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Your GSTR-3B for August claims input tax credit of ₹18.42 lakh. The GSTR-2B for the same month shows ₹16.96 lakh. Three months later an email from the jurisdictional officer asks you to explain the gap, and the accounts team is unsure whether to file a reply, chase the supplier, or simply reverse the credit. An ITC mismatch notice under GST is rarely one problem; it is usually four or five small ones sitting in the same purchase register. This article explains where the gap comes from, which notice you have actually received, and how to answer it with documents instead of assurances.
The chain has three links. The supplier reports the invoice in its GSTR-1. The GST system then compiles those reported invoices into your GSTR-2B, a static statement generated for each tax period under section 38 of the CGST Act, 2017. You then claim credit in the GSTR-3B for the period in which you choose to claim it. Nothing in the chain happens automatically on your side: the supplier's filing controls what appears in your 2B, and your 3B is your own declaration.
Two provisions explain why the department treats a gap seriously. Section 16(2)(aa) makes it a condition of eligibility that the invoice details have been furnished by the supplier and communicated to you in the statement under section 38. Section 155 places the burden of proving eligibility for credit on the person claiming it. So when the officer asks why your claim exceeds your 2B, the statute begins from the assumption that you must prove the credit, not that the department must disprove it.
One point of comfort. Section 16(4) allows you until 30 November of the following financial year to claim credit relating to a financial year. An invoice that appears in the 2B of December can still be claimed in the 3B of December or later, provided that deadline has not passed. A timing difference inside the year is not, by itself, a lost credit.
This is the single largest cause. GSTR-2B is generated from what suppliers have actually filed, so a supplier who files GSTR-1 in December for an August invoice leaves your August 2B short. Small suppliers often file quarterly under the QRMP scheme, which means their invoices reach your 2B in the month after the quarter ends. Check the supplier's filing status on the GST portal before assuming default.
A single transposed digit in your GSTIN, a mismatch between the invoice number in the supplier's books and yours, or an invoice reported as a B2C sale instead of B2B will all keep the credit out of your 2B. So will a supplier who reports the invoice under your old GSTIN after a change in constitution or place of business. These are reporting errors, not substantive ones, but the portal cannot tell the difference.
If the supplier charged IGST on an intra-state supply, or CGST and SGST on an inter-state one, the credit posted to your electronic credit ledger will not match the head under which you are entitled to use it. Place of supply disputes on services, particularly where the recipient's location is disputed, produce the same result.
Credit notes issued by the supplier but not adjusted by you, import and ISD credit that arrives through a different route, blocked credits under section 17(5) claimed by mistake, and invoices the supplier has since cancelled. Each has a different fix.
The form number tells you how far the department has gone. Read the reference number and the section quoted before you draft anything. The forms below are prescribed under the CGST Rules and CBIC circulars.
| Form | Legal basis | What it means | Your response |
|---|---|---|---|
| ASMT-10 | Section 61 read with Rule 99 | Scrutiny of returns; the officer has found a discrepancy and wants an explanation | Reply in ASMT-11, ordinarily within 30 days, with a reconciliation and evidence |
| DRC-01A Part A | Rule 142(1A) | Intimation that tax has been ascertained as payable; invites voluntary payment | Either pay with interest in DRC-03, or object in writing with reasons |
| DRC-01A Part B | Rule 142(1A) | Notice demanding the ascertained amount, issued where Part A is not paid | Reply within the time stated, with the same evidence |
| DRC-01 | Rule 142(1) | Summary of a show cause notice issued under section 73, 74 or 74A | Full reply with documents; verify the demand period first |
| DRC-01C | Rule 88D | System-generated intimation where 3B credit exceeds the 2B figure beyond the prescribed limit | Explain the difference, or accept it in Part B of the form |
An email from the officer, with no form attached, is not a statutory notice. It is also not something to ignore. Most ASMT-10 notices are preceded by an informal request, and silence usually converts the email into a formal notice. Reply to the email, keep the acknowledgement, and state your position in writing even if the reconciliation is still incomplete.
Mind the time limits. Section 61(3) allows the officer to proceed under section 73 or 74 where the explanation is not satisfactory. The 2024 amendment standardised the outer limit for such demands at 42 months from the due date of the annual return, and demands for financial years from 2024-25 onwards are governed by section 74A. A quick, documented reply at the ASMT-10 stage is almost always cheaper than a reply to a show cause notice.
