Received a GST Notice (DRC 01B) for Mismatch in GSTR-2A/2B and GSTR-3B? Here’s How to Respond

Have you received an intimation (DRC-01B) from the GST department regarding a mismatch between GSTR-2A/2B and your GSTR-3B? Don’t panic! This guide is here to help you do just that. We will break down, why this notice comes, what it means, how to reply to it, and how to avoid this headache in the future.

A Goods and Services Tax (GST) intimation that the Input Tax Credit (ITC) you claimed in Form GSTR-3B does not tally with the auto-populated figures in Form GSTR-2A or its newer static counterpart Form GSTR-2B can feel alarming. Since July 2023, the GST Network (GSTN) has been issuing automated intimation Form DRC-01C under Rule 88D within minutes of detecting significant discrepancies, and from July 2025 onward the compliance screws tighten further with hard-locking of GSTR-3B as well as a 3-year return-filing bar.

Also Read-Income Tax Refund Stuck on ‘Processing’? Here are 5 Reasons and What You Can Do

First, Let’s Understand the Main Issue: What are GSTR-3B and GSTR-2B?

Before you can reply, you need to understand the two main players in this story. The entire problem is a conflict between what you claimed and what your sellers reported.

1. GSTR-3B: Your Monthly Report to the Government Think of GSTR-3B as your monthly summary report. Every month, you file this form to tell the government about your total sales and purchases. Most importantly, in this form, you declare the amount of Input Tax Credit (ITC) you are claiming.

What is ITC? ITC is simply the GST you paid on your business purchases (like raw materials, office supplies, etc.). The government allows you to get this amount back as a credit, which you can use to reduce the tax you have to pay on your sales. GSTR-3B is where you claim this credit.

2. GSTR-2B: The Government’s List of Your Purchases This is the most important document now. GSTR-2B is an automatic list created by the GST portal for you. Whenever your suppliers file their sales returns (GSTR-1), the details of the invoices they issued to you automatically show up in your GSTR-2B. This list is generated on the 14th of every month and does not change after that.

The Golden Rule: The government has made it very clear: You can only claim ITC for those invoices that are visible in your GSTR-2B for that month. If an invoice isn’t on this government list, you cannot claim its credit in your GSTR-3B for that period, even if you have the physical bill. This rule is the main reason these mismatch notices are so common today.

The Problem in Simple Words: You filed your GSTR-3B and claimed a GST credit of ₹10,000. However, the government’s list (your GSTR-2B) only shows a credit of ₹8,000. The GST department is now sending you a notice to ask for an explanation for this ₹2,000 difference.

Understanding the Notice You’ve Received.

The notice you get will most likely be one of these two types:

• DRC-01B: This is an automated, computer-generated notice. It is sent when the difference between your GSTR-3B and GSTR-2B is above a certain limit. It comes to your registered email and mobile number. It is very important to reply to this notice within 7 days.
• ASMT-10: This is a more detailed notice sent by a GST officer who has manually noticed a discrepancy in your returns. You usually get 15 to 30 days to reply to this.

Ignoring a DRC-01B notice is a big mistake. If you don’t reply, the department can directly start recovery proceedings, which may include freezing your bank account or blocking you from filing your next GST return, effectively stopping your business.

What Triggers an ITC Mismatch Notice?

The GST portal now automatically checks every GSTR-3B claim against system-generated GSTR-2B records and sends an electronic alert when the claimed Input Tax Credit (ITC) exceeds prescribed thresholds. The most common notices you may encounter are:

This mismatch doesn’t just appear out of thin air. It happens for specific reasons. Finding the correct reason is the first step to writing a good reply.

1. It’s Your Supplier’s Fault: This is the most common reason.

• Supplier Didn’t File Returns: You bought goods and paid the GST, but your supplier was lazy and didn’t file their GST return (GSTR-1) on time. Because they didn’t report the sale, it never appeared on your GSTR-2B list.
• Supplier Made a Mistake: Your supplier filed their return but made a typing error. For example, they entered the wrong GSTIN (yours!), the wrong invoice number or date, or declared a lower tax amount.

2. It’s Your Fault: We all make mistakes. It’s important to check for our own errors.

• Typing Error by You: You meant to claim a credit of ₹5,000 but accidentally typed ₹50,000 in your GSTR-3B.
• Claimed Credit on a Blocked Item: You claimed GST credit on something the law forbids, like food and beverage bills for employees, or the purchase of a car for personal use.
• Claimed Twice for the Same Bill: You mistakenly entered the same purchase bill twice in your accounting and claimed double the credit.

