What to do when you get a defective return notice under Section 139(9) - the 15-day rule

A Section 139(9) notice means the Income Tax Department has found your return defective. The Income-tax Act, 1961 allows 15 days to cure the defect, and an uncured return can be treated as invalid.

The Scenario

You filed your ITR for assessment year 2026-27 (FY 2025-26) under the new tax regime, and an email now says the return is defective under Section 139(9). The Department's FAQ on defective notices confirms such notices go to your registered email ID or by post, and can be viewed after logging in to the e-Filing portal.

The same FAQ describes a defective return as one with incomplete or inconsistent information in the return or its schedules, and lists 5 common errors that make a return defective under Section 139(9):

Take a salaried taxpayer with a gross salary of Rs 11,40,000 who also earned Rs 80,000 of fixed deposit interest, on which the bank deducted Rs 8,000 of TDS. The return claimed that Rs 8,000 back as a refund but left the interest out of income, which is the first error on the Department's list. The notice starts a 15-day clock, and two questions follow: how long is the window, and what does the fix cost?

Statutory Answer

Section 139(9) lets the Assessing Officer intimate the defect and give you an opportunity to rectify it "within a period of fifteen days from the date of such intimation", or within a further period that the officer may allow, at discretion, on an application made for it. The full text is on Indian Kanoon.

If the defect is not rectified within those 15 days, or the extended period, the return "shall be treated as an invalid return" and the Act applies as if you had failed to furnish the return. A proviso softens this: where the defect is rectified after the period expires but before the assessment is made, the Assessing Officer may condone the delay and treat the return as valid. Condonation is discretionary, not a right.

Under the Explanation to Section 139(9), a return is regarded as defective unless all of these conditions are fulfilled:

Two carve-outs matter. Under the proviso to clause (c)(i), missing proof of TDS or TCS does not make the return defective if the certificate was not furnished to you under Section 203 or Section 206C and is produced within the two-year period specified in Section 155(14). A further proviso lets the Board, by notification in the Official Gazette, disapply or modify any of conditions (a) to (f) for a class of assessees.

The portal's FAQ counts the 15 days from the date you receive the notice, or uses the period the notice specifies, and says you may seek an adjournment and request an extension. Miss the window and the return may be treated as invalid, with penalty, interest, loss of the right to carry forward losses and loss of specific exemptions listed as possible consequences.

The window is enforced on screen too: Question 5 of the e-Proceedings FAQ says the Submit Response button can go inactive for CPC notices once the response due date has lapsed. A notice received on 14 September 2026, for example, reaches day 15 on 29 September 2026 on a plain count, unless the notice specifies a different period, so diarise the date printed on the notice.

There is one alternative: while the time allowed for filing a return for that assessment year is still open, the FAQ says you can file a fresh or revised return instead of responding. After that, only the Section 139(9) response remains, and a return left unanswered is treated as invalid or not filed for that year.

Worked Resolution

Part 3.1 of the e-Proceedings user manual sets out the Section 139(9) response. In short:

1. Log in to the e-Filing portal, click Pending Actions > e-Proceedings, then select Self.
2. Click View Notice against the Defective Notice u/s 139(9) and open the Notice/Letter pdf to read the defect.
3. Click Submit Response and select Agree or Disagree against the defect details.
4. On Agree, choose the mode of response, select the ITR type and upload the corrected JSON file; the FAQ adds that the defect can also be corrected online in the ITR form.
5. On Disagree, write your reason for disagreeing with the defect.
6. Tick the declaration and submit, then note the Transaction ID shown and the confirmation sent to your registered email ID.

Before choosing Agree, rebuild the computation. For FY 2025-26 the new-regime slabs are nil up to Rs 4 lakh, 5% to Rs 8 lakh, 10% to Rs 12 lakh and 15% to Rs 16 lakh, the standard deduction is Rs 75,000, and the Section 87A rebate of up to Rs 60,000 applies where total income does not exceed Rs 12 lakh; cess is 4%. Our AY 2026-27 slab guide walks through the full ladder. The table runs the example, alongside a second taxpayer with a Rs 15,00,000 salary and the same Rs 80,000 omission, whose employer deducted exactly the Rs 97,500 due on salary.

For the Rs 11.4 lakh earner, the correction costs nothing in tax. Adding Rs 80,000 lifts total income to Rs 11,45,000, still Rs 55,000 below the Rs 12 lakh ceiling, so the rebate absorbs all Rs 54,500 of slab tax and the Rs 8,000 refund stands; salary alone attracted no tax after the rebate, so the employer deducted nothing. What is at stake is the return: left uncured, Section 139(9) treats it as invalid, and the Rs 8,000 refund claim sits inside that return.

For the Rs 15 lakh earner, the same omission understated tax by Rs 12,480 (Rs 1,09,980 against Rs 97,500), so the corrected return turns an Rs 8,000 refund claim into a Rs 4,480 balance before any interest. Section 140A requires tax payable on the basis of a return under Section 139, together with interest for any delay in furnishing the return or in paying advance tax, to be paid before the return is furnished, with proof of payment attached. Pay the balance as self-assessment tax first; clause (c)(i) of the Explanation to Section 139(9) also expects proof of self-assessment tax claimed.

Run your own figures through the new-regime income tax calculator, and use the TDS calculator to tie each deduction in Form 26AS to the receipt it came from.

Choose Disagree only when the defect itself is wrong, for instance where the Rs 80,000 was in fact reported under Income from Other Sources. State the head and the amount in the reason, because Question 6 of the e-Proceedings FAQ confirms a submitted response cannot be edited afterwards.

FAQ

How many days do I get to respond to a Section 139(9) notice?

Section 139(9) allows 15 days from the date of intimation, extendable at the Assessing Officer's discretion on your application. The portal FAQ counts from the date you receive the notice, or uses the period the notice specifies, and lets you seek an adjournment.

What happens if I miss the 15-day deadline?

The Department's FAQ says the return may be treated as invalid, with penalty, interest, non-carry-forward of losses and loss of specific exemptions as possible consequences. The proviso to Section 139(9) lets the Assessing Officer condone the delay if you rectify the defect before assessment, but that is discretionary, and the Submit Response button can go inactive for CPC notices after the due date.

Can I file a revised return instead of responding?

Yes, but only while the time for filing a return for that assessment year is still open, per the Department's FAQ. After that, the Section 139(9) response is the only route.

Can I change or withdraw my response after submitting it?

No. Both the defective-notice FAQ and Question 6 of the e-Proceedings FAQ say a submitted response cannot be updated, edited or withdrawn, so check the corrected JSON against Form 26AS and your AIS first.

Can someone else respond on my behalf?

Yes. The FAQ says you can authorise another person to respond to a Section 139(9) notice, and Question 24 of the e-Proceedings FAQ adds that only one authorised representative can be active at a time for a proceeding.

Do I need to e-verify my response?

No. Question 20 of the e-Proceedings FAQ says a response submitted there does not need to be e-verified.

Is a defective return notice the same as a Section 143(1)(a) adjustment?

No. A Section 139(9) notice says the return is defective and allows 15 days, while a prima facie adjustment under Section 143(1)(a) proposes changes during processing and, per the portal's user manual, needs a response within 30 days from the date of issue. Our guide to responding to a Section 143(1)(a) adjustment covers that route.