Direct Answer: To reply to an automated Form DRC-01C (Part A) notice under Rule 88D, log in to the GST Portal, navigate to Services > Returns > Return Compliance > ITC Mismatch (DRC-01C), and submit Part B within 7 days. You must either pay the excess Input Tax Credit (ITC) along with applicable interest under Section 50 via Form DRC-03, or select one of the predefined reason categories in Part B (such as ITC claimed on re-import/re-credit, prior-period ITC claimed late under Section 16(4), or clerical typos in GSTR-3B Table 4) supported by an invoice-level reconciliation sheet. Failure to submit Part B within 7 days automatically blocks your outward return filing (GSTR-1 / IFF) for subsequent tax periods.
If the invoice is stuck in IMS, our guide to IMS pending invoices explains what it costs and whose action clears it.
Form DRC-01C is not an ordinary scrutiny notice issued at an officer's personal discretion. It is a system-generated intimation under Rule 88D of the CGST Rules, triggered automatically whenever the net ITC claimed in your GSTR-3B exceeds the eligible ITC available in your auto-generated GSTR-2B, by more than a pre-defined limit set on the GST Council's recommendation.
This operational guide breaks down the legal architecture of Rule 88D, provides the exact text templates for Part B explanations, explains when Section 50(3) interest is mandatory versus exempted, and outlines how to prevent automatic GSTR-1 lockouts.
Understanding the Rule 88D Workflow
Rule 88D was inserted into the CGST Rules to enforce mechanical compliance between inward statements and return claims. The entire sequence operates on a strict statutory timer:
| Timeline Phase | Trigger Event | Statutory Requirement | Consequence of Default |
|---|---|---|---|
| Day 0 (Filing) | GSTR-3B submitted with ITC exceeding GSTR-2B. | The portal compares the ITC claimed in GSTR-3B with the ITC available in GSTR-2B. | If delta exceeds threshold, Part A of DRC-01C is issued to registered email/portal. |
| Days 1 to 7 | Receipt of DRC-01C intimation. | Taxpayer must access portal and submit response in Part B. | Statutory window to explain genuine timing differences or pay excess tax via DRC-03. |
| Day 8 Onwards | No Part B submitted OR reply found unsatisfactory. | Portal invokes Rule 59(6)(e). | GSTR-1 / IFF is blocked automatically. The next GSTR-1 or IFF cannot be filed until Part B is answered. |
The Two Permitted Responses in DRC-01C (Part B)
When you open Form DRC-01C Part B on the common portal, you are presented with two distinct paths:
Option 1: Pay the Excess ITC Claimed (with Section 50 Interest)
If you genuinely made an error, such as claiming ineligible credit under Section 17(5), entering ₹18,00,000 instead of ₹1,80,000, or claiming invoices that the vendor never uploaded, you must reverse the excess credit.
Example of an ITC mismatch reply involving payment
Consider a trading company that accidentally claimed an invoice twice in its GSTR-3B.
| Document | ITC in GSTR-2B | ITC claimed in GSTR-3B | Action required |
|---|---|---|---|
| September returns | ₹1,50,000 | ₹1,95,000 | Reply in Part B |
| Excess claim | ₹45,000 | Pay the excess |
In this case, the company should pay the ₹45,000 excess credit, plus interest at 18% a year if the excess was used to pay tax (see the interest section below). After payment, they must update the details in Part B of Form DRC-01C and submit it.
- Generate a challan under Services > User Services > My Applications > Form DRC-03.
- Select the cause of payment "ITC mismatch - GSTR-2A/2B to GSTR-3B", as the GSTN advisory specifies for DRC-01C.
- Deposit the tax, plus interest at 18% a year under Section 50(3) for the period the excess credit was used, if it was used.
- Enter the ARN of the DRC-03 payment in Part B of DRC-01C and validate the challan.
Option 2: Provide Reasons for the Difference (No Tax Payment)
If your ITC claim is legally valid and substantiated by accounting records, you do NOT have to repay the tax. You must select one or more predefined reasons from the drop-down menu in Part B, provide a narrative description, and add a remark (up to 500 characters) and upload a supporting PDF (up to 500 KB).
