Defective Return (Section 139(9))
A return of income is treated as defective under Section 139(9) when it fails to meet prescribed conditions — such as missing annexures, unsigned returns, or mismatched tax payments — and the assessee is given 15 days to rectify the defect, failing which the return is treated as invalid.
Section 139(9) empowers the Assessing Officer or the Centralised Processing Centre to treat a return as defective if it does not conform to specified conditions. The Income Tax Rules 1962 prescribe the conditions under Rule 12, and common defects include: filing under an incorrect ITR form (e.g., using ITR-1 when ITR-2 is required because of capital gains), not including the required tax computation, mismatch between the TDS Schedule and Form 26AS data that renders the return inconsistent, income not computed in accordance with the Act's provisions, self-assessment tax not paid before filing, or the return being filed for the wrong assessment year.
Upon identifying a defect, the CPC or AO issues a defect intimation under Section 139(9) specifying the exact defect and providing an initial 15-day window to submit a rectified return. In practice, the e-filing portal issues an automated notice under Section 139(9) which the taxpayer can view under 'e-Proceedings.' The taxpayer must log in, acknowledge the defect notice, and submit a corrected return addressing the identified issues within the stipulated time.
If the 15-day window lapses without remedial action, the return is deemed invalid and treated as if it was never filed. The consequences are severe: the taxpayer loses the protection of having filed a return (which can invite best judgment assessment under Section 144), loses carry-forward rights for losses, and may face interest and penalties as if no return was filed. In practice, the portal allows for an extension request which the AO can grant if good cause is shown.
A nuance frequently encountered in practice involves the selection of the wrong ITR form. If a salaried individual files ITR-1 but has more than one house property, or has foreign assets/income, or has income from other sources beyond salary and one house property, the return will be marked defective. Similarly, filing ITR-2 when the individual has F&O trading income (which is business income requiring ITR-3) is a common defect basis. Taxpayers who receive such notices often need to switch to the correct form and re-file, ensuring all data is accurately migrated from the original submission.