Reassessment and revision are different Indian income-tax procedures. Reassessment asks whether income escaped assessment and should be assessed or recomputed. Revision examines an existing order under a specific statutory power. The first practical step is to identify the tax year, the notice or order date, and whether the matter falls under the Income Tax Act, 1961 or the Income Tax Act, 2025. The transition taking effect on 1 April 2026 can determine the governing law even when a proceeding occurs after that date.
Reassessment and revision at a glance
These terms are not interchangeable, and a taxpayer generally cannot choose whichever route is more convenient. The authority, statutory trigger, documents and limitation period depend on the route actually used.
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| Point | Reassessment | Revision |
|---|---|---|
| Core question | Has income escaped assessment so that it should be assessed, reassessed or recomputed? | Does an existing order qualify for revision under the particular statutory provision? |
| Typical trigger | A statutory notice and the authority’s stated basis for examining escaped income. | A revenue authority’s revision proceeding under section 263 (or section 377 under the 2025 Act), or an application route such as section 264 under the 1961 Act. |
| Who starts it | The Assessing Officer through the statutory notice process. | The route controls the initiator. Section 263 is a revenue-initiated mechanism; section 264 is a separate revision application route. |
| Threshold | The statutory conditions for examining escaped income, including the required notice and any applicable pre-notice procedure or exception. | For section 263, the order must be both erroneous and prejudicial to the interests of the revenue. |
| What you should locate first | The notice, the relevant tax year, service date, stated information or basis, response deadline and any pre-notice communication. | The order, the exact revision provision, who invoked it, the statutory conditions and the limitation computation. |
| General time statement in the Department’s FAQs | An order under section 279 is generally due within one year from the end of the financial year in which the section 280 notice was served, subject to exclusions and extensions. | For old section 263 and new section 377, the general outer limitation is two years from the end of the financial year in which the order sought to be revised was passed, subject to statutory computation rules. |
The periods in the table are general statutory summaries, not personalized deadlines. Service dates, exclusions, extensions and the procedural history can change the calculation.
Start with the tax year and 1 April 2026 transition
The governing Act is determined primarily by the tax year and the transition rules, not simply by the date printed on a notice. The Income Tax Department states that the Income Tax Act, 2025 reassessment provisions—sections 279 to 286—apply to Tax Year 2026–27 and later. For a tax year beginning before 1 April 2026, the Income Tax Act, 1961 generally continues to govern reassessment and other listed proceedings, including revision.
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Proceedings for Tax Year 2026–27 and later
For these tax years, the new Act’s reassessment framework applies. In the framework described by the Department, a section 280 notice precedes a section 279 assessment, reassessment or recomputation. The Department also describes a general section 281 pre-notice procedure, while identifying exceptions for specified information or directions. Therefore, the sequence is not identical in every case.
Proceedings for a tax year that began before 1 April 2026
The repealed 1961 Act continues to apply to proceedings pending when the new Act commenced and to proceedings initiated from 1 April 2026 in respect of a tax year beginning before that date. This includes reassessment, revision and appeals identified by the transition rules. A proceeding can therefore occur after 1 April 2026 and still be governed by the 1961 Act because of the tax year concerned.
Pending and fresh old-law proceedings
Pending reassessment proceedings under the old law remain under the 1961 Act. The Department also says that fresh proceedings for earlier tax years may be initiated after 1 April 2026 under the old Act if its conditions are met. An old section 148A(1) notice issued before commencement can lead to later steps under the 1961 Act, subject to the old section 149 limitation.
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The change of Acts does not revive a limitation period that already expired. An expired appeal, revision or reference period is not automatically reopened because the 2025 Act has a different or extended period. Condonation may be available under the old Act where that law’s requirements are satisfied, but it is not automatic.
What income-tax reassessment means
Reassessment is the process used when the tax authority considers that income escaped assessment and needs to be assessed or recomputed. It is not merely a second opinion on every unfavorable assessment order. The notice and the information or statutory basis identified by the authority matter.
The new Act’s notice sequence
Under the Department’s explanation of the 2025 Act, the Assessing Officer cannot make a section 279 assessment, reassessment or recomputation without issuing a section 280 notice. The Department’s exact statement is:
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“No, the AO shall not make any assessment, reassessment or recomputation under section 279 without issuing a notice under section 280 which is corresponding to section 148 of the Income Tax Act, 1961 .”
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The Department also describes a general section 281 pre-notice procedure. It lists exceptions, including cases involving specified information or directions. Read the actual communication to determine whether the ordinary pre-notice sequence applies; do not assume every matter has the same steps.
What to examine in a reassessment notice
- The tax year or assessment year to which it relates.
- The section cited and whether the notice is under the 1961 Act or the 2025 Act.
