Section 143(1) Intimation: 30-Day Response Window For Mismatch Adjustments And Rectification

If you filed your income tax return and then received an email from CPC Bengaluru with the subject line "Intimation under Section 143(1)", you are not being scrutinised — your return has simply been processed by the Centralised Processing Centre, and the system has reconciled what you reported against what it holds on record. The catch is the clock: you have 30 days from the date of receipt to respond on the e-filing portal under the e-Proceedings tab before any proposed adjustment becomes final. This guide walks through what the intimation means, the exact statutory route to contest it, and a worked example of a salaried taxpayer turning a Rs 6,900 demand into a nil position.

For salaried filers in FY 2025-26, the most common trigger is a TDS or refund mismatch — and the fix is procedural, not adversarial, provided you act inside the window.

The Scenario

Picture Rohan, a salaried professional with a gross salary of Rs 14,00,000 for FY 2025-26, filing under the new tax regime. After the standard deduction of Rs 75,000, his taxable income is Rs 13,25,000. His employer's Form 16 shows TDS of Rs 81,900 deducted across the year, and that is exactly what he claimed in his ITR. He expected a nil balance.

Three weeks after filing, the Section 143(1) intimation arrives. The two-column table — "As provided by taxpayer in Return of Income" versus "As computed under Section 143(1)" — shows his self-assessed tax matching, but his TDS credit has been restricted to Rs 75,000, not the Rs 81,900 he claimed. The difference of Rs 6,900 now appears as a net demand payable. The reason: his employer deposited the Q4 TDS late, so by the time CPC processed the return on the e-filing portal, only Rs 75,000 was reflected in Form 26AS and the Annual Information Statement (AIS).

This is the textbook 143(1) situation. Nothing is wrong with Rohan's return; the mismatch is a timing gap between his Form 16 and the tax credit database. As we explained in our guide on Form 26AS vs AIS vs TIS reconciliation, these databases are the single source of truth CPC uses, and a credit that has not landed there yet simply does not exist for processing purposes.

Statutory Answer

A Section 143(1) intimation is issued after CPC Bengaluru processes the ITR. It flags arithmetic errors, disallowances and prima facie adjustments — and nothing more. The processing is automated under Section 143(1) of the Income-tax Act 1961, and the permitted adjustments are confined to six narrow categories listed in clauses (i) to (vi): arithmetical errors, incorrect claims apparent from the return, disallowance of losses or expenditure, and mismatches in tax credits or income reported in Form 26AS and the AIS (per the Income-tax Act 1961 on India Code).

The taxpayer has 30 days from receipt to respond on the e-filing portal under the e-Proceedings tab. You can mark each proposed adjustment "Agree" or "Disagree", and where you disagree you must attach a supporting reason or document. If you do nothing within 30 days, the adjustment is deemed accepted and the demand or reduced refund is finalised. The response workflow is handled entirely online through the Income Tax e-Filing portal — there is no physical correspondence with an officer at this stage.

Two further statutory routes matter once the 30-day window is in play:

A demand under 143(1) becomes appealable to the Commissioner (Appeals), or CIT(A), under Section 246A — confirmed by the statutory list of appealable orders (Section 246A on Indian Kanoon). But for an apparent error like Rohan's, the cleaner path is rectification: Section 154 allows correction of any mistake apparent from the record, and both the taxpayer and CPC can act suo moto within 4 years from the end of the financial year in which the order was passed. A refund finally determined under 143(1) is credited only to a pre-validated bank account, so account validation is a prerequisite, not an afterthought.

Worked Resolution

Here is how Rohan's numbers resolve, step by step, using the FY 2025-26 new regime slabs. You can replicate the liability side using the Oquilia income tax calculator and cross-check the credit side with the TDS calculator.

Step 1 — Confirm the tax liability is correct. On taxable income of Rs 13,25,000 under the new regime:

His income of Rs 13,25,000 exceeds the Rs 12,00,000 threshold, so the Section 87A rebate (up to Rs 60,000 in the new regime for FY 2025-26) does not apply. The liability of Rs 81,900 in both the return and the intimation matches — so the liability side is not the problem.

Step 2 — Locate the mismatch. The intimation restricts TDS credit to Rs 75,000 (what Form 26AS showed on the processing date) against the Rs 81,900 claimed. Demand = Rs 81,900 minus Rs 75,000 = Rs 6,900.