3. It’s a Simple Timing Issue:

• You received an invoice in March and claimed the credit in your March GSTR-3B. However, the actual goods were delivered to you in April. The rule says you can only claim credit after you receive the goods. So, your claim in March was premature.
• Your supplier issued the invoice in March, but they reported it in their April GST return. As a result, the invoice will appear in your April GSTR-2B, not your March one. This creates a temporary mismatch if you claimed it in March.

Why the GSTN Matches GSTR-2A, 2B and 3B.

Statutory Evolution — Mismatch Rules Through the Years.

1. Pre-2022: Provisional credits (up to 20%, 10%, 5% extra) allowed under different periods; no firm link to 2A.
2. From Jan 2022: ITC available only if supplier declares the invoice in GSTR-1 and it reflects in recipient’s GSTR-2B.
3. Aug 2023: Rule 88D and DRC-01C auto notice for excess ITC claim initiated.
4. From July 2025: GSTR-3B gets ‘hard-locked’—no manual correction, all changes via GSTR-1A before GSTR-3B submission.

Your Step-by-Step Action Plan: How to Respond

Now that you understand the issue, it’s time to act. Just follow these simple steps.

Step 1: Stay Calm and Match Your Records

Before writing any reply, the most important job is to match your accounts.

1. Download the Documents: Go to the GST portal. For the month mentioned in the notice, download these three things:
   • Your filed GSTR-3B
   • Your GSTR-2B (download the Excel file)
   • Your own Purchase Register (from Tally, your notebook, or your own Excel sheet)
2. Create a Comparison Sheet: Open a new Excel sheet. Create columns like: Invoice No., Invoice Date, Supplier’s Name, GSTIN, Value as per your books, Value as per GSTR-2B, Difference, and Remarks/Reason for difference.
3. Check Every Bill: Now, carefully compare each purchase bill from your records with the entries in the GSTR-2B file. This will immediately show you which bills are missing from the government’s list or have a different amount. In the “Remarks” column, write down the reason for each difference (e.g., “Supplier did not file,” “My typing mistake,” etc.).

This comparison sheet is now your most powerful tool.

Step 2: Gather Your Proof

For every mismatch you found, collect the necessary documents as proof.

• If it’s the supplier’s fault:
  • A copy of the tax invoice.
  • Proof of payment (bank statement entry).
  • Proof of receiving the goods (transport receipt, delivery challan).
  • Proof of communication with the supplier (emails, WhatsApp chats where you asked them to fix their return).
• If it’s your fault:
  • The best proof is to accept your mistake. Immediately pay back the extra credit you claimed, along with interest, using Form DRC-03 on the GST portal. Keep a copy of the payment challan.
• If it’s a timing issue:
  • The invoice copy.
  • The delivery receipt that clearly shows the date you received the goods.
  • A screenshot of the next month’s GSTR-2B which shows that the invoice is now appearing.

Step 3: Write a Clear and Simple Reply

Your reply should be polite, to the point, and supported by the proof you have collected.

Simple Format for Your Reply:

1. Reference: Start by clearly writing the Notice Reference Number and Date.
2. Subject: “Reply to Notice for Mismatch in ITC.”
3. Introduction: “Dear Sir/Ma’am, This is in response to the notice we received regarding a mismatch of ₹[Total Difference Amount] for the tax period of [Month, Year]. Our explanation for the same is as follows:”
4. Point-by-Point Explanation: Use your comparison sheet to explain each difference.
   • Example 1 (For Supplier’s Fault):
     

     “A difference of ₹18,000 is due to an invoice (No. 123) from our supplier, XYZ Pvt. Ltd. We have fulfilled all conditions to claim this credit: we have the original bill, we have received the goods, and we have paid the supplier. The mismatch is only because the supplier did not report this sale in their GSTR-1. We have attached the bill and payment proof as evidence (Annexure A & B) and are following up with them.”

   • Example 2 (For Your Fault):
     

     “We acknowledge that we mistakenly claimed an excess credit of ₹10,000. We have corrected this error by paying back this amount along with interest via Form DRC-03 (Challan No. XXXXX). A copy of the payment challan is attached as Annexure C.”

5. List of Proofs: At the end, list all the documents you are attaching. (e.g., Annexure A: Copy of Tax Invoice, etc.).
6. Request: Conclude with a polite request: “Based on the explanations and proofs provided, we kindly request you to consider our case and close the notice proceedings.”

