Section 143(1) Intimation from CPC — How to Read It, Why Your Refund Changed, and How to File a Rectification

You filed your ITR, claimed a refund of Rs 18,500, and waited. A few weeks later, an intimation arrives from the Centralized Processing Centre (CPC) — but instead of Rs 18,500, it says your refund is Rs 7,200. Or worse, it shows a tax demand of Rs 4,000 that you need to pay.

This is a Section 143(1) intimation, and it's one of the most common communications from the Income Tax Department. Every return processed by the CPC generates one. Understanding what it says — and knowing what to do when the numbers don't match — can save you from paying tax you don't owe, or from ignoring a legitimate shortfall that attracts interest.

What Is a Section 143(1) Intimation?

After you file your ITR, the CPC at Bengaluru processes it through an automated system. It checks for arithmetical errors, verifies your tax, TDS, and TCS figures against Form 26AS and AIS, applies the correct tax rates, and adjusts any disallowed deductions.

The result is communicated as an intimation under Section 143(1). It's not a detailed scrutiny — no officer has reviewed your documents. It's a computer-generated comparison between what you reported and what the department's data shows.

The CPC must issue this intimation within nine months from the end of the financial year in which the return was filed. For AY 2026-27 returns, this means by December 31, 2027.

Three Possible Outcomes

Every 143(1) intimation falls into one of three categories:

No demand, no refund (nil adjustment): Your computation matches the CPC's computation exactly. The intimation confirms this and no further action is needed.

Refund determined: The CPC agrees that you've paid more tax than your liability, and a refund is due. The refund amount may match what you claimed, or it may differ.

Tax demand raised: The CPC's computation shows that you owe additional tax. This could be because of disallowed deductions, TDS mismatches, or interest charges that your original return didn't account for.

How to Read the Intimation

The 143(1) intimation is structured as a side-by-side comparison. The left column shows the figures as computed by you in your ITR, and the right column shows the figures as computed by the CPC. Here's what each major section contains:

Income Details

This section lists your gross total income under each head — salary, house property, capital gains, other sources. If there's a discrepancy here, it usually means the CPC has included income that you didn't report, based on information from your AIS or Form 26AS.

Deductions

All deductions you claimed under Chapter VI-A (80C, 80D, 80E, etc.) appear here. The CPC may disallow a deduction if you've opted for the new tax regime but still claimed old-regime deductions, or if the claimed amount exceeds the statutory limit.

Tax Computation

This shows the tax calculated on your total income, any rebate under Section 87A, surcharge if applicable, health and education cess, and the final tax payable.

Tax Credits

Here the CPC lists TDS (from Form 26AS), TCS, advance tax, and self-assessment tax. Mismatches here are the single most common reason for refund differences.

Interest Under Sections 234A, 234B, and 234C

If you filed late or didn't pay adequate advance tax, the CPC will calculate and levy interest. This is mandatory — even if you forgot to include it in your self-assessment computation, the CPC will add it.

Net Result

The final row shows the net tax payable or refundable after adjusting all credits and interest.

Common Reasons Your Refund Is Lower Than Expected

1. TDS Mismatch

This is by far the most frequent cause. You claimed Rs 85,000 of TDS in your ITR, but Form 26AS shows only Rs 72,000. The CPC grants credit only for TDS that appears in its records.

Why it happens: Your employer or bank may have deducted TDS but not yet deposited it with the government, or filed the TDS return late. Sometimes the PAN is entered incorrectly in the TDS statement.

What to do: Download your Form 26AS and AIS and compare them with your Form 16/16A. If the deductor hasn't filed their TDS return, ask them to do so. Once the TDS reflects in 26AS, you can file a rectification.

2. Deduction Disallowed Under the New Tax Regime

You opted for the new tax regime under Section 115BAC but claimed deductions like 80C, 80D, or HRA exemption. The CPC will disallow these because the new regime doesn't permit most deductions.

Example: Rajesh filed under the new regime and claimed Rs 1,50,000 under Section 80C and Rs 25,000 under Section 80D. The CPC disallowed both, increasing his taxable income by Rs 1,75,000 — resulting in an additional tax demand instead of the expected refund.

3. Interest Charged Under 234A/234B/234C

If you filed after July 31 (Section 234A), didn't pay advance tax when required (Section 234B), or underpaid an advance tax instalment (Section 234C), the CPC will compute and levy interest at 1% per month. Many taxpayers forget to include this interest in their self-assessment tax payment, so the CPC adjusts it from the refund.

4. Income Not Reported

The CPC cross-references your return against data from banks, mutual fund registrars, and other financial institutions via the AIS. If you earned Rs 45,000 in FD interest but didn't report it in your ITR, the CPC may add it to your income.

5. Arithmetical Errors

Simple calculation mistakes — adding deductions incorrectly, applying the wrong tax rate, or miscalculating cess — get corrected automatically. While less common if you used filing software, manual errors in offline utilities still occur.