- The date on which the notice was served, not only the date shown on the document.
- The information, direction or other stated basis for the proposed action.
- The response method and deadline specified in the notice.
- Whether an earlier pre-notice communication was issued and answered.
A notice can require a response even when you believe the proposed reassessment is wrong. Preserve the notice, attachments, service record and any earlier correspondence before preparing the response.
General timing for a section 279 order
The Department says a reassessment order under section 279 is generally due within one year from the end of the financial year in which the section 280 notice was served. The FAQ notes extensions and exclusions for specified cases. Treat this as a general rule rather than a deadline calculator: the applicable tax year, service date, exclusions and procedural events must be checked against the statute.
What revision means
Revision is a statutory review of an existing order. It is not another name for reassessment and does not automatically involve escaped income. The exact rights and procedure depend on the revision provision invoked.
Section 263: revenue revision under the 1961 Act
Section 263 is a revenue authority’s revision mechanism. The Department states that the jurisdictional condition is that the Assessing Officer’s order must be both erroneous and prejudicial to the interests of the revenue. A taxpayer’s disagreement with the result, standing alone, should not be described as automatically meeting that test.
Because section 263 is a revenue revision route, it is not the taxpayer’s ordinary appeal option and should not be presented as a procedure the taxpayer can elect instead of responding to a notice. The order being examined, the authority exercising jurisdiction and the statutory opportunity to respond control the case.
Section 264: a separate application route
Section 264 is distinct from section 263. It concerns a separate revision application route under the 1961 Act. The Department says an application under section 264 that is pending on 1 April 2026 is to be disposed of under the 1961 Act, with its rights, scope, limitation and powers governed by that Act.
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Section 377 under the 2025 Act
For the new Act, section 377 corresponds to the revenue revision function described for old section 263. The same core distinction remains important: identify the provision, the order under review and the statutory threshold rather than treating “revision” as a single universal remedy.
General limitation for section 263 and section 377
The Department describes the general outer limitation as two years from the end of the financial year in which the order sought to be revised was passed. It also notes exclusions and, for the new Act, an express 60-day residual-period rule. Exact computation depends on statutory exclusions and the case history.
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Reassessment versus revision: the practical differences
| Decision point | Reassessment | Revision |
|---|---|---|
| Subject of the proceeding | Income said to have escaped assessment and the resulting assessment or recomputation. | An existing assessment or other order that is being reviewed under a specified revision power. |
| Initiator | Assessing Officer through the applicable notice process. | Depends on the provision. Section 263/377 is a revenue route; section 264 is an application route under the 1961 Act. |
| Initial document | Notice, including the applicable section, tax year, service date and stated basis. | Revision notice or order, or an application and the order it challenges, depending on the route. |
| Legal threshold | Conditions for assessing escaped income, including notice and any pre-notice requirement or exception. | For section 263/377, an order that is both erroneous and prejudicial to revenue. |
| Act to check | 2025 Act for Tax Year 2026–27 onward; generally 1961 Act for a tax year beginning before 1 April 2026. | 1961 Act for the saved and earlier-tax-year proceedings described in the transition rules; section 377 for the new Act’s corresponding revenue revision. |
| General time statement | One year from the end of the financial year in which the section 280 notice was served for a section 279 order, subject to exclusions and extensions. | Two years from the end of the financial year in which the order sought to be revised was passed for old section 263/new section 377, subject to computation rules. |
| Taxpayer’s immediate task | Answer the notice by its stated deadline, preserve evidence and address the alleged escaped income and procedural objections. | Identify the provision, order, authority, threshold and limitation; respond to a revenue notice or assess whether an application route is legally available. |
How to identify the correct route: a step-by-step method
- Write down the tax year. Use the year shown in the notice or order and confirm when that tax year began. A label such as “assessment year” in older records may need to be matched to the relevant tax year used for the transition analysis.
- Mark 1 April 2026. Decide whether the tax year began before that date or is Tax Year 2026–27 or later. Then check whether the transition rules save an old-law proceeding.
- Classify the document. A notice alleging escaped income points toward reassessment. A notice or order referring to revision, section 263, section 264 or section 377 requires a revision analysis.
- Record the initiating authority. Note the Assessing Officer, revisional authority or applicant. Section 263 is not a taxpayer-controlled appeal route.
- Identify the statutory section. Do not rely on the word “revision” alone. Section 263, section 264 and section 377 do not perform the same function.
- Calculate dates from the correct event. For reassessment, start with service of the relevant notice. For revision, start with the date the order sought to be revised was passed, then apply exclusions, extensions and any residual-period rule.
- Check the case history. Look for earlier notices, replies, orders, pending proceedings and any condonation request. The transition does not restart an expired period.