Step 3 — Verify the missing credit is genuine. Rohan downloads the updated Form 26AS and finds his employer has now filed the Q4 TDS correction; the full Rs 81,900 is reflected. The credit was always real — it was simply not in the database when CPC processed the return.

Step 4 — Choose the route. Because the only error is a tax credit apparent from the record that CPC could not see at processing time, this is a classic Section 154 rectification. Rohan logs in to the e-filing portal, selects "Rectification" against the relevant assessment year, picks the "Tax Credit Mismatch Correction" request type, and submits. CPC re-processes against the updated Form 26AS.

Step 5 — Outcome. With the full Rs 81,900 credit restored, liability of Rs 81,900 equals credit of Rs 81,900: the Rs 6,900 demand collapses to nil. No interest under Section 220(2) accrues because the demand is resolved within the window rather than left unpaid past 30 days. Had Rohan instead claimed a credit that genuinely did not exist, the demand would have stood and he would have needed to pay it or pursue the late-deposit recovery with his employer separately.

The lesson for any regime: your tax liability and your tax credit are two independent ledgers, and a 143(1) intimation almost always disputes the credit ledger, not the liability. If you are still weighing which regime minimises liability in the first place, the old vs new regime calculator is the place to start before you file. And if the mismatch is genuinely your error, our explainer on the Section 139(8A) updated return (ITR-U) covers the 24-month window to set it right with additional tax.

FAQ

Is a Section 143(1) intimation the same as a scrutiny notice under Section 143(2)?

No. A Section 143(1) intimation is an automated, computer-generated processing summary from CPC Bengaluru that adjusts only arithmetic errors and prima facie mismatches in the six categories permitted by law. A Section 143(2) notice opens a detailed scrutiny assessment where an Assessing Officer examines your return in depth. The 143(1) intimation carries the 30-day response window on the e-filing portal; scrutiny under 143(2) is a separate, document-heavy process with its own timelines.

What happens if I miss the 30-day response window?

If you do not respond within 30 days of receipt, the proposed adjustment is treated as accepted and the resulting demand or reduced refund is finalised. You can still file a Section 154 rectification within 4 years for an apparent mistake, or appeal the demand to the CIT(A) under Section 246A within 30 days of service, but responding inside the original 30-day window on the e-Proceedings tab is the simplest and cheapest route.

Can I appeal a demand raised under Section 143(1)?

Yes. A demand determined under Section 143(1) is an appealable order before the Commissioner of Income Tax (Appeals) under Section 246A of the Income-tax Act 1961. The appeal is filed in Form 35 on the e-filing portal, generally within 30 days of the date of service of the intimation. For an obvious clerical or tax-credit matching error, however, a Section 154 rectification resolves the matter far faster than a full appeal.

When should I use Section 154 rectification instead of replying to the intimation?

Use Section 154 when the intimation contains a mistake apparent from the record — a TDS credit now showing in Form 26AS that CPC could not see, a wrongly computed interest figure, or a deduction correctly claimed but not allowed. Both you and CPC can rectify suo moto within 4 years from the end of the financial year in which the order was passed. Rectification cannot be used to introduce fresh, debatable claims that require investigation.

My refund is lower than I claimed. What do I do?

Compare the intimation's two-column table — "As provided by taxpayer" versus "As computed under 143(1)" — line by line. Most reductions trace to a TDS or advance-tax mismatch with Form 26AS or AIS, or a deduction disallowed because a schedule was left blank. If the return data was correct, respond "Disagree" on the portal within 30 days with evidence; if CPC was right, no action is needed and the corrected refund is credited to your pre-validated bank account.

Why was my refund credited to the wrong account or not at all?

A refund determined under Section 143(1) is released only to a bank account that has been pre-validated and nominated for refund on the e-filing portal. If your account is not pre-validated, the IFSC changed after a bank merger, or the PAN name does not match bank records, the refund fails. Re-validate the account under the Profile section and raise a Refund Reissue request — no fresh ITR is required.

Does responding to the intimation stop interest from accruing?

Interest under Sections 234A, 234B and 234C is computed up to the date of the intimation. If you genuinely owe the demand, paying it promptly limits further interest under Section 220(2), which runs at 1% per month on an unpaid 143(1) demand once the 30-day payment period lapses. If you disagree, filing your response or rectification within the window keeps the demand from being enforced while it is under review.