Reassessment is the process by which the income tax authorities reopen a previously completed assessment to bring to tax income that has "escaped assessment" — that is, income that was not assessed or was under-assessed in the original proceedings. Under Indian law, reassessment is governed by Sections 147 to 151 of the Income Tax Act, 1961, requiring the Assessing Officer to issue a notice under Section 148 after following mandatory pre-conditions under Section 148A (inserted by Finance Act, 2021).
Legal definition
The Income Tax Act, 1961 provides the framework for reassessment:
Section 147: "If any income chargeable to tax, in the case of an assessee, has escaped assessment for any assessment year, the Assessing Officer may, subject to the provisions of sections 148 to 153, assess or reassess such income or recompute the loss or the depreciation allowance or any other allowance or deduction for the said assessment year."
Section 148: Requires the Assessing Officer to serve a notice on the assessee, requiring them to furnish a return of income, before making a reassessment. The Finance Act, 2021 inserted Section 148A, mandating a preliminary inquiry before issuing the Section 148 notice.
Section 148A: Requires the Assessing Officer to: (a) conduct an inquiry with prior approval of the specified authority, (b) provide the information to the assessee suggesting income has escaped assessment, (c) give the assessee an opportunity of being heard by serving a show cause notice, and (d) consider the reply and pass an order deciding whether it is a fit case for issuing a notice under Section 148.
Section 149: Prescribes the time limits — a notice under Section 148 can be issued within 3 years from the end of the relevant assessment year (for escaped income up to Rs 50 lakh), or within 10 years (where the escaped income exceeds Rs 50 lakh and the Assessing Officer has specific information from specified sources).
How courts have interpreted this term
Union of India v. Ashish Agarwal [(2022) 444 ITR 1 (SC)]
The Supreme Court addressed the validity of thousands of reassessment notices issued under the old Section 148 framework after 1 April 2021, when the new Section 148A procedure had come into effect. The Court held that all such notices must be deemed to have been issued under Section 148A, converting them to show cause notices and directing the Assessing Officers to follow the new procedure. This landmark judgment affected approximately 90,000 reassessment notices and established that the new procedural safeguards under Section 148A are mandatory.
Union of India v. Rajeev Bansal [(2024) 10 TMI 264 (SC)]
The Supreme Court resolved the TOLA (Taxation and Other Laws Act, 2020) controversy, holding that the pandemic-period extensions of time applied to reassessment notices for assessment years whose statutory deadlines fell within the COVID exclusion period. The Court mandated strict adherence to the post-April 2021 procedure: issuance of a show cause notice under Section 148A, provision of supporting material, and requisite higher-level sanctions under Section 151.
GKN Driveshafts (India) Ltd. v. ITO [(2003) 259 ITR 19 (SC)]
The Supreme Court established the foundational procedure for challenging reassessment notices: when a notice under Section 148 is issued, the assessee must file a return and, if they wish to challenge the reopening, request the Assessing Officer to provide the recorded reasons. The assessee can then file objections to the reopening, which the AO must dispose of by passing a speaking order before proceeding with the reassessment.
Why this matters
Reassessment is one of the most frequently litigated areas of Indian tax law. The power to reopen completed assessments represents a significant intrusion into the principle of finality, and the courts have consistently held that this power must be exercised within strict procedural guardrails. The 2021 amendments introduced Section 148A as a mandatory pre-condition, requiring the Assessing Officer to share the information suggesting escaped income and give the assessee an opportunity of being heard before issuing the reassessment notice.
For taxpayers, receiving a Section 148 notice can be deeply concerning, as it reopens settled assessments and potentially exposes previously accepted income computations to scrutiny. The time limits under Section 149 create two distinct windows: a 3-year window for smaller amounts of escaped income and a 10-year window for larger amounts (exceeding Rs 50 lakh), provided the information comes from specified sources such as search and seizure operations, survey, or information from other law enforcement agencies.
For practitioners, the key strategic considerations in reassessment cases involve challenging the jurisdictional conditions: whether the AO had "information" suggesting income has escaped assessment, whether the Section 148A procedure was duly followed, whether the reasons recorded are sufficient and based on tangible material rather than mere suspicion, and whether the notice is within the prescribed time limits. The Supreme Court's decisions in Ashish Agarwal and Rajeev Bansal have significantly clarified the procedural landscape and reinforced the mandatory nature of Section 148A safeguards.
Related terms
Broader concepts:
Related procedures:
Frequently asked questions
What is the time limit for issuing a reassessment notice?
Under Section 149, a notice under Section 148 can be issued within 3 years from the end of the relevant assessment year if the income escaping assessment amounts to or is likely to amount to Rs 50 lakh or less. For escaped income exceeding Rs 50 lakh, the notice can be issued within 10 years, provided the Assessing Officer has in their possession information derived from specified sources (such as search, survey, or information received from other authorities) and has obtained prior approval of the specified authority.
Can a reassessment notice be challenged?
Yes. Following the GKN Driveshafts procedure, an assessee who receives a Section 148 notice should file a return, request the reasons recorded by the AO for reopening, and file objections. If the objections are rejected, the assessee can challenge the reopening before the High Court under Article 226 of the Constitution. Courts regularly quash reassessment notices where the reasons are insufficient, based on mere suspicion, or where the Section 148A procedure was not followed.
What changed in reassessment law after 2021?
The Finance Act, 2021 replaced the old "reason to believe" standard with a new framework under Section 148A, requiring the AO to conduct a preliminary inquiry, share the information with the assessee, serve a show cause notice, consider the reply, and pass a speaking order before issuing the reassessment notice. This introduced a mandatory opportunity of hearing before the reassessment notice is issued, significantly strengthening taxpayer protections.
This entry is part of the Veritect Indian Legal Glossary, a comprehensive reference of Indian legal terminology grounded in statutory text and judicial interpretation.
Last updated: 2026-03-27. Veritect provides this content for informational purposes and does not constitute legal advice.