Yes—but not automatically and not without statutory safeguards. The Income Tax Department can reopen a completed assessment through reassessment proceedings when the applicable legal conditions, notices, approvals and limitation rules are satisfied. The governing framework depends first on the tax year under review.
For a tax year beginning before 1 April 2026, the Income-tax Act, 1961 generally governs reassessment, including many proceedings started or continuing after that date. The Income Tax Act, 2025 applies to tax year 2026–27 and later. The date a notice is issued does not, by itself, decide which Act applies.
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What reopening a completed assessment means
A completed assessment is not permanently immune from further examination. If the Department later has legally relevant information suggesting that income escaped assessment, it may begin reassessment under the Act that governs the year concerned. Reassessment is a formal statutory process, not an informal request to revisit an old file.
The Department must use the prescribed notice route, observe the applicable time limits and obtain any approval required by law. A notice that arrives years after an assessment was completed is therefore not automatically invalid, but neither does the notice prove that the Department has complied with every legal requirement. Its tax year, stated grounds, issuing authority, approval and response date all matter.
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The Department’s published guidance does not support the idea that an assessment can be reopened whenever an officer chooses. The power is controlled by statutory conditions, procedural safeguards and limitation provisions.
Which Act applies to the assessment?
Start by identifying the tax year under review, rather than relying only on the date printed on the notice. The Income Tax Department’s transition guidance draws the line at 1 April 2026.
| Tax year under review | Main reassessment framework | Important implication |
|---|---|---|
| Tax year beginning before 1 April 2026 | Income-tax Act, 1961, including sections 147, 148 and 148A and related provisions | The 1961 Act continues to govern specified pending matters and proceedings concerning these earlier years, even when initiated on or after 1 April 2026. |
| Tax year 2026–27 and later | Income Tax Act, 2025, sections 279–286 | The new Act’s reassessment procedure and deadlines apply to these years. |
The Department expressly states that the reassessment provisions in sections 279–286 of the 2025 Act apply to tax year 2026–27 and subsequent tax years. It also states that, for any tax year beginning before 1 April 2026, only the old-Act provisions apply for reassessment. Repeal or replacement of the 1961 Act therefore does not, by itself, erase rights, obligations or pending proceedings relating to earlier years.
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The Department’s FAQ describes a general sequence for tax year 2026–27 onward. Individual cases can differ because the Act contains exceptions, so the sequence should be read as the normal framework rather than a promise that every notice will look identical.
- Information suggesting escaped income. The Assessing Officer must have information indicating that income may have escaped assessment. The existence of an old assessment alone is not the stated trigger.
- Show-cause notice. The taxpayer is issued a notice setting out the information relied on and is given an opportunity to respond.
- Taxpayer’s reply. The taxpayer can address the information, explain why income was not escaped, identify factual errors and provide documents relevant to the issue raised.
- Consideration of the response. The Assessing Officer must consider the reply rather than treating the opportunity as a formality.
- Reasoned order with prior approval. The Department describes a reasoned decision made with the approval required under the Act.
- Notice under section 280. After that decision, the section 280 notice starts the reassessment stage to which the subsequent assessment deadline applies.
Section 281(4) contains exceptions under which the preliminary procedure can be dispensed with in specified circumstances. The Department says approval is still required in those cases. A taxpayer should therefore check whether a notice explains why the ordinary preliminary steps were omitted and which statutory exception is being relied on.
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How earlier-year reassessment under the 1961 Act is treated
For tax years beginning before 1 April 2026, the Department points to the old Act’s reassessment provisions, including sections 147, 148 and 148A. Its transition guidance says the 1961 Act continues to apply to pending proceedings and to proceedings initiated on or after 1 April 2026 when they concern an earlier tax year.
The old framework includes statutory limitation rules in section 149 and approval provisions in section 151 for notices under sections 148 and 148A. Those rules are not replaced merely because the notice is issued after 1 April 2026.
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Three different deadlines that taxpayers often confuse
A notice may involve several clocks. Identifying which clock is being discussed prevents a response deadline from being mistaken for the Department’s power to start a case.
1. The time limit to initiate or continue an old-Act case
For earlier tax years, section 149 supplies the limitation framework and section 151 supplies the relevant approval hierarchy. The period must be calculated against the specific year, notice and statutory facts. Because the applicable exceptions and calculations are not identical in every case, use the actual Act and notice rather than a universal online rule of thumb.
2. The time to file a return after an old-Act section 148 notice
When a section 148 notice requires a return, the Department says the return must be filed within the period specified in that notice, but that period cannot exceed three months from the end of the month in which the notice was issued. This is a deadline for the taxpayer’s response return. It is not the limitation period governing when the Department was allowed to begin reassessment.
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For the 2025 Act, the Department gives a general rule that an order under section 279 should be passed within one year from the end of the financial year in which the section 280 notice was served. The Department also notes that extensions and exclusions can apply. The date of the section 280 notice, rather than simply the date of the first communication, is therefore important when working out this completion period.
Does the 1 April 2026 transition date end old reassessment powers?
No. The transition guidance distinguishes the tax year from the date of the proceeding. Earlier-year matters remain under the 1961 Act in the circumstances identified by the Department, including pending matters and qualifying proceedings initiated on or after 1 April 2026. Old-Act rights and obligations can consequently continue after the new Act has taken effect.