- Obtain the current statutory text and case documents. The Department’s FAQs provide a useful summary, but the statute, rules and the actual record determine the application in an individual case.
What to do after receiving a reassessment communication
1. Preserve the record
Download or copy the complete notice, annexures, portal history, email or physical-service proof and earlier correspondence. Keep the original files and note the time zone and date shown for electronic service.
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2. Verify the tax year and Act
Check whether the matter concerns a tax year beginning before 1 April 2026, Tax Year 2026–27 or a later year, and whether the notice cites the 1961 or 2025 Act. A post-1 April 2026 communication can still concern an old-law tax year.
3. Map the stated basis to your records
Compare the information in the notice with returns, financial statements, withholding records, transaction evidence and prior submissions. Separate facts you can prove from assumptions that require clarification.
4. Meet the stated response deadline
Use the response channel and format specified in the notice. If records cannot be obtained in time, document the request and seek any available procedural relief rather than ignoring the communication.
5. Preserve objections separately from factual evidence
Keep a clear record of factual explanations, document references and legal or procedural objections. Do not assume that sending documents alone answers a notice that asks a specific question.
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6. Obtain case-specific advice when the stakes or dates are material
An Indian chartered accountant or tax lawyer experienced with reassessment can review the notice, tax year, service date and procedural history. Verify the professional’s jurisdiction, scope and current understanding of the applicable Act before relying on advice.
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What to do when revision is mentioned
Identify whether it is section 263, section 264 or section 377
Read the provision cited in the notice or application. For section 263 or section 377, ask whether the authority alleges both an error in the order and prejudice to the interests of the revenue. For section 264, determine whether the proposed application is legally available under the 1961 Act and what conditions and limitation rules apply.
Collect the order under review
Revision cannot be analyzed without the order that is said to be erroneous or otherwise eligible for review. Obtain the signed order, computation, reasons, notices, replies and evidence considered when it was passed.
Check authority and limitation
Confirm who issued the revision communication and whether that person or office is exercising the cited power. For old section 263 and new section 377, use the two-year general outer limitation only as a starting point; calculate exclusions and the new Act’s 60-day residual-period rule where relevant.
Do not treat a revision notice as an appeal
A section 263 proceeding is a revenue revision mechanism. The response should address the statutory threshold and the record supporting the order, while any separate appeal or other remedy must be assessed under the applicable Act and procedural history.
Common mistakes and how to avoid them
- Using “reassessment” and “revision” as synonyms. Start with the document and section, not the label used in casual conversation.
- Looking only at the notice date. The tax year and the date of service or the date of the order under review can control the limitation analysis.
- Assuming every new-law case follows one sequence. The 2025 Act framework includes a general pre-notice procedure and stated exceptions.
- Assuming a post-1 April 2026 notice automatically uses the 2025 Act. Earlier-starting tax years and saved proceedings can remain under the 1961 Act.
- Treating section 263 as the taxpayer’s appeal. It is a revenue revision route with the error-and-prejudice threshold.
- Conflating sections 263 and 264. They are separate routes with different functions and participants.
- Counting a general period without checking exclusions. The one-year and two-year statements are not personalized deadline calculations.
- Expecting repeal to revive an expired remedy. A new limitation period does not automatically reopen an old, expired appeal or revision period.
- Relying on an FAQ instead of the record. The statutory text, rules, notice, service proof and order determine an individual case.
Questions to answer before taking any action
| Question | Why it matters |
|---|---|
| What tax year is involved, and when did it begin? | It helps determine whether the 1961 Act or 2025 Act transition rules apply. |
| What document did you receive? | A notice alleging escaped income is analyzed differently from a revision notice or an application concerning an existing order. |
| Which section is cited? | Sections 279, 280 and 281 concern the new reassessment framework; sections 263 and 264 are distinct old-law revision routes; section 377 is the new-law revenue revision provision. |
| When was the notice served or the order passed? | Those events anchor the general timing statements, subject to statutory computation. |
| Was a proceeding already pending on 1 April 2026? | Pending proceedings and proceedings for earlier-starting tax years can remain under the 1961 Act. |
| Has any limitation period already expired? | The new Act does not automatically revive an expired old-law period. |
Bottom line for taxpayers
Reassessment concerns alleged escaped income; revision concerns review of an existing order under a particular statutory power. Section 263 is a revenue mechanism requiring an order that is both erroneous and prejudicial to revenue, while section 264 is a separate application route. For current matters, determine the tax year first: the 2025 Act’s reassessment provisions apply to Tax Year 2026–27 and later, while earlier-starting tax years and saved proceedings can remain under the 1961 Act. Then identify the exact section, preserve the notice or order, and calculate the relevant period from the correct event with all statutory exclusions and extensions.
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