Income Tax Notice Under Section 143(1): Meaning, Reasons & How to Respond

Last Updated on June 25, 2026

The Income Tax Notices are official letters sent by the Income Tax Department under various clauses laid out by the Income Tax Act 1961. Income Tax Notices could be sent to the taxpayer in matters related to the taxpayer’s return, income filing, assessment, refund, demand, or compliance issues. There could be a variety of reasons for sending the notice, including normal processing of the return, verifying certain aspects, sorting out discrepancies, or investigating specific transactions.

What is Notice Under Section 143(1) of the Income Tax Act 1961?

Notice served under Section 143(1) of the Act can be regarded as an intimation given by the Income Tax Department following receipt and processing of the Income Tax Return (ITR) by the taxpayer. Amongst various kinds of notices, it is one of the most commonly received notices by taxpayers since its purpose is to give an update on the processing status of the ITR.

During this stage, the department examines the details included in the return, which include income declared, deductions claimed, taxes paid, and tax credit allowed. Based on this, the department will either accept the ITR as submitted, conclude that additional tax needs to be paid, or that the taxpayer is eligible for refunds.

Also, the notice may point out any changes resulting from mathematical errors, erroneous claims in the return, and discrepancies in tax data. It should be noted that serving of this type of notice does not necessarily mean scrutiny or investigation, but rather a regular part of the ITR processing process.

Reasons for Notice Under Section 143(1) of Income Tax Act 1961

1. Processing of Income Tax Return: This is the basic reason behind the issuance of a notice, following the process of a taxpayer’s ITR.
2. Arithmetical Errors: Calculation errors in terms of income, deduction, tax amount, or any other figure mentioned in the ITR can be found.
3. Wrong Claim: There may arise a need to change the claims that differ from those mentioned in the ITR or go against tax rules.
4. Misstatement in Tax Credits: Discrepancies between tax credits stated in the ITR and the TDS/TCS certificate may arise.
5. Differences in Income: The amount of income mentioned in the tax return may differ from what has been reported by employers or banks to the government.
6. Excessive Deductions or Exemptions: It is possible that some deductions or exemptions have been revised by the department due to being wrong based on information.
7. Calculation of Amount Due: The department could find that there is more tax, interest, or fees that the taxpayer owes.
8. Determining Eligibility for Refund: Whether a taxpayer will receive a refund depends on what happens during processing.
9. Fixing Obvious Mistakes: The department will correct mistakes found within the information presented in the return.

Time Limit for Issuance of Section 143(1) Notice

A critical fact that taxpayers must know: the Income Tax Department cannot issue a Section 143(1) intimation beyond a specific deadline. Under the law, the intimation under Section 143(1) must be sent within nine months from the end of the financial year in which the return was filed.

For example, if a taxpayer filed their ITR for Assessment Year 2024-25 (i.e., income earned in FY 2023-24) in July 2024, the department must issue any Section 143(1) intimation by 31st December 2025 at the latest.

If no intimation is received within this period, the return is deemed to have been accepted as filed, and no demand or adjustment can be raised under this section thereafter.

This time limit is a statutory protection for taxpayers and should be kept in mind when evaluating the validity of any notice received

Actions to take when Section 143(1) Income Tax Notice is Received

1. Scrutinise the notice to determine if it is showing a refund, keeping the same liability, or showing an increase in the liability of taxes due.
2. Verify your personal information and tax information, which should match the income tax information submitted through your Income Tax Return (ITR), including PAN, assessment year, income, deductions, tax credits, and other information.
3. Cross-check your ITR and notices: Check how the figures mentioned in the notices differ from the figures stated in your original income tax return.
4. Verify your adjustment, which involves checking for changes in income, deductions, exemptions, credit of TDS, interest amounts, and other adjustments.
5. Verify the record of tax credit: Check the correctness of the income and tax credits recorded in Form 26 AS and AIS, among others.
6. Evaluate Your Agreement: In the event that the numbers provided in the notice are correct, hold onto the notice as documentation and settle the tax obligation accordingly.
7. Deal With Errors Immediately: Should the modifications turn out to be wrong, follow the guidelines stated on the income tax website.
8. Maintain Documentation: It would be best to have copies of the notice, the tax form, the payment proof, and other relevant documents for future reference.
9. Professional Help: When there are complicated instructions to follow in the notice, contact a tax expert for assistance.

