Before you respond to DRC-01C
First identify what created the difference. A mismatch can arise from timing, reversals, reclaims, import IGST, RCM treatment, amendments, credit notes or a genuine excess claim.
Download the DRC-01C Part A and prepare a period-wise reconciliation before selecting a response. GSTN's official manual states that Part A displays the intimation and Part B is used to provide the taxpayer's response.
1. What is GST DRC-01C?
DRC-01C is an automated ITC mismatch intimation generated by the GST system when the system detects a material difference between ITC available in the relevant auto-generated data and ITC claimed in GSTR-3B/3BQ beyond the configured criteria.
GSTN's functionality note explains that the system compares the relevant ITC figures for each return period and can generate DRC-01C where the difference crosses the configured threshold.
What happens after receiving it?
- Part A shows the system-generated mismatch/intimation.
- You must examine the underlying GSTR-2B/GSTR-3B figures and your books.
- Part B allows you to respond by providing a DRC-03 payment reference, an explanation for the difference, or both.
- If the previous DRC-01C response is not filed, GSTN states that subsequent GSTR-1/IFF filing can be blocked.
2. Why can the ITC mismatch happen?
Supplier timing
Invoice belongs to your books, but supplier reported it in a later period. The purchase register and the system-generated statement can therefore fall into different periods.
Previous-period ITC
Eligible ITC from an earlier period may have been claimed in the current GSTR-3B. Your ledger and invoice ageing should prove the timing.
ITC reversal
Rule-based or business-specific reversals may create movement between eligible ITC and reversal tables. Do not compare only one gross number.
Reclaim
ITC reversed earlier and reclaimed later can create a difference if your reconciliation does not track the reversal/reclaim chain.
Import IGST
Import goods ITC has a separate data trail involving Bill of Entry/ICEGATE. Reconcile imports separately rather than forcing them into supplier invoice matching.
RCM
RCM ITC follows a different liability/payment trail. GSTN has also made changes to how RCM is considered in the DRC-01C computation.
Credit notes/amendments
Original invoices, credit notes and amendments can change net ITC. GSTR-2B itself presents net effects in relevant ITC tables.
Genuine excess claim
The reconciliation may ultimately show that ITC was actually claimed in excess. In that case, correction/payment may be required rather than an explanation based on timing.
3. A 15-minute diagnostic workflow
| Step | What to check | Output |
|---|---|---|
| 1 | Download DRC-01C Part A | System mismatch amount |
| 2 | Download GSTR-2B for the relevant period | Available ITC working |
| 3 | Open filed GSTR-3B | Actual ITC claimed |
| 4 | Compare purchase register | Book-side invoice population |
| 5 | Check previous-period claims | Timing difference |
| 6 | Check reversals/reclaims | Net movement |
| 7 | Check import/RCM/ISD separately | Special-category adjustments |
| 8 | Classify every rupee of the difference | Explanation or payment |
GSTN advises taxpayers to reconcile GSTR-2B with their own records and books and ensure that credit is not availed twice and that required reversals are made.
4. How to file DRC-01C Part B on the GST portal
The official GSTN procedure is:
- Login to gst.gov.in.
- Go to Services → Returns → Return Compliance, or use the Return Compliance link on the dashboard.
- In the ITC Mismatch (DRC-01C) tile, click VIEW.
- Open the pending DRC-01C using the reference number, return period or status search.
- Open the relevant reference number.
- Review Part A and the mismatch amount.
- In Part B, choose the appropriate response path: provide a DRC-03 ARN, provide the reason/explanation, or provide both.
- Save the response.
- Select the declaration, authorised signatory and place.
- Click FILE GST DRC-01C.
GSTN's manual confirms that Part B has a payment-reference section and a reason-for-difference section, and that DRC-03 can be opened from the DRC-01C screen where payment is required.
5. What reason should I select in Part B?
GSTN provides reason options and allows an explanation where the listed reason does not fully describe the difference. GSTN's FAQ says there are four listed reason options, with an “other reasons” route and a limited explanation field.
| Actual situation | Practical response approach |
|---|---|
| Timing difference | Explain the period difference and retain invoice/2B/return reconciliation. |
| Reversal already made | Show where and when the reversal was reported and reconcile the amount. |
| Reclaim after earlier reversal | Show the original reversal and later eligible reclaim as one audit trail. |
| Import IGST | Reconcile with Bill of Entry/ICEGATE records and the relevant GSTR-3B reporting. |
| RCM | Reconcile tax paid under RCM and corresponding ITC separately. |
| Credit note/amendment | Link original invoice, amendment/credit note and net ITC impact. |
| Genuine excess ITC | Quantify the excess and consider DRC-03/payment or correction required under the facts. |
| Other genuine reason | Select the applicable “other” route and explain the specific reconciliation in the permitted field. |
6. Practical mismatch situations — what should you do?
Case 1 — Supplier filed the invoice late
Situation: Purchase register records the invoice in April, but supplier's filing causes it to appear in a later GSTR-2B.
