Income Tax Demand Notice 143(1) (2026): How to Respond

TL;DR

An income tax demand notice under Section 143(1) is an automated intimation from the CPC Bengaluru after processing your ITR. It is not a scrutiny notice and not a fraud investigation. It simply means the department found a mismatch between your filed return and their records. You have 30 days to either pay the demand or disagree and request a rectification. Under the Income Tax Act 2025 (effective April 2026), Section 143(1) maps to Section 270.

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If you just opened your email or logged into the income tax portal and found a demand notice under Section 143(1), take a breath. This is one of the most common communications the Income Tax Department sends, and it does not mean you are in trouble. Millions of taxpayers receive this intimation every year, and most cases get resolved quickly.

That said, ignoring it is a mistake. This guide covers everything you need to know: what the notice means, why you got it, how to read the PDF, and exactly how to respond.

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What Is an Intimation Under Section 143(1)?

An intimation under Section 143(1) is the result of your Income Tax Return being processed by the Centralized Processing Centre (CPC) in Bengaluru. After you file your ITR, the CPC's automated system checks it against data from Form 26AS, the Annual Information Statement (AIS), and the Taxpayer Information Summary (TIS). If it finds any discrepancy, it generates this intimation.

The income tax demand notice 143(1) is not a notice in the traditional sense. It is closer to a summary of how the department has processed your return. Think of it as the department saying: "Here is what you reported, here is what we calculated, and here is the difference."

This is purely automated. No Assessing Officer has reviewed your case personally, and receiving this intimation does not mean your case has been selected for scrutiny. Scrutiny happens under a completely different provision, Section 143(2), which requires a separate notice with its own legal procedures.

Section 143(1) Under the New Income Tax Act 2025

An important update that almost no competitor page covers: under the Income Tax Act 2025 (which replaces the 1961 Act from 1 April 2026), Section 143(1) has been renumbered as Section 270. However, all assessments up to AY 2026-27 continue under the old Act. Section 536 of the new Act preserves all pending proceedings, so your current intimation is still governed by the 1961 provisions.

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Three Possible Outcomes of a 143(1) Intimation

Not every 143(1) intimation carries bad news. There are three possible outcomes:

The Section 156 Connection

Here is something most guides skip. When the CPC raises a demand under Section 143(1), that intimation is legally accompanied by a notice of demand under Section 156. This is significant because Section 156 is the formal starting point for recovery proceedings. Once the 30-day response window expires without payment or a valid objection, the department can initiate actions including charging additional interest and, in extreme cases, attaching your bank account.

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Why You Received a Demand: Common Triggers

The most common reason for a 143(1) demand is mundane: a data mismatch between what you reported and what the department's systems show.

TDS/TCS Mismatch

This is the single most frequent trigger. The TDS you claimed in your return does not match the TDS reflected in Form 26AS or AIS. Practitioners on Reddit and tax forums report that this often happens when a taxpayer files their ITR before the deductor uploads the TDS data to the TRACES portal. The CPC processes the return without giving you credit for that TDS, and a demand is raised. This is fixable within days once the data reflects correctly.

Unreported Income Flagged by AIS/TIS

The CPC cross-references your return with data in the AIS, which captures bank interest, mutual fund transactions, property sales, and other financial activity reported by third parties. If the AIS shows income you did not declare in your ITR, expect an adjustment.

Arithmetical Errors

Simple math mistakes in your return. Wrong totals, incorrect addition of income heads, or computation errors in deductions.

Incorrect Deduction Claims

Claiming a deduction you are not eligible for, claiming the same deduction twice, or claiming an amount that exceeds the statutory limit. If you filed your return after the due date, losses from previous years cannot be carried forward, and the CPC will disallow that set-off.

Interest Recomputation

Many taxpayers are surprised to see interest charges in their intimation even though they filed on time. Filing on time and paying the correct tax on time are two different things. The CPC independently calculates interest under Sections 234A, 234B, and 234C, and if their numbers differ from yours, the revised amount shows up in the intimation.

Budget 2025 Cross-Year Consistency Checks

This is new. Budget 2025 strengthened Section 143(1) by enabling the CPC to perform cross-year consistency checks. The system now catches mismatches between your current and prior year returns more effectively. As reporting systems become more interconnected, mismatches are flagged rapidly and trigger more automated adjustments than before.

NRI-Specific Triggers

NRIs face unique issues that rarely get discussed. If you claimed a Foreign Tax Credit but did not file Form 67 (or filed it late), the CPC will deny the credit and raise a demand. DTAA credit mismatches, salary credited in India without corresponding TDS reflecting in 26AS, and incorrect residential status declarations are all common triggers for NRI demands.

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Understanding the Demand Amount

The demand shown in your intimation is not just the tax difference. Here is how it typically breaks down:

Section 234A: Interest for failing to pay the advance tax (or TDS) correctly or on time. Computed at 1% per month. This is charged automatically, even if you filed your ITR on the due date.

