ITC Mismatch in GSTR-2B: How to Find and Fix

What is an ITC mismatch?

An ITC mismatch occurs when the input tax credit (ITC) you've claimed in your books (purchase register) doesn't match the ITC auto-populated in your GSTR-2B statement from the GST portal.

Common types of mismatches:

Type	Example	Severity
Tax amount differs	You claimed Rs 1,800 CGST, 2B shows Rs 1,500	Medium — investigate
Invoice number differs	Your books: INV-001, 2B: INV001	Low — usually typo
GSTIN differs	You entered wrong GSTIN	High — wrong vendor
Invoice missing in 2B	In your books, not in 2B	Critical — ITC at risk
Invoice only in 2B	In 2B, not in your books	Medium — booking error

Why ITC mismatches happen

1. Supplier hasn't filed GSTR-1 (most common)

• Cause: Your supplier filed GSTR-1 late or not at all
• Result: Invoice doesn't appear in GSTR-2B
• Impact: ITC at risk — you cannot claim it
• Fix: Chase vendor to file GSTR-1

2. Typo in invoice number

• Cause: You or your supplier entered the invoice number differently
• Example: Your books: INV/2026/001, 2B: INV2026001
• Fix: Fuzzy matching (our tool handles this automatically)

3. Wrong tax amount

• Cause: Rounding off, wrong GST rate, calculation error
• Example: You claimed Rs 1,800, 2B shows Rs 1,750
• Fix: Ask vendor to amend GSTR-1

4. Wrong GSTIN

• Cause: You entered the wrong GSTIN in your books
• Result: Invoice appears under a different vendor in 2B
• Fix: Correct the GSTIN in your books, re-reconcile

5. Wrong invoice date

• Cause: Different billing date in your books vs vendor's GSTR-1
• Impact: Usually minor, but affects cross-period matching
• Fix: Verify with vendor, correct if needed

6. Amendment filed by supplier

• Cause: Supplier filed GSTR-1, then amended it
• Result: Original invoice may disappear from 2B, amended version appears
• Fix: Re-download 2B after amendment

How to find ITC mismatches

Step 1: Reconcile

Use our free GST reconciliation tool to automatically find all mismatches between your books and GSTR-2B.

Step 2: Review the Mismatch tab

The tool shows all mismatches with:

• GSTIN, vendor name, invoice number
• Books tax amount vs 2B tax amount
• Difference (positive or negative)

Step 3: Categorize mismatches

• Small difference (< Rs 10): Rounding — usually safe to ignore
• Large difference (> Rs 100): Wrong rate or wrong invoice — investigate
• Invoice missing in 2B: ITC at risk — chase vendor
• Invoice only in 2B: Booking error — book it

How to fix ITC mismatches

Fix 1: Contact the vendor

For tax amount mismatches:

1. Send the vendor a screenshot of the mismatch
2. Ask them to check their GSTR-1 filing
3. If they made an error, ask them to file an amendment

Fix 2: Correct your books

For invoice number or GSTIN errors:

1. Correct the invoice number in your accounting software
2. Correct the GSTIN if wrong
3. Re-export your purchase register
4. Re-run the reconciliation

Fix 3: Reverse the ITC

If the vendor won't file or the mismatch can't be resolved:

1. Reverse the ITC in your next GSTR-3B
2. Add the reversed amount to Table 4(B)(1) of GSTR-3B
3. Pay the tax + interest if applicable

Fix 4: Re-claim later

If the vendor files after you reversed:

1. The invoice will appear in a future GSTR-2B
2. You can re-claim the ITC in that month's GSTR-3B

Section 16(2)(aa) and ITC eligibility

Section 16(2)(aa) of the CGST Act (inserted by Finance Act 2022, effective from January 1, 2022) states:

ITC is only eligible if the invoice or debit note has been furnished by the supplier in their GSTR-1 and appears in GSTR-2B.

What this means:

• If an invoice is NOT in GSTR-2B, you cannot claim ITC on it — even if it's genuine
• Since April 1, 2026, the portal blocks your GSTR-3B if you try
• You must reconcile and ensure all claimed ITC is in 2B

DRC-01C notices for ITC mismatch

DRC-01C is a show-cause notice issued by the tax department when:

• Your claimed ITC exceeds the ITC in GSTR-2B
• The department detects the mismatch through ASMT-10 or data analytics

What to do if you receive DRC-01C:

1. Don't panic — it's a show-cause notice, not a demand
2. Reconcile immediately using our tool
3. Reverse the excess ITC in your next GSTR-3B
4. Reply to the notice with your reconciliation report
5. Pay interest if applicable (18% per annum)

How to avoid DRC-01C:

• Reconcile every month before filing GSTR-3B
• Never claim ITC that's not in GSTR-2B
• Reverse ITC promptly if vendor doesn't file

How to track ITC reversals

Type	When	Where in GSTR-3B
Rule 37A reversal	180 days passed without payment	Table 4(B)(1)
Vendor didn't file	ITC at risk, not in 2B	Table 4(B)(1)
Excess ITC claimed	Mismatch detected	Table 4(B)(1)
Re-claim after vendor files	Invoice appears in future 2B	Table 4(A)

Find ITC mismatches in seconds with our free reconciliation tool.

**ITC Mismatch = Books ITC - GSTR-2B ITC**

**Types:**
1. Tax amount differs (rounding, wrong rate)
2. Invoice number differs (typo)
3. GSTIN differs (wrong vendor)
4. Invoice missing in 2B (vendor didn't file) -> ITC at risk
5. Invoice only in 2B (booking error)

**Section 16(2)(aa):** ITC eligible only if in GSTR-2B
**DRC-01C:** Show-cause notice for ITC exceeding 2B
**Reversal:** Table 4(B)(1) of GSTR-3B