How to Respond to a Section 143(1) Notice Online: Step-by-Step

Taxpayers can respond to a Section 143(1) intimation entirely through the Income Tax e-filing portal. Here is the process:

Step 1: Log in to the Income Tax Portal

Visit the official income tax website and log in using your PAN as the user ID and your registered password.

Step 2: Navigate to ‘Pending Actions’

From the dashboard, go to Services > Response to Outstanding Demand, or navigate via the e-Proceedings tab if the notice was issued as part of an assessment proceeding.

Step 3: Locate the Intimation

Under the relevant Assessment Year, locate the Section 143(1) intimation. Download the intimation for review if you have not already done so.

Step 4: Choose Your Response

The portal will prompt you to either:

• Agree with the demand and proceed to payment, or
• Disagree with the demand and submit a response explaining the discrepancy with supporting documentation.

Step 5: Pay the Demand (If You Agree)

If the demand is valid, use the ‘Pay Now’ option or pay via Challan 280 on the tax portal under the relevant Assessment Year. Use Minor Head 400 (Tax on Regular Assessment) to ensure correct credit.

Step 6: File a Rectification (If You Disagree)

If the adjustment is incorrect, file a rectification request under Section 154 of the Income Tax Act (covered below). Do not ignore the demand, even if you believe it is wrong; a formal response is required.

Step 7: Confirm Submission

After submitting your response, download and retain the acknowledgement generated by the portal for your records.

Important: The deadline to respond to a Section 143(1) demand is typically 30 days from the date of the intimation. Ignoring the notice beyond this period can result in automatic recovery proceedings.

Timeline for Resolution of Section 143(1) Income Tax Notice

1. Confirmation of Notice of Income Tax Department: After ITR processing, the Income Tax Department will notify the taxpayer using Section 143(1) through their online portal as well as their email address.
2. Quick Evaluation: The taxpayer needs to review the notice carefully and check the amount of income, deductions, tax credit, refund, or tax payable as mentioned in the notice.
3. Assessment of Differences: Analyse the notice based on the data provided by ITR, Form 26 AS, AIS, TIS, and all other documents that have been submitted.
4. If you Agree with the Notification: Pay off the liability as mentioned in the notification in time to avoid any further interest.
5. In Case you disagree with the Notification: Prepare relevant documentation and take remedial action, which may include filing a request for rectification, if needed.
6. Document Everything: It is advisable to retain copies of the notification letter, receipts, documents, and letters sent in relation to the matter.
7. Seek Help from Professionals: Any complicated issue can be examined by a tax expert for appropriate handling of the matter.

Section 143(1) vs Section 143(2): Key Differences

Many taxpayers confuse these two notices, but they are fundamentally different in nature and consequence.

Parameter	Section 143(1)	Section 143(2)
Nature	Automated intimation after processing	Formal scrutiny notice requiring detailed examination
Trigger	Issued to all ITR filers after processing	Issued selectively based on risk assessment
Scope	Covers only arithmetical errors, mismatches, and obvious disallowances	Covers a detailed examination of income, expenses, deductions, and transactions
Department action	Automated by the Centralised Processing Centre (CPC), Bengaluru	Assigned to an Assessing Officer for in-depth review
Response required	Only if there is a demand or you disagree with adjustments	Mandatory detailed response with documentary evidence
Investigation level	Not a scrutiny; no investigation implied	Implies detailed scrutiny of the return
Time limit for issue	Within 9 months of end of the FY in which return was filed	Within 3 months of end of the FY in which the return was filed (for AY 2021-22 onwards)

If you receive a Section 143(2) notice after receiving a Section 143(1) intimation, the matter has escalated to formal scrutiny, and professional representation is strongly advised.

