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Start by identifying the exact communication, tax period, allegation, reply deadline and required filing channel. Then reconcile the disputed input tax credit (ITC) invoice by invoice against the relevant supplier-return information, GSTR-2B and GSTR-3B, and your underlying records. Explain each variance with evidence and file through the process specified for that communication. A difference between GSTR-2A and GSTR-3B is not, by itself, proof that all the disputed credit is ineligible.
First identify which GST communication you received
“GST notice” can refer to different communications with different response procedures. Read the entire notice or intimation, including annexures, rather than choosing a reply form based on the mismatch alone. Record the form number, notice or reference number, issuing officer, tax period, date of service, stated due date and any portal instructions.
| Communication | What to check | Response route established by the cited official materials |
|---|---|---|
| FORM GST DRC-01C mismatch intimation | Particular tax period, mismatch figures and instructions in the intimation. | The GST Portal DRC-01C FAQ says to submit the response in Part B. It also warns that failure to respond to a previous-period intimation may block later GSTR-1/IFF filing. |
| Section 73 show-cause notice, including a DRC-01 summary where applicable | The allegations, period, proposed amount, deadline and procedure stated in the notice. | Follow the notice and the applicable statutory process. Section 73 provides a notice and pre-notice payment framework for matters within its scope; it is not the DRC-01C Part B process. |
| Audit discrepancy communication | The audit observations, records requested, response date and stage of the audit. | Follow the audit communication. CGST Rules Rule 101 addresses a reply to audit discrepancies before findings are finalised. |
These routes are not interchangeable. A reply submitted for one communication should not be assumed to answer a separate notice or audit query. If the communication does not clearly state its route or deadline, seek clarification promptly from the issuing authority or a qualified GST professional instead of waiting until the due date.
Apply the ITC rules for the period in the notice
The issue is not simply whether a number in GSTR-2A equals a number in GSTR-3B. Under CGST Act section 16(2)(aa) and CGST Rules Rule 36, supplier furnishing of invoice or debit-note details and their communication to the recipient are material to the ITC conditions; Rule 36 refers to FORM GSTR-2B. Other eligibility conditions and the supporting documents also matter.
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The relevant tax period is essential. Do not apply today’s wording or process automatically to an earlier period: check the law, rules and any applicable period-specific measures for the period under review. The official materials cited here do not establish one blanket numerical tolerance for every GSTR-2A/GSTR-3B mismatch.
A portal view can also change when a supplier files or amends a return. Save dated extracts relevant to the period and explain later supplier filings or corrections, rather than relying only on the portal’s current view. A changing display may help explain timing, but it does not by itself establish that every condition for claiming the credit was met.
Reconcile the disputed credit invoice by invoice
Build a period-wise working that lets the officer trace every disputed amount from the notice to the return and supporting records. Use one row per invoice, debit note or other credit item in issue, and separate the tax heads where relevant.
| Reconciliation field | What to record |
|---|---|
| Source document | Supplier GSTIN, invoice or debit-note number and date, taxable value, and tax amounts by applicable head. |
| Period and return treatment | Period in which the credit was claimed, corresponding GSTR-3B entry or reversal, and the relevant supplier-reporting or GSTR-2B appearance. |
| Notice comparison | Amount alleged in the notice or intimation, your reconciled amount and the exact variance. |
| Explanation and evidence | Reason for the variance and the annexure or record supporting that explanation. |
Classify a difference only when the records support the explanation. Possible causes include supplier filing or timing, a clerical mismatch, a duplicate, ineligible credit, a reversal, import documentation or another accounting treatment. Keep “a numerical difference exists” separate from “the credit fails a legal eligibility condition”; the latter must be assessed against the applicable law and facts.
Match evidence to the allegation
There is no single attachment list that suits every ITC mismatch notice. Select records that substantiate each line of your reconciliation and address the specific point raised. Depending on the facts, relevant records may include:
- Tax invoices or debit notes and the purchase register.
- Dated GSTR-2B and GSTR-3B extracts for the relevant period, along with any useful dated supplier-reporting or portal records.
- Evidence of receipt of the goods or services, such as appropriate business, delivery or service records.
- Accounting ledger entries and payment records where relevant to the allegation.
- Supplier correspondence and evidence of a subsequent filing or correction.
- Bill of entry or other import records where the disputed credit relates to imports.
- Workings and supporting records for a reversal, adjustment or later correction.
CGST Rules Rule 36 addresses documents for availing credit, while section 16 sets out eligibility conditions, including receipt and supplier communication. Which documents matter depends on what the notice alleges; attaching a large bundle without linking it to the disputed entries makes the explanation harder to verify.
Draft a numbered, evidence-backed reply
Answer each allegation or discrepancy separately. A useful reply connects the authority’s figure to your records and makes clear which part, if any, remains disputed. Organise the response so the reader can move directly from a notice item to the reconciliation and its evidence.
- Identify the proceeding. State the GSTIN, communication number and form, communication date, tax period and reply date. Confirm which communication the submission answers.
- Address each discrepancy. For every item, state the amount alleged, your reconciled amount, the variance, the reason for it and the supporting annexure reference.
- Explain the period-specific treatment. Set out the relevant return periods and applicable ITC conditions, and explain the supporting facts, such as the document, receipt evidence or supplier reporting, where relevant.
- Separate accepted from disputed amounts. If a portion is accepted, identify it and show its calculation and any payment already made with proof. Do not make a blanket admission or denial that the records do not support.
- State the request. Ask that the supported explanation and records be considered and that the substantiated differences be dropped. Where the applicable process permits and the circumstances warrant it, request a personal hearing.
- Verify and sign. Have the reply completed and signed by the appropriate authorised person, with annexures clearly identified.
This is a drafting framework, not a ready-to-file legal reply. Do not invent figures, notice references, dates or a defence. If requesting a hearing, extension or other procedural relief, follow the requirements of the particular proceeding.
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For a DRC-01C intimation, submit the response in Part B through the GST portal, as described in the portal FAQ. The FAQ warns that a missing response for a previous-period DRC-01C may prevent later GSTR-1/IFF filing. For a statutory notice, audit communication or other proceeding, use the channel and process stated for that communication; Rule 101 separately addresses audit-discrepancy replies.
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Before filing, check that the response addresses the right period and communication, that attachments open and are legible, and that the figures in the reply agree with the reconciliation. Save a copy of the filed response, every attachment and the portal acknowledgement or other filing proof.
Decide whether to dispute, correct or pay
Payment is a decision to make after checking the reconciliation and applicable law, not an automatic response to a mismatch. Do not pay solely to make a portal difference disappear if the credit is supportable; equally, do not continue claiming credit that the facts and rules applicable to the period do not support.
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A GST Portal functionality note has listed ITC mismatch as a reason for FORM GST DRC-03 voluntary payment. That describes a payment facility, not a finding that a particular proposed demand is correct or that payment is appropriate in every case. For an amount you accept, verify the calculation, tax, interest, payment route and any penalty consequences in the context of the actual proceeding. Section 73’s notice and pre-notice payment framework applies only to cases within its scope, and the appropriate treatment cannot be determined without the notice and records.
Get a qualified Indian GST practitioner to review a material or contested demand, disputed legal interpretation, multiple tax periods, or a matter that may proceed to adjudication or appeal. A professional can assess the notice and period-specific rules; a generic mismatch figure cannot resolve those questions on its own.
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