How to respond to a Section 143(1)(a) prima facie adjustment notice through e-Proceedings on the income tax portal

A Section 143(1)(a) prima facie adjustment notice is one of the most common pieces of post-filing correspondence the Centralised Processing Centre (CPC) in Bengaluru sends, and it lands in inboxes within weeks of a return being filed for Assessment Year 2025-26. Unlike a scrutiny notice under Section 143(2), this is an automated communication proposing to alter your return before the intimation under Section 143(1) is finalised. You have exactly 30 days to respond through the e-Proceedings tab, and silence is treated as consent to the adjustment. This guide walks through the statute behind the notice and the precise portal workflow verified against the Income Tax Department e-Proceedings user manual as of June 2026.

The Scenario

Picture a salaried taxpayer who filed an ITR-1 for FY 2025-26 declaring a gross salary of Rs 14,00,000 and claiming Section 80C deductions of Rs 1,50,000 under the old regime. Three weeks later, an email from CPC arrives with the subject line "Communication of proposed adjustment u/s 143(1)(a)". The PDF attachment shows a variance: the system has flagged that the Schedule VIA sub-totals entered in the return add up to only Rs 90,000, yet Rs 1,50,000 was claimed as the aggregate deduction. CPC proposes to restrict the tax deduction to the substantiated Rs 90,000, adding Rs 60,000 back to total income.

This is a classic prima facie adjustment: an arithmetical or internal-consistency error apparent from the return itself, not a judgement call about whether an expense was genuine. The reader's question is practical, not philosophical. Should they Agree and pay the extra demand, or Disagree and substantiate the claim? And procedurally, where exactly on the portal does the response go, given that the 30-day clock starts from the date printed on the notice? Getting the Assessment Year and the date of communication right matters, because a response filed on day 31 is rejected and the adjustment becomes part of the intimation automatically.

Statutory Answer

Section 143(1)(a) of the Income-tax Act, 1961 permits CPC to make six categories of adjustment while processing a return, before issuing the intimation. The clauses are narrow and exhaustive. The table below sets out each one as it stands in the statute on indiacode.nic.in.

Two procedural safeguards are built into the section. The first proviso states that no adjustment shall be made unless an intimation is given to the assessee, in writing or electronically, of the proposed adjustment. The second proviso requires that the response received within 30 days of issue of such intimation be considered before any adjustment is made, and that where no response is received within 30 days, the adjustment shall be made. This 30-day window is the single most important date on the notice. Clause (vi), which relates to income appearing in Form 26AS, has been rendered largely inoperative since AY 2018-19, so most live notices today cite clause (i) or clause (ii).

Separately, Section 143(1) caps the time for CPC to issue the final intimation at nine months from the end of the financial year in which the return is furnished. For a return filed during FY 2025-26, the outer limit for the intimation is therefore 31 December 2026.

Worked Resolution

Return to the salaried taxpayer above and work the numbers under the old regime slabs for FY 2025-26. The reader can replicate every figure using the Oquilia income tax calculator, and can sanity-check whether the old regime even remains the better choice using the old vs new regime comparison.

The proposed adjustment of Rs 60,000 to total income raises the tax liability by Rs 18,720. If the taxpayer genuinely invested Rs 1,50,000 in eligible 80C instruments but mis-keyed the Schedule VIA breakdown, the correct move is to Disagree, attach the investment proof, and let CPC restore the full deduction. If, on the other hand, only Rs 90,000 was actually invested, the taxpayer should Agree, after which the Rs 18,720 plus interest under Section 234B and 234C becomes payable through a revised computation.

The verified e-Proceedings workflow, confirmed against the Income Tax Department user manual, runs as follows. Log in at incometax.gov.in, then navigate to Pending Actions, then e-Proceedings, then Self. Locate the proceeding labelled "Adjustment u/s 143(1)(a)" and open the Notice or Letter PDF to read the exact variance. Click Submit Response or Provide Response. For each variance line that CPC has listed, select Agree or Disagree from the dropdown, and click Save after each entry, because the portal does not auto-save between rows. Where you Disagree, the system opens a reason field and an attachment slot for documentary proof such as the Form 16 or investment receipts. After all rows are saved, tick the final declaration checkbox and submit. The portal then generates a Transaction ID, which is your proof of timely filing and should be retained until the intimation under Section 143(1) is issued.

One practical caution on timelines: the 30-day period runs from the date of issue printed on the communication, not the date you happened to open the email. If a notice is dated 5 June 2026, the response is due by 4 July 2026. Because TDS mismatches are a frequent trigger for these notices, reconciling your salary TDS against Form 26AS before filing, using the Oquilia TDS calculator, prevents most clause (i) and clause (ii) variances from ever arising. If a 143(1) intimation already issued carries an error, the remedy shifts to a Section 154 rectification request rather than a 143(1)(a) response.

FAQ

What happens if I miss the 30-day deadline to respond to a 143(1)(a) notice?

Under the second proviso to Section 143(1)(a), where no response is received within 30 days of the issue of the intimation, the proposed adjustment is made automatically and carried into the intimation under Section 143(1). In the worked example, that means the Rs 60,000 addition and the Rs 18,720 extra tax stand. Your only remaining route is a Section 154 rectification or an appeal, both of which are slower than a timely Disagree response.

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

No. A 143(1)(a) communication is an automated, prima facie adjustment proposed by CPC during processing and is limited to the six clauses listed in the statute. A Section 143(2) scrutiny notice initiates a detailed examination of the return by an Assessing Officer and can be issued up to three months from the end of the financial year in which the return is filed. The two are distinct proceedings with different consequences.

Can I revise my return instead of responding to the notice?

If the variance reflects a genuine mistake in your original return and the due date for filing a revised return under Section 139(5) has not passed, filing a revised return can resolve the issue. For FY 2025-26, the revised return window generally runs until 31 December 2026. However, the safer course is to respond within the 30-day e-Proceedings window first, because a revised return does not stop the 143(1)(a) clock.

What documents should I attach when I Disagree with an adjustment?

Attach the specific proof that contradicts the variance. For an 80C dispute, that means investment receipts, PPF or ELSS statements, or a corrected Form 16. For a salary mismatch under clause (i), attach Form 16 and a Form 26AS extract showing the reconciled figures. The portal accepts attachments against each Disagree row, and the advance tax and self-assessment challans should also be uploaded if the dispute concerns tax credit.

Will I be charged interest if I agree to the adjustment?

Yes. If you Agree and additional tax becomes payable, interest under Sections 234B and 234C applies on the shortfall in advance tax, computed up to the date of payment. In the worked example, the Rs 18,720 additional tax would attract interest at 1% per month on the unpaid advance tax instalments, so settling quickly limits the interest cost.

Does responding to a 143(1)(a) notice increase my chance of scrutiny?

There is no provision in the Income-tax Act, 1961 linking a 143(1)(a) response to selection for scrutiny under Section 143(2). Scrutiny selection is governed by the Central Board of Direct Taxes risk-management parameters, not by whether you Agreed or Disagreed during processing. Responding accurately and on time is the correct compliance behaviour regardless.

How will I know the outcome after I submit my response?

Once CPC considers your response, it issues the intimation under Section 143(1), which must be sent within nine months from the end of the financial year in which the return was filed, that is, by 31 December 2026 for an FY 2025-26 filing. The intimation states whether your Disagree was accepted, whether a refund is due, or whether a demand stands. You can track the status under e-Proceedings using the Transaction ID generated at submission.