Received a Section 143(1) Intimation? How to Respond to Tax Mismatch Notices

For Assessment Year 2026-27, the first communication you receive from the Income Tax Department after filing your return is the Section 143(1) Intimation. While it looks official and intimidating, it is essentially a "Computerized Receipt" that tells you if the department agrees with your math.

The Centralized Processing Centre (CPC) runs your ITR through an algorithm that matches your claims against Form 26AS/AIS data. If there is even a ₹1 difference in TDS or a small arithmetical error, you will receive an intimation with a dreaded "Demand" in the right-hand column.

1. How to Read Your Intimation

The intimation is divided into two parallel columns:

• Column A: As provided by the Taxpayer in the Return of Income.
• Column B: As computed under section 143(1).

The Color Code:

• Green Dot (No Demand/No Refund): Your math matched. No action needed.
• Blue Dot (Refund Determined): Wait for the credit in your Validated Bank Account.
• Red Dot (Demand Determined): The department thinks you owe them more money. Action is required within 30 days.

2. Common Causes for Mismatch

1. TDS Mismatch: You claimed ₹50,000 TDS, but the Form 26AS only shows ₹45,000. The CPC will automatically disallow the ₹5,000 and create a tax demand.
2. Section 80G Disallowance: You claimed charity deductions, but the NGO didn't file Form 10BD correctly.
3. Arithmetical Errors: Incorrectly calculating interest under Section 234A/B/C.
4. Chapter VI-A Errors: Claiming ₹2 Lakh under Section 80C when the legal limit is ₹1.5 Lakh.

3. How to Respond to a Demand

If you receive a "Demand," do not panic. You have three paths:

Path A: You Agree with the Department

If you made a genuine error (e.g., forgot to report FD interest), simply pay the tax via the portal. The demand will be settled once the payment is linked.

Path B: You Disagree (Data Mismatch)

If the department has missed your TDS or an 80C investment that was actually filed:

1. Go to 'Pending Actions' > 'Response to Outstanding Demand'.
2. Click 'Disagree with Demand' and provide reasons (e.g., TDS not reflected).
3. Upload supporting documents.

Path C: Filing a Rectification (Section 154)

If there is a clear "error apparent from record" (like the same rent being added twice), file a Rectification Request under Section 154 through the portal. Do not file a fresh ITR; use the rectification module to fix the specific error.

Legal Reference: The Processing Mandate

Section 143(1) is the gateway to all tax assessments.

Section 143(1) of the Income Tax Act—Where a return has been made under section 139, such return shall be processed in the following manner, namely:— (a) the total income or loss shall be computed after making adjustments for any arithmetical error in the return or an incorrect claim... If any tax or interest is found due, an intimation shall be sent to the assessee.

Common Mistakes with 143(1) Responses

1. Ignoring the 30-Day Window: If you don't respond within 30 days, the CPC will automatically adjust the demand against any refunds from previous years or initiate bank account attachment for recovery.
2. Filing an Appeal for Simple Errors: Do not file a Form 35 Appeal for arithmetical errors. Rectification is faster and free. Appeals should be reserved for disputes on legal interpretations.
3. Bank Account Not Validated: If your intimation shows a refund but you haven't received it for months, check if your bank account is "Validated and EVC enabled" on the portal.

Conclusion

A Section 143(1) Intimation is a routine health check of your filing. To simplify your response process, always keep your AIS and Form 26AS records ready for comparison.

If your mismatch is related to high-value cash transactions, ensure your explanation aligns with your Cash Audit trail. For deeper scrutiny cases that go beyond automated processing, refer to our guide on Faceless Assessment survival.