Got a Defective Return Notice u/s 139(9)? How to Respond Within 15 Days

Every filing season the Centralised Processing Centre (CPC) in Bengaluru issues large numbers of notices under Section 139(9) of the Income-tax Act, 1961, flagging returns as 'defective'. You get exactly 15 days from the date you receive the notice to respond, and ignoring it can convert a filed return into an invalid one for assessment year 2026-27. This guide walks through the statute, the e-filing steps and a worked example for a salaried taxpayer earning Rs 14,00,000.

The Scenario

Consider Rhea, a salaried professional in Pune whose employer deducted Rs 1,05,000 of TDS during FY 2025-26 and reported a gross salary of Rs 14,00,000 in her Form 16, Form 26AS and the Annual Information Statement (AIS). While filing her return on the e-filing portal she keyed her salary as Rs 12,00,000 by mistake, yet still claimed the full Rs 1,05,000 TDS credit. Three weeks later, on 10 August 2026, an email from CPC lands: her return is defective under Section 139(9).

The mismatch is the trigger. The portal's automated checks compare the income you offer against the TDS and receipts already reported in your Form 26AS and AIS. When you claim a TDS credit of Rs 1,05,000 but offer only Rs 12,00,000 of the Rs 14,00,000 that appears in your Form 26AS, the system cannot reconcile the two figures and marks the ITR defective. Rhea now has 15 days from 10 August 2026 to correct it or her return risks being treated as never filed.

Defective-return notices are not limited to salary mismatches. The Income Tax Department's FAQ at incometax.gov.in lists several recurring defects, and the five most common are set out below with the correction each one demands.

Statutory Answer

Section 139(9) of the Income-tax Act, 1961 empowers the Assessing Officer to treat a return as defective where it is incomplete or internally inconsistent, and to give the taxpayer an opportunity to rectify the defect within 15 days of the intimation, or such further period the officer may allow on a written request. The full provision, including its Explanation listing what makes a return defective, is reproduced on indiacode.nic.in.

Under the proviso to Section 139(9), if the defect is not rectified within the 15-day window the return is treated as an invalid return, as though you had never filed it for assessment year 2026-27. That single consequence carries a chain of others: any refund claim lapses, losses cannot be carried forward under Section 139(3), and interest under Section 234A can run from the original due date because there is no valid return on record.

The same proviso softens the edge. It allows the Assessing Officer to condone a delay where you rectify the defect after the 15 days but before the assessment is completed. The Income Tax Department's FAQ on responding to a defective notice at incometax.gov.in confirms that a taxpayer may also seek an adjournment or extension of the 15-day period, and may authorise a representative such as a chartered accountant to file the response. What you cannot do, per the same FAQ, is edit or withdraw a response once it is submitted on the portal, so accuracy on the single attempt matters.

The mechanics of responding are set out on the e-filing portal under 'Pending Actions' then 'e-Proceedings', and the steps below map the 15-day clock to the action each stage requires.

Worked Resolution

Return to Rhea's numbers, because the defect is not cosmetic: under-reporting her salary pushed her into a lower tax bracket and inflated her refund. Under the new regime for FY 2025-26 the standard deduction is Rs 75,000 and the Section 87A rebate rises to Rs 60,000 where total income does not exceed Rs 12,00,000, per the slabs Oquilia tracks in its income tax calculator.

As originally filed, Rhea offered Rs 12,00,000 of salary. After the Rs 75,000 standard deduction her taxable income was Rs 11,25,000, which sits below the Rs 12,00,000 rebate threshold. Her computed tax of Rs 52,500 was therefore wiped out entirely by the Section 87A rebate, so the portal would have refunded the whole Rs 1,05,000 of TDS. That is precisely the outcome Section 139(9) exists to stop.

Once she corrects the salary to the Rs 14,00,000 shown in her Form 26AS, taxable income becomes Rs 13,25,000, which exceeds Rs 12,00,000, so the Section 87A rebate no longer applies. The table below sets the two computations side by side using the new-regime slabs; you can reproduce either one in the new regime calculator.

The corrected tax of Rs 78,750 is built slab by slab: nil on the first Rs 4,00,000, 5 per cent on the next Rs 4,00,000 (Rs 20,000), 10 per cent on the next Rs 4,00,000 (Rs 40,000) and 15 per cent on the remaining Rs 1,25,000 (Rs 18,750). Adding 4 per cent health and education cess of Rs 3,150 gives Rs 81,900, so Rhea's genuine refund is Rs 23,100, not the Rs 1,05,000 the defective return would have released. Filing the corrected response within 15 days keeps her tax refund legitimate and closes the file without penalty.

Had Rhea instead let the 15 days lapse, her return would have become invalid, her Rs 23,100 refund claim would have disappeared, and any business or capital loss she wanted to carry forward would have been forfeited under the carry-forward rules. Given that the correction takes minutes on the portal against those stakes, responding inside the window is always the rational choice.

FAQ

What is the deadline to respond to a Section 139(9) notice?

You have 15 days from the date you receive the notice, per Section 139(9) of the Income-tax Act, 1961. You may request an extension of this 15-day period through the e-filing portal, and the Income Tax Department's FAQ at incometax.gov.in confirms the Assessing Officer can condone a later correction if it is made before the assessment is completed.

What happens if I do not respond within 15 days?

Under the proviso to Section 139(9), your return is treated as an invalid return, meaning it is regarded as never filed for assessment year 2026-27. Consequences include loss of any refund claim, disallowance of loss carry-forward under Section 139(3), and interest under Section 234A running from the original due date.

Can I file a revised return instead of responding to the notice?

Yes, if the time limit under Section 139(5) has not expired you may file a fresh or revised return rather than using the defective-return response flow. For FY 2025-26 returns the revised-return window under Section 139(5) runs up to 31 December 2026, subject to any departmental extension notified on incometax.gov.in.

Can someone else respond on my behalf?

Yes. The Income Tax Department's FAQ at incometax.gov.in confirms you can authorise a representative, such as a chartered accountant or an authorised e-Return Intermediary, to file the Section 139(9) response through the portal on your behalf within the 15-day window.

Can I edit my response after submitting it?

No. Once you submit the response to a Section 139(9) notice on the e-filing portal it cannot be updated or withdrawn, per the departmental FAQ at incometax.gov.in. Recompute your tax and validate every schedule before you press submit, because you get a single attempt.

Does responding to a defective notice attract a late-filing fee?

Correcting a defect under Section 139(9) is not itself a fresh filing, so no separate Section 234F late fee arises merely for responding within the 15 days. However, if the underlying return was already belated, the Section 234F fee of up to Rs 5,000 applicable to the original filing continues to stand.

How do I check whether my refund changes after correcting the defect?

Recompute your liability using the new-regime slabs before submitting. Rhea's refund fell from an incorrect Rs 1,05,000 to a correct Rs 23,100 once her Rs 14,00,000 salary was fully offered; you can model your own figures in Oquilia's income tax calculator and cross-check the TDS credit in the TDS calculator.