How to Correct Errors in a Section 143(1) Intimation: Rectification Under Section 154

If you believe the Section 143(1) intimation contains an error, such as incorrect TDS credit, wrong income figures, or a disallowance that does not apply to your case, you can file a rectification application under Section 154 of the Income Tax Act.

Who can file: The taxpayer whose return has been processed and who has received an intimation with an incorrect adjustment.

Where to file: Online through the Income Tax e-filing portal under Services > Rectification.

Time limit: A rectification request under Section 154 must be filed within four years from the end of the financial year in which the intimation was issued.

What can be corrected: Rectification is limited to mistakes apparent from the record, meaning the error must be obvious and verifiable from documents already on record (Form 26AS, TDS certificates, AIS, the original ITR). The department cannot use a rectification proceeding to reopen new issues.

Process:

1. Log in to the Income Tax portal.
2. Go to Services > Rectification > New Request.
3. Select the Assessment Year and the return you want to rectify.
4. Choose the type of rectification (Taxpayer Corrected Data, Additional Information, or No further Data Correction Required).
5. Upload supporting documents where applicable.
6. Submit and retain the acknowledgement.

The Assessing Officer or CPC is required to pass an order on the rectification application within six months of receiving it.

Consequences of Non-Compliance

Neglecting a notice served by the Income Tax authorities under Section 143(1) of the Act can result in:

• heavy tax liability,
• penalties on tax dues,
• delay in refund claims, and
• serving of additional notices by the Income Tax department.

In order to avoid problems and ensure immediate settlement of concerns, it is recommended to consult Kanakkupillai, which provides expert opinions regarding tax notices and tax matters in general.

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Conclusion

Any notice issued under the provisions of Section 143(1) of the Act is an important notice that demonstrates the outcome of processing the tax returns by the Income Tax Department. Timely review and proper actions by the taxpayer would prevent any disputes, delays, and liabilities for the taxpayer. Understanding the notice and taking the necessary steps will ensure tax compliance by the taxpayer.

Frequently Asked Questions

1. What is a notice under Section 143(1) of the Income Tax Act 1961?

A notice under Section 143(1) of the Act is the one the Income Tax Department mails out after an Income Tax Return (ITR) is processed. The taxpayer will be told in this notice the result of the processing that includes the computation of tax due, refund payout or amendment of the submitted ITR, acceptance of the ITR.

2. When does a taxpayer receive a Section 143(1) notice?

Article 143(1) The Income Tax Department releases a notice after examining the ITR submitted by the taxpayer and contrasts the data the taxpayer supplies in his ITR with the data it keeps. The notice given to a taxpayer might either be verification for the information submitted or discrepancies in income generated, deductions claimed, tax credits, etc.

3. Is Section 143(1) notice the same as a scrutiny notice?

No, review notice and Section 143(1) notice differ. Section 143(1) notice is an automatic process following ITR processing; the scrutiny notice is mailed after a thorough examination of the ITR submitted by the taxpayer.

4. What should a taxpayer do if he receives a Section 143(1) notice?

He or she should study the document carefully, compare it with the filed return, and ensure that all the changes have been made to it by the Income Tax Department. In case of agreement, there is nothing more needed to do. Discrepancies need to be handled according to the existing guidelines.

5. Can a Section 143(1) notice result in a tax demand or tax refund?

Yes, because after filing the return, the notice will show either extra taxes owed or a refund due, depending on what has been discovered during the analysis.

6. What is the deadline to respond to a Section 143(1) demand notice?

Taxpayers are generally expected to respond within 30 days from the date of the intimation. If you agree with the demand, pay the tax within this period. If you disagree, file a rectification under Section 154 within the same window to avoid interest and recovery action.

7. What happens if I do not respond to a Section 143(1) demand?

If a demand raised under Section 143(1) is not paid or disputed within the stipulated time, the Income Tax Department may initiate recovery proceedings. This can include adjustment of the demand against future refunds under Section 245, attachment of bank accounts, or referral to the Tax Recovery Officer. Interest under Section 220(2) also accrues at 1% per month on the outstanding demand from the due date.