Action: Trace the invoice number, supplier GSTIN and filing period. Do not treat a timing difference as an unexplained permanent excess. Document when the invoice became visible and when ITC was actually claimed.
Case 2 — You claimed an earlier-period eligible invoice in the current month
Situation: The current GSTR-3B contains eligible ITC that was not claimed in the original period.
Action: Maintain a “previous-period ITC claimed” schedule. The schedule should show invoice, original 2B period, claim period, tax amount and eligibility.
Case 3 — ITC was reversed earlier and reclaimed later
Action: Do not count the reclaim as a completely new invoice population. Link the reversal and reclaim. GSTN's GSTR-3B guidance states that reclaimable reversals reported in 4(B)(2) can subsequently be reclaimed in 4(A)(5), with the reclaim disclosed in 4(D)(1).
Case 4 — Rule 37A movement
Action: Maintain a Rule 37A tracker showing supplier invoice, original claim, reversal, supplier filing status and later reclaim. This prevents the same ITC from being treated as both an unexplained excess and a valid reclaim.
Case 5 — Import IGST is the difference
Action: Reconcile Bill of Entry-wise. Keep BOE number/date, port, taxable value, IGST, ICEGATE/GSTR-2B appearance and GSTR-3B claim in one schedule. GSTR-2B includes import information received from ICEGATE.
Case 6 — RCM ITC is involved
Action: Reconcile the RCM liability and ITC separately. GSTN's functionality note specifically records that ITC on RCM supplies in 4A(3) was excluded from the DRC-01C mismatch computation when the enhancement was introduced.
Case 7 — Credit note reduced ITC
Action: Match the credit note/amendment to the original invoice and calculate the net effect. Do not compare gross invoice ITC with net GSTR-2B ITC.
Case 8 — Genuine excess ITC was actually claimed
Case 9 — Your books agree but portal figures look different
Action: Download the underlying GSTR-2B and compare document-level data. Check amendments, credit notes, negative values, ISD, imports and supplier filing timing before concluding that the portal is wrong.
Case 10 — Previous DRC-01C was ignored
7. Worked example — reconcile before responding
Assume the system indicates a mismatch of ₹3,50,000. Do not immediately pay ₹3,50,000.
| Component identified | Amount | Conclusion |
|---|---|---|
| Previous-period eligible ITC claimed now | ₹1,20,000 | Timing difference — support with tracker |
| Import IGST supported by BOE | ₹80,000 | Special-category reconciliation |
| RCM-related movement | ₹60,000 | Reconcile separately |
| Eligible reclaim after documented reversal | ₹50,000 | Link reversal and reclaim |
| Actual unexplained/excess claim | ₹40,000 | Evaluate correction/payment |
| Total difference explained | ₹3,50,000 | Fully classified |
The lesson is simple: DRC-01C response should be driven by a reconciliation, not by the amount displayed on the screen.
8. When should DRC-03 be used?
Use the payment route when your reconciliation shows that an amount is genuinely payable or when the facts require voluntary payment of the discrepancy. GSTN's DRC-03 manual includes “Mismatch between FORM GSTR-2B and FORM GSTR-3B” as a cause of payment.
In DRC-01C Part B, GSTN allows the taxpayer to enter and validate the DRC-03 ARN. It is not mandatory to enter an ARN if the taxpayer is responding through the explanation route instead.
9. Common mistakes while responding
- Paying the entire mismatch without reconciliation.
- Assuming every difference is a supplier mismatch.
- Ignoring previous-period ITC.
- Ignoring reversals and reclaims.
- Combining import IGST with normal supplier invoices.
- Using RCM ITC as an unexplained difference.
- Giving a vague explanation without an amount-wise working.
- Selecting a reason but leaving the explanation field incomplete where the portal requires explanation.
- Forgetting to file Part B after saving the response.
- Ignoring the alert until the next GSTR-1/IFF filing is blocked.