Section 234B: Interest for failure to pay advance tax. If your total tax liability (after TDS) exceeds ₹10,000, you were required to pay advance tax. Failure attracts 1% per month.

Section 234C: Interest for deferment of advance tax installments. Even if you paid advance tax, not paying it in the prescribed quarterly installments attracts this interest at 1% per month.

Section 234F: Late filing fee of ₹1,000 or ₹5,000 depending on your income level and how late you filed.

The CPC recomputes all interest independently. If you already accounted for some interest while filing, the difference between your calculation and the CPC's shows up in the intimation.

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What Happens If You Ignore the Demand

Ignoring a 143(1) demand is one of the worst financial decisions you can make. Here is what happens:

• The demand is treated as accepted. Once 30 days pass without a response, the department considers you in agreement.
• Future refunds get adjusted. Any refund due to you in subsequent years will be automatically set off against the outstanding demand. You will not receive any refund until the demand is cleared.
• Interest keeps accruing. Under Section 220(2), interest at 1% per month is charged on the unpaid demand amount from the date the 30-day period expires.
• Recovery proceedings begin. The department can initiate formal recovery, which in serious cases includes attaching your bank account, salary, or other assets.

The bottom line: even if you think the demand is wrong, respond within 30 days. Disagreeing on record protects you while you work on resolution.

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How to Prevent 143(1) Demands

Prevention is straightforward. Most demands arise from avoidable mismatches.

• Match your ITR with Form 26AS, AIS, and TIS before filing. This is the single most effective step. Download all three from the e-filing portal and cross-check every income entry and TDS credit. If there is unreported income in your AIS that you do not declare, a 143(1) demand is almost guaranteed.
• Declare all sources of income. Bank interest, dividend income, capital gains from mutual funds or stocks, rental income. All of it gets reported to the department by third parties. Omitting even small amounts can trigger adjustments.
• Use correct TDS amounts. Copy TDS figures from Form 26AS, not from your salary slip or bank statement. These often differ due to timing of TDS deposits.
• File before the due date. Late filing disqualifies you from carrying forward certain losses and attracts late filing fees.
• Verify your return within 30 days of filing. An unverified return is treated as never filed. No processing, no refund, and potential penalties.

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When to Handle It Yourself vs. When to Call a CA

Simple cases, where the demand is due to a minor TDS mismatch or a small arithmetic error, are straightforward to resolve on your own through the portal.

You should consider professional help if:

• The demand amount is substantial (over ₹25,000)
• You do not understand the basis of the adjustment
• The CPC ignored your 143(1)(a) response and made the adjustment anyway
• You are an NRI dealing with DTAA credits or FEMA implications
• You need to file an appeal before CIT(A)/NFAC
• The demand involves multiple assessment years

A 143(1) intimation is an appealable order under Section 246A. If rectification does not resolve your case, a formal appeal before the Commissioner of Income Tax (Appeals) or the National Faceless Assessment Centre is the next step. This is where having a CA with legal qualifications (covering both tax law and appellate procedures) makes a real difference.

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Frequently Asked Questions

Is a 143(1) intimation the same as a scrutiny notice?

No. A 143(1) intimation is an automated processing summary from the CPC. A scrutiny notice comes under Section 143(2), is issued by an Assessing Officer, and involves a detailed investigation of your return. Receiving a 143(1) intimation does not mean your case is under scrutiny.

What if I did not receive any intimation within 9 months?

If no intimation is issued within nine months from the end of the financial year in which you filed your return, it means no adjustments were made. Your return has been accepted as filed.

Can I appeal against a 143(1) demand?

Yes. The intimation under Section 143(1) constitutes an appealable order under Section 246A of the Income Tax Act. You can appeal before the CIT(A)/NFAC. However, it is advisable to first try rectification under Section 154, as it is faster and less formal.

What is the new section number for 143(1) under the Income Tax Act 2025?

Section 143(1) of the 1961 Act corresponds to Section 270 of the Income Tax Act 2025. The new Act takes effect from 1 April 2026, but all assessments up to AY 2026-27 continue under the old provisions.

What challan should I use to pay a 143(1) demand?

Use Challan 280, selecting Minor Head 400 (Tax on Regular Assessment). Do not select Minor Head 300 (Self-Assessment Tax), which is meant for voluntary payments made before assessment.

I filed a response to the proposed adjustment under 143(1)(a) but the CPC still raised the demand. What now?

This happens more often than it should. File a rectification under Section 154, attaching your original response and supporting documents. If rectification is also rejected without adequate reasoning, escalate through a grievance on the e-filing portal or file a formal appeal.

Does the 143(1) demand include interest automatically?

Yes. The demand amount typically includes interest computed under Sections 234A, 234B, and 234C, in addition to the core tax difference. Even if you already paid some interest while filing, the CPC recalculates it independently.

How do I check the status of my 143(1) demand online?

Log in to the income tax e-filing portal, go to "Pending Actions," then "Response to Outstanding Demand." You will see all pending demands along with their status and response options.