Decoding the Predefined Part B Reason Codes
The GST portal provides specific drop-down categories in DRC-01C Part B. Choosing the right reason code is critical for swift closure:
| Reason (match it to the closest option in the portal drop-down) | Applicable Business Scenario | Required Documentary Evidence |
|---|---|---|
| Reason A: Input Tax Credit not availed in earlier periods | Invoices appeared in a prior month's GSTR-2B (e.g., May), but were claimed in the current GSTR-3B (e.g., September) within the Section 16(4) deadline. | Cross-period reconciliation sheet showing the earlier GSTR-2B ARN and the month of actual entry in the purchase register. |
| Reason B: Inadvertent / typographical error in GSTR-3B | Typing error in Table 4A (e.g., swapping CGST and SGST columns or transposition typo). | Detailed calculation showing the arithmetic slip and purchase ledger extract. |
| Reason C: Re-credit of ITC reversed in earlier tax periods | Re-availing credit previously reversed under Rule 37 (supplier paid after 180 days) or Rule 37A (supplier later filed GSTR-3B). | Bank payment proof confirming supplier settlement or 2B reference of supplier's delayed return. |
| Reason D: Import of goods / SEZ inward supplies | ICEGATE bill of entry data delayed or missing from GSTR-2B Table 4(A)(1). | Bill of Entry copies, ICEGATE payment challan (TR6), and custom clearance documents. |
| Reason E: Any other reason (Text box input) | Supplier filed GSTR-1 after 11th/13th cutoff (reflected in GSTR-2A but not GSTR-2B), or IMS Pending invoice accepted late. | Detailed invoice-by-invoice reconciliation sheet, vendor GSTR-1 filing receipts, and tax invoice copies. |
Sample Reply Drafting Template for Reason A (Prior Period ITC)
When drafting your submission under Reason A or Reason E, copy and adapt this legally sound wording:
To: The Proper Officer / GSTN System Administrator
Subject: Reply to Form GST DRC-01C (Part B) for Tax Period [Month/Year], Reference ARN: [Insert ARN]
1. With reference to Intimation in Form GST DRC-01C dated [Insert Date], intimating an ITC difference of ₹[Insert Amount] between GSTR-3B and GSTR-2B, the Registered Taxpayer submits that the credit availed in Table 4(A)(5) is strictly compliant with Section 16 of the CGST Act, 2017.
2. The variance of ₹[Insert Amount] arises because inward supplies pertaining to the tax period [e.g., April to June 2026] were duly reflected in the GSTR-2B of respective earlier months, but physical delivery / accounting verification was completed during the current tax period. Consequently, ITC was legitimately availed in the current GSTR-3B within the statutory time limit prescribed under Section 16(4).
3. The Taxpayer has enclosed an invoice-level reconciliation statement (Annexure-A) mapping each supplier invoice number, supplier GSTIN, tax amount, and corresponding prior GSTR-2B reference.
4. In view of the above substantiated facts, it is respectfully requested that the proceedings initiated under Rule 88D be dropped and no outward return filing restrictions be imposed.
Section 50(3) Interest: Do You Have to Pay 18% on DRC-01C Differences?
A common trap for accountants is calculating interest on the entire difference flagged in DRC-01C. Following the amendment to Section 50(3) of the CGST Act made by the Finance Act 2022 with effect from 1 July 2017 (read with Rule 88B), interest is payable only if the wrongly availed ITC has been BOTH availed AND utilized.
- If you maintained a positive balance in your Electronic Credit Ledger (ECL) equal to or exceeding the disputed ITC amount at all times between the date of filing GSTR-3B and the date of reversal, the credit was never utilized. Under Section 50(3), interest liability is ZERO.
- If your ECL balance dipped below the disputed amount, interest at 18% per annum is payable strictly on the deficit utilized amount from the date of utilization until the date of reversal via DRC-03.
Checklist: Evidence to Attach with Your DRC-01C Reply
Before hitting final EVC/DSC submit on Part B, ensure your attachment includes:
- Detailed Reconciliation Register: Generated client-side using gstr2bmatch.in, showing Invoice Number, Supplier GSTIN, Taxable Value, CGST/SGST/IGST breakdown, and matching status.
- Copies of Sample High-Value Invoices: Demonstrating compliance with Section 16(2) requirements (supplier address, GSTIN, description, tax breakups).
- Proof of Vendor Filing: Screenshots of vendor GSTR-1 filing status from the GST portal search taxpayer utility.
- ICEGATE Bill of Entry Records: If the dispute involves imported raw materials.
Generate Audit-Ready Reconciliation Files in Minutes
Do not scramble through unformatted spreadsheets when a DRC-01C notice arrives. Match your purchase registers against government GSTR-2B sheets in your browser to produce an invoice-level mismatch list you can attach to your reply.
Run Audit Log →Frequently Asked Questions
What happens if I fail to reply to DRC-01C within 7 days?
If Part B is not submitted within 7 days, Rule 59(6)(e) automatically kicks in, disabling your ability to file GSTR-1 or submit invoice data via the Invoice Furnishing Facility (IFF) for subsequent tax periods until the response is completed or payment is made.
Can a GST officer reject my DRC-01C Part B explanation?
Yes. If the jurisdictional officer reviews your submitted reasons and determines the evidence is inadequate or that the credit is legally ineligible, they will issue a formal Show Cause Notice (SCN) under Section 73 or 74 (Section 74A for FY 2024-25 onwards), with a summary in Form DRC-01, to start demand proceedings.
Does GSTR2BMatch store our reconciliation data when we generate a DRC-01C audit sheet?
No. GSTR2BMatch runs completely inside your browser client memory. Your client's financial data, vendor tax IDs, and billing amounts never leave your local computer.
Last checked: 21 October 2026. Menu names on the portal can change, so follow your screen if a label differs. Sources: GSTN advisory on DRC-01C, CGST Rules, rule 59, CGST Act section 50.
Related guides
- IMS pending invoices: why invoices get stuck in IMS Pending and what it costs
- IMS accept, reject or pending: the decision tree and its ITC impact
- supplier not filed GSTR-1: recovering blocked ITC and following up