10. Monthly control system to prevent DRC-01C surprises
| Control | Frequency | Responsible team |
|---|---|---|
| Purchase register vs GSTR-2B | Monthly | Accounts/AP |
| 2B vs GSTR-3B ITC bridge | Before filing | GST team |
| Previous-period ITC tracker | Monthly | GST team |
| Reversal/reclaim tracker | Monthly | Tax + accounts |
| Import BOE reconciliation | Monthly | Import/GST team |
| RCM reconciliation | Monthly | Tax team |
| DRC-01C pending check | Every return cycle | Tax manager |
GSTN itself advises reconciliation of GSTR-2B with books and records and stresses avoiding duplicate credit and making required reversals.
11. Final DRC-01C response checklist
- ☐ DRC-01C Part A downloaded and reviewed.
- ☐ GSTR-2B for the relevant period downloaded.
- ☐ Filed GSTR-3B verified.
- ☐ Purchase register reconciled.
- ☐ Previous-period ITC checked.
- ☐ Reversals and reclaims checked.
- ☐ Import IGST separately reconciled.
- ☐ RCM separately reconciled.
- ☐ Credit notes/amendments checked.
- ☐ Every rupee of the difference classified.
- ☐ DRC-03 payment made only where actually required.
- ☐ Correct Part B reason selected.
- ☐ Explanation entered where required.
- ☐ Declaration, authorised signatory and place completed.
- ☐ DRC-01C Part B successfully filed.
- ☐ ARN/acknowledgement and reconciliation working saved in the GST file.
12. Frequently asked questions
Does receiving DRC-01C automatically mean I have wrongly claimed ITC?
No. It is an automated mismatch intimation. First reconcile the difference and identify its cause.
Can I explain the difference instead of paying?
Yes, where the difference is genuinely explainable and supported. GSTN's Part B allows a reason/explanation response.
Do I have to file DRC-03 for every DRC-01C?
No. GSTN's manual states that Part B can be filed with the explanation route, the DRC-03 ARN route, or both.
What if only part of the difference is actually payable?
Classify the full difference first. Pay the amount that is actually payable and explain the balance with supporting reconciliation.
Can previous-period ITC create the difference?
Yes. Timing differences should be separately tracked and supported rather than mixed with current-period supplier mismatches.
Can import IGST be part of the reconciliation?
Yes. GSTR-2B includes import information received from ICEGATE, so imports should be reconciled separately.
Can RCM ITC create confusion?
Yes. RCM has a separate liability/payment trail, and GSTN's DRC-01C functionality has specific treatment for RCM in its computation.
What happens if I do not respond?
GSTN states that if the response for the previous DRC-01C is not filed, subsequent GSTR-1/IFF filing can be restricted.
Can I correct a filed GSTR-3B later?
GSTRN's GSTR-3B manual states that amendment of a filed GSTR-3B is not allowed. Therefore, investigate the mismatch carefully before filing the original return.
Should I blindly follow the auto-populated GSTR-3B values?
No. GSTN states that system-generated values are for assistance and are editable; the taxpayer remains responsible for the correctness of the filed return.
How should I maintain evidence?
Keep the DRC-01C Part A, GSTR-2B, filed GSTR-3B, purchase register, reversal/reclaim tracker, import/RCM workings and the final Part B response/ARN together.
What is the safest approach?
Reconcile → classify → decide → respond → preserve evidence. Do not work backwards from the portal's mismatch amount.
Final takeaway — respond like a GST reviewer
A strong DRC-01C response is not simply an explanation typed into the portal. It is a traceable reconciliation that explains every material difference.
Understand what the system flagged
2B, 3B, books and special categories
Timing, reversal, reclaim or excess
Explanation, DRC-03 or both
File Part B correctly
Preserve the complete audit trail
If another accountant can open the file later and reproduce the DRC-01C response from the underlying returns, ledgers, invoices and reconciliation, the compliance process is professionally controlled.
A practical next step
If your organisation receives DRC-01C notices regularly, create a permanent 2B → 3B ITC bridge before every return filing. Track timing differences, reversals, reclaims, imports and RCM separately. That converts DRC-01C from a surprise notice into a control report.
Source note
This article's portal procedure and DRC-01C functionality are based on official GSTN guidance, including the GST Portal Return Compliance manual, GSTN DRC-01C FAQ and GSTN guidance for GSTR-2B/GSTR-3B/DRC-03. Portal labels and functionality can change; users should follow the interface and instructions applicable to the relevant tax period.