Totals will not solve this. You need a line-by-line match on four fields: supplier GSTIN, invoice number, invoice date and tax amount. Download GSTR-2B for each month from the GST portal in Excel, export the purchase register for the same months, and match. The result normally falls into four buckets: matched, in books but not in 2B, in 2B but not in books, and matched with a value or tax head difference. Only the second and fourth buckets explain an excess claim; the third explains an under-claim, which you can correct in a later period.
Sahyadri Traders, a Pune distributor of industrial fasteners, filed its GSTR-3B for August 2024 with ITC of ₹18,42,000. The GSTR-2B for August showed ₹16,96,000. The officer's email in March 2025 asked for an explanation of the ₹1,46,000 difference. Reconciliation produced three reasons.
First, ₹92,400 of credit related to an invoice from Konark Industries dated 12 August 2024. Konark filed its GSTR-1 on 6 December 2024, so the invoice surfaced in the 2B of December, not August. Second, ₹38,500 related to an invoice where the supplier had entered Sahyadri's GSTIN with one digit transposed; that credit never reached Sahyadri's 2B at all. Third, ₹15,100 was a local purchase the supplier had reported as a B2C sale, so the invoice was never tagged to Sahyadri's GSTIN.
The reply hid nothing. For the first item, Sahyadri attached the December 2B showing the invoice and confirmed the credit fell within the section 16(4) window. For the second, it produced a corrected invoice from the supplier and a copy of the supplier's amended GSTR-1. For the third, it reversed ₹15,100 with interest in DRC-03 before the scrutiny turned into a demand. The officer dropped that item and the rest of the file needed no payment.
The reply in ASMT-11, or to a DRC-01A, should do three things in order: state the total difference, break it into reasons with rupee amounts, and attach one document per reason. Prose without numbers invites a second notice. Attach the reconciliation sheet as a working paper, not as a substitute for the underlying documents.
Download GSTR-2B and GSTR-2A for every month in the disputed period and keep the date-stamped files
Match invoice by invoice on GSTIN, invoice number, date and tax amount, and save the working sheet with your reply
For each missing invoice, obtain the supplier's GSTR-1 acknowledgement or a screenshot of its filed return showing your GSTIN
Keep bank statements or payment advices proving the tax was paid to the supplier, which goes to section 16(2)(b)
Where the supplier has not filed, send a written request and record the date; do not claim that credit again until it appears in 2B
Where credit was wrongly availed, reverse it in DRC-03 with interest under section 50 before the show cause notice stage
File the reply in the correct form, download the acknowledgement, and diarise a follow-up date 30 days later
Supplier follow-up is the weak link in most files. You cannot compel a supplier to file, and the department will not accept "he has promised to file" as a defence. What you can do is document the request, and where the commercial relationship allows, hold back the tax component of the payment until the supplier's return is filed.
The choice turns on whether the transaction is real and documented. If the goods or services were received, the tax was paid to the supplier and the only failure is the supplier's filing, defend the credit with evidence and pursue the supplier in parallel. If the invoice is genuine but the supplier has vanished, or the credit was claimed twice, pay.
Payment before a show cause notice is cheaper. Under section 73(5), and the corresponding provision in section 74A for later years, a person who pays the tax with interest before notice is issued is not liable to penalty. Once a notice under section 73 is issued, the penalty is 10% of the tax or ₹10,000, whichever is higher. Under section 74, which applies where fraud or suppression is alleged, the penalty equals the tax itself. Interest runs at 18% per annum under section 50(1), and the rules distinguish between credit merely availed and credit actually utilised, so a reversal before utilisation usually costs less.
Replying with a total figure and no invoice-level breakup. Reversing credit by book entry without paying it through DRC-03, which leaves the electronic credit ledger untouched and the liability alive. Claiming the same invoice again in a later 3B after reversing it. Ignoring a DRC-01C because it looked like a system message. Treating a supplier's verbal assurance as evidence. The statutory text and rules are on India Code and the GST Council site if you need to quote them in a reply.
Tax invoices with e-way bills where applicable, the purchase register, GSTR-2B and 2A extracts, proof of the supplier's GSTR-1, payment proofs, the reconciliation working sheet, DRC-03 acknowledgements, and every reply filed with its acknowledgement. Retain them at least until the demand period expires, which in practice means keeping them well beyond the year of filing.
Start with the reconciliation, not the reply. Pull the GSTR-2B for each disputed month and the matching purchase register entries today, and mark every invoice that sits in your books but not in the statement. That one sheet tells you whether the gap is a timing issue, a supplier problem or a genuine reversal, and it is the first thing the officer will ask for.
This article is for general information only and is not legal advice. Consult a qualified professional for your specific facts.
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