Conversely, a notice issued after 1 April 2026 is not automatically governed by sections 279–286. If it concerns a tax year beginning before that date, the Department says the old Act applies. Read the year stated in the notice and the transition explanation together before assessing whether the cited section is appropriate.
What to check when a reopening notice arrives
Make a record of the notice before preparing a substantive response. These checks help identify the legal framework and any immediate deadline.
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- Tax year or assessment year: Confirm the year under review and whether it begins before 1 April 2026.
- Notice section: Identify whether the document cites an old-Act section 148 or 148A provision, or a 2025 Act provision such as section 280.
- Issue date and service date: Keep the original electronic or physical delivery record, because response and completion calculations may depend on service.
- Reasons or information described: Read the factual basis carefully. Note each transaction, income item, document or third-party information mentioned.
- Response deadline: Enter the date in a calendar immediately. For an old-Act section 148 return, compare the notice period with the Department’s three-month cap.
- Approval reference: Check whether the notice or accompanying record identifies the approval required under the applicable Act.
- Procedure used: Under the 2025 Act, see whether the show-cause and reply stage occurred or whether the Department invokes a section 281(4) exception.
- Scope: Separate issues actually described in the notice from unrelated matters you might volunteer. A response should address the stated basis accurately and completely.
How to respond without losing procedural rights
- Preserve the complete file. Save the notice, attachments, portal messages, email headers, delivery proof and any earlier assessment order or intimation.
- Build a year-specific timeline. List the original return, assessment or intimation, later communications, notice date and response deadline. This prevents dates from different tax years being mixed together.
- Reconcile the allegation to your records. Match each item in the notice with returns, books, bank statements, tax deduction certificates, invoices, contracts and prior submissions.
- Answer the stated information. Explain the facts in a point-by-point response. If an amount was already disclosed, identify where it appears and provide the supporting record. If the Department has confused two transactions or persons, show the correction clearly.
- Raise a timing or approval issue when supported by the documents. Do not rely on a generic statement that the case is too old. Apply the relevant old-Act limitation and approval provisions to the actual year and notice, or have a qualified adviser do so.
- File through the channel specified. Follow the notice’s electronic or other filing instructions and retain the acknowledgement, uploaded files and final submitted version.
- Seek a written extension only where necessary. If records cannot be obtained before the deadline, request additional time promptly and explain the specific documents sought. Do not assume that a request automatically extends the deadline.
- Continue monitoring the portal and correspondence. A response does not end the proceeding. Later requests, orders or notices may carry separate deadlines.
Common mistakes and why they matter
Assuming completion means permanent immunity
A completed assessment can be reopened through the statutory reassessment route. Treating the old order as an absolute bar can lead to a missed response date.
Using the notice date instead of the tax year
The 2025 Act does not govern every notice issued after 1 April 2026. Earlier tax years remain tied to the 1961 Act under the Department’s transition guidance.
Calling the three-month rule a look-back limit
The three-month cap concerns the return filed in response to an old-Act section 148 notice. It does not tell you how long the Department had to initiate reassessment.
Relying on a single internet deadline
Old-Act section 149 calculations and exceptions are year- and fact-sensitive. A fixed number of years quoted without identifying the relevant assessment year and statutory provision may produce the wrong answer.
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Ignoring the preliminary stage under the new Act
For a 2025 Act case, the ordinary process includes information, a show-cause notice, an opportunity to reply, consideration of that reply and a reasoned decision with approval before the section 280 notice. If an exception is invoked, the notice should be read for the statutory basis and approval.
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When professional advice is sensible
Consider consulting a chartered accountant or Indian tax lawyer when the notice concerns a large amount, several years, alleged undisclosed income, cross-border transactions, complex ownership, records you no longer possess or a possible limitation or approval defect. A professional can map the facts to the correct Act and calculate the applicable period instead of applying a generic deadline.
Professional assistance does not remove the need to protect the immediate response date. Submit a timely, accurate holding response or extension request where appropriate while the detailed review is under way, following the notice’s instructions.
Examples of how the year changes the analysis
Earlier tax year, notice issued after 1 April 2026
An assessment for a year beginning before 1 April 2026 is completed. A reassessment notice arrives in May 2026. The later issue date does not move the case automatically into sections 279–286. The old Act remains the starting framework, including its section 149 limitation and section 151 approval rules.
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For tax year 2026–27, the Department identifies information suggesting escaped income, gives a show-cause opportunity, considers the reply, obtains the required approval and serves a section 280 notice. The general completion period is then measured as one year from the end of the financial year in which that section 280 notice was served, subject to stated extensions and exclusions.
Old-Act section 148 return deadline
A section 148 notice specifies a period for filing a return. The Department’s guidance says the specified period cannot exceed three months from the end of the month in which the notice was issued. That date must be met even though the separate question of whether the Department began the case within the section 149 limitation period requires its own analysis.
Bottom line for a completed assessment
The Income Tax Department can reopen a completed assessment, but only through the reassessment framework that applies to the tax year and only subject to its statutory conditions, notices, approvals and time limits. For years beginning before 1 April 2026, examine the 1961 Act provisions and the transition rules. For tax year 2026–27 onward, examine sections 279–286, the information and show-cause process, any section 281(4) exception and the section 280 notice.
Do not infer validity or invalidity from age alone. Read the exact notice, preserve the service record, identify the response deadline and obtain year-specific advice where the amount or procedural issues are significant.
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