6. Mismatch in Exempt Income Reporting

Sometimes long-term capital gains reported as exempt (under Section 54 or 54F) are not recognized by the automated system because the corresponding reinvestment details weren't properly filled in the schedules. The CPC may tax the gains that you claimed as exempt.

What to Do When You Receive the Intimation

Step 1: Don't Panic

A 143(1) intimation is routine — it doesn't mean you're being investigated. Every processed return gets one.

Step 2: Compare Line by Line

Open the intimation alongside your filed ITR. Go through each row and identify exactly where the CPC's computation differs from yours. Note down every discrepancy.

Step 3: Check if the CPC Is Right

In many cases, the CPC is correct. If you genuinely forgot to report some interest income, or you claimed a deduction under the wrong regime, the adjustment is legitimate. In that case:

• If there's a reduced refund, no action is needed — the reduced amount will be credited to your bank account
• If there's a tax demand, pay it through e-Pay Tax on the income tax portal using challan code 400 (tax on regular assessment)

Step 4: Respond to the Demand Online

For any tax demand, log in to the income tax portal, go to Pending Actions → Response to Outstanding Demand, and either:

• Agree with the demand (if the CPC is correct) and pay it
• Partially agree if some adjustments are correct but others aren't
• Disagree if you believe the CPC's computation is wrong

You must respond within 30 days, or the demand becomes confirmed.

How to File a Rectification Under Section 154

If you disagree with the 143(1) intimation and believe the CPC has made an error, you can file a rectification request under Section 154. This is an online process:

1. Log in to the income tax e-filing portal
2. Go to Services → Rectification
3. Select the assessment year (e.g., 2026-27)
4. Choose the rectification request type:
   • Tax credit mismatch: If the TDS/TCS amounts are wrong
   • Reprocessing of return: If you want the CPC to reprocess your return after corrected TDS statements are filed
   • Taxpayer correcting data in the filed return: If you need to correct a mistake in your original return (note: for substantive changes, a revised return is more appropriate)
5. Provide details supporting your request
6. Submit with e-verification (Aadhaar OTP, DSC, or EVC)

Important Points About Rectification

• You can file a rectification only after the 143(1) intimation is generated — not before
• The time limit is four years from the end of the financial year in which the order was passed
• Multiple rectification requests are allowed for the same assessment year
• A rectification can only correct "mistakes apparent from the record" — not introduce new claims that require fresh adjudication

When a Revised Return Is Better Than Rectification

If the issue with your 143(1) intimation stems from a mistake in your original return — such as forgetting to report an income source, claiming a wrong deduction, or selecting the wrong tax regime — filing a rectification alone won't help. You need to file a revised return under Section 139(5) first, and then the CPC will reprocess your corrected return.

The revised return must be filed before December 31 of the assessment year (i.e., December 31, 2026, for AY 2026-27) or before the assessment is completed, whichever is earlier.

How to Check Your Intimation Online

If you haven't received the intimation by email, log in to the income tax portal and go to e-File → Income Tax Returns → View Filed Returns. Select the assessment year, click on the acknowledgement number, and if processed, you'll see Intimation u/s 143(1) available for download.

A Practical Example

Scenario: Priya, a salaried professional, filed ITR-1 for AY 2026-27 claiming:

What happened: Two mismatches — Priya didn't report Rs 32,000 of FD interest from a second bank account (visible in her AIS), and Rs 5,000 of TDS from one employer hadn't yet reflected in Form 26AS because the employer filed the TDS return late.

Resolution: Priya contacted her employer, who filed the corrected TDS return. After verifying that the FD interest was genuinely hers (not a data error in AIS), she filed a revised return adding the missing interest income, and then filed a rectification request for TDS reprocessing. The CPC reprocessed her return, and she received a corrected intimation with a refund of Rs 7,760.

Avoiding 143(1) Mismatches in the First Place

The best way to avoid surprises is to cross-verify before you file:

• Download your AIS before starting your ITR and ensure all income sources are reported
• Match TDS entries in your Form 16/16A with Form 26AS — report only what's reflected there
• Double-check your regime choice and ensure deductions match what's allowed under that regime
• Include interest under 234A/B/C in your self-assessment tax if applicable
• Submit AIS feedback for any transactions that don't belong to you — do this before filing your return

49Tax's AI-powered filing automatically cross-references your AIS, Form 26AS, and Form 16 to flag discrepancies before you submit — so 143(1) surprises become rare.

Key Takeaway

A 143(1) intimation is not a penalty notice — it's the CPC telling you the result of its automated check on your return. When the numbers don't match, the fix is usually straightforward: verify the discrepancy, correct the underlying issue (whether it's a TDS mismatch, unreported income, or wrong regime selection), and file a rectification or revised return as needed. Act within 30 days on any demand, and always keep your AIS and Form 26AS reconciled before filing to minimize surprises.