Imagine you filed your ITR, the AO processed it, and you thought it was done. Three years later, you get a notice saying "we think you hid some income." That's Section 147 in action — it gives the Assessing Officer (AO) the power to reopen a closed assessment if he has reason to believe that income has escaped assessment.
What triggers a reopening? The AO must have a genuine, tangible reason — not just suspicion. Income is treated as "escaped" in situations like: you never filed a return despite taxable income, you understated income or overclaimed deductions in your return, income was underassessed or taxed at a wrong rate, you failed to disclose a foreign asset, or you skipped the Section 92E report for international transactions. Explanation 2 lists all these cases explicitly — treat that list as exam-ready scenarios.
The critical time limits are where exams focus hard. If the AO has already done a scrutiny assessment (u/s 143(3)) or a previous reassessment, he can reopen only within 4 years from the end of the relevant assessment year — but only if the assessee failed to disclose fully and truly all material facts. Simply producing account books is NOT enough disclosure (Explanation 1 closes that loophole). However, the 4-year limit does NOT apply if the escaped income relates to a foreign asset — the AO gets unlimited time in that case. One more practical point: the AO can assess any escaped income that surfaces during reassessment proceedings, even if that issue wasn't in his original recorded reasons (Explanation 3) — so once a case is reopened, the AO has wide powers. The reassessment cannot cover income that is already the subject of an appeal or revision.
📊 Worked example
Example 1 — Basic reopening within time limit
Mr. Arjun Sharma filed his ITR for AY 2021-22 showing total income of ₹8,50,000. A scrutiny assessment u/s 143(3) was completed in December 2022. In November 2025, the AO