Finally, combine your reply letter and all the proofs into a single PDF file and upload it on the GST portal.

Portal Walk-Through: How to File DRC-01C Part B.

Root-Cause Matrix: Why Do Mismatches Happen and How to Fix?

Financial Impact: Interest, Penalties & Portal Locks.

Worked Example: QRMP Dealer (FY 2024-25).

Since the excess (₹35,000) is more than the 5% threshold (₹5,000), the dealer gets DRC-01C. After reconciliation, ₹25,000 relates to vendor missing GSTR-1; ₹10,000 is self-data error. The dealer pays ₹10,000 + ₹123 interest via DRC-03 and replies to the rest – GSTN accepts, removing the GSTR-1 block.

What’s Changing in July 2025? GSTR-3B Hard-Lock Is Coming.

From July 2025, amendment and correction of outward supply must be made only in GSTR-1A, as GSTR-3B will be locked for editing. Strong reconciliation processes are essential to avoid disruptions and ITC denial.

Legal Defenses You Can Use.

• Genuine Purchaser Protection: Courts have protected purchasers where the supplier defaulted but the invoice and payment were genuine.
• Clerical Correction: Supreme Court has permitted corrections to be allowed beyond normal time limits in select cases.
• CA Certification: For older years (2017–2021), CA certificates can defend your claim if your books match purchases and taxes were paid.

Proactive Steps: Prevent ITC Mismatch Notices in Future.

1. Adopt weekly 2A/2B-to-books matching using automated tools.
2. Evaluate and score vendor compliance monthly; warn or sanction repeat defaulters.
3. Complete all accounting and goods inward entries before the 10th to ensure timely GSTR-2B visibility.
4. Apply internal checks, like dual-approval for 3B submission.
5. Digitally store all support documents to reply quickly if a mismatch notice recurs.
6. Schedule reminders in ERP to avoid missing annual ITC deadlines (Section 16(4)).

Frequently Asked Questions (FAQ).

Q1: What is the very first thing I should do when I get a GST notice?
Don’t panic and don’t ignore it. First, log in to the GST portal to confirm the notice is genuine. Then, immediately start the process of matching your records with your GSTR-2B as explained in this guide.

Q2: What if my supplier is not responding or has shut down his business?
This is tough. As per the law, if the invoice isn’t in GSTR-2B, the credit is not allowed. Your best option is to provide the department with all the proof you have (bill, payment proof, proof of trying to contact the seller). The final decision will be up to the officer. You may have to take separate legal action against the supplier to recover the GST amount you paid him.

Q3: Can I just ignore the notice?
No, never! Ignoring a GST notice, especially DRC-01B, can lead to serious consequences like your bank account being frozen or your GSTR-1 filing being blocked, which can stop your business.

Q4: I made a mistake. How much interest do I have to pay?
If you have used the wrongly claimed credit, you must pay it back with interest at 18% per year. The interest is calculated from the date you wrongly claimed the credit to the date you pay it back.

Conclusion.

Today’s GST regime is unforgiving—automated notices, swift portal blocks, and hard-locked returns mean flawless, ongoing reconciliation is the only defense. Get proactive, leverage technology, maintain vendor discipline, and keep step with every GST Council update to stay ITC-secure!
Golden Rule: If an invoice isn’t in both your GSTR-2B and your records, don’t claim it in GSTR-3B!

Disclaimer:

The information provided in this article is for general informational purposes only. It is not intended as, and should not be considered, professional legal or tax advice. The laws and regulations related to GST are subject to change. We make no representation or warranty of any kind, express or implied, regarding the accuracy, adequacy, validity, reliability, or completeness of any information on this site. For specific advice tailored to your situation, you should consult with a qualified tax professional or chartered accountant.

C.K. Gupta

Hello, I am C.K. Gupta Founder of Taxgst.in, a seasoned finance professional with a Master of Commerce degree and over 20 years of experience in accounting and finance. My extensive career has been dedicated to mastering the intricacies of financial management, tax consultancy, and strategic planning. Throughout my professional journey, I have honed my skills in financial analysis, tax planning, and compliance, ensuring that all practices adhere to the latest financial regulations. My expertise also extends to auditing, where I focus on maintaining accuracy and integrity in financial reporting. I am passionate about using my knowledge to provide insightful and reliable financial advice, helping businesses optimize their financial strategies and achieve their economic goals. At Taxgst.in, I aim to share valuable insights that assist our readers in navigating the complex world of taxes and finance with ease.