who filed late.
• Goods receipt notes or delivery challans for physical goods received.
D3. Additional / Correspondence
• All prior correspondence with the GST department for this GSTIN and period.
• Any earlier show-cause notices, replies filed, or assessment orders for overlapping periods.
• CBIC circulars or department notifications relevant to the nature of the discrepancy.
E. Step 4 — Analytical Checks Before Drafting Your Reply
Before you write a single word of your reply, complete this analysis:
• Quantify the exact ITC or tax amount disputed by the department versus your own working rupee for rupee.
• Categorise each mismatch as: (a) Genuine error on your part, (b) Timing difference supplier filed late, (c) Department's misreading of your data.
• Decide clearly which mismatches you will accept and reverse, and which you will contest with documentary support.
• For items you are reversing, prepare DRC-03 (voluntary tax payment) before or alongside your reply this demonstrates good faith.
• For items you are contesting, prepare a concise written explanation for each, supported by invoice numbers, dates, and supplier details.
• Preserve all working papers and Excel reconciliations. These become evidence if the matter escalates to adjudication.
Common mistake: Do not admit liability casually in the opening lines of your reply. A poorly worded admission even for a small amount can be used to confirm demand for the full disputed amount.
F. Step 5 Drafting the Reply: What to Include
A proper ASMT-10 reply is not a letter, it is a structured submission. At a minimum, it should contain:
• Reference to the notice number, GSTIN, tax period, and the specific discrepancy raised.
• A brief factual background of the business nature of operations, export / domestic split, ITC volume.
• A summary reconciliation table showing the department's observation, your working, and the net difference.
• Explanation of each reconciling item timing differences, amendments, supplier defaults with supporting document references.
• Confirmation of any voluntary reversal made via DRC-03, with challan reference.
• A complete annexure list: invoices, bank statements, e-way bills, FIRC/BRC, LUT, and any other attachments.
• A polite closing line requesting that the proposed demand be dropped or adjusted to the extent of the reconciliation.
Pro-tip: Keep the reply factual and numbered. Officers deal with hundreds of replies; a well-structured submission with a clear summary table is read more carefully and resolved faster than a narrative letter.
G. Pro-Tips & Red Flags
Pro-Tips
• Do not submit an incomplete reconciliation hoping the department will "figure it out." Incomplete working invites further notices.
• Cross-check all figures with your books of accounts ITR, balance sheet, and GST returns should tell one consistent story.
• If your supplier has filed late and the invoice is now reflected in a subsequent 2B period, include proof of that filing date.
• Maintain a log of all filings, payment challans, and correspondence with a date and reference number — this becomes invaluable during scrutiny.
• When in doubt on any technical point — especially on export ITC refunds, RCM, or transitional credit —consult a professional before filing the reply.
• File the reply well before the 30-day deadline — portal technical issues at the last minute are not accepted as grounds for extension.
Red Flags That Increase Risk of ITC Reversal
• One or more suppliers on your purchase list are non-filers or have been suspended on the GST portal.
• ITC claimed in the current year shows a significant jump versus the previous year without a proportionate increase in turnover.
• Invoices without corresponding e-way bills for goods that ordinarily require one.
• Payment to suppliers made in cash or through third-party accounts — not through your business bank account.
• Mismatches that carry forward across multiple tax periods without prior clarification.
H. Quick Checklist — 15 Points Before You Submit Your Reply
Use this as a final quality check before uploading your reply on the GST portal:
1. Notice details confirmed: GSTIN, period, due date, officer name.
2. Original notice downloaded and saved from the GST portal.
3. GSTR-1, 3B, and 2B downloaded and reconciled for the disputed period.
4. Master reconciliation Excel prepared with all three returns side by side.
5. Each mismatch categorised: genuine error / timing difference / department's error.
6. Decision made on what to accept (reverse) and what to contest (defend).
7. DRC-03 filed for all amounts being voluntarily reversed, challan in hand.
8. All sales-side documents ready: invoices, shipping bills, LUT, FIRC/BRC.
9. All ITC-side documents ready: purchase invoices, e-way bills, payment proofs.
10. Supplier reconciliation prepared; non-filers and late filers separately noted.
11. Reply draft reviewed for accuracy no casual admissions, no unsupported claims.
12. Summary reconciliation table included in the reply body.
13. All annexures numbered, labelled, and referenced in the reply.
14. Reply checked against GSTIN no data from the wrong period or entity.
15. Reply submitted on the GST portal at least 3 days before the due date
I. What Next?
Save this checklist and share it with your finance team or CFO, it is most useful when the entire accounts team is aligned before the reply is drafted.
If you have already received an ASMT-10 and need a professional review of your reply or if you want a detailed reconciliation template tailored to your business reach out directly.
Prepared by CA Dhiraj Ostwal | GST & Business Advisory | CA Dhiraj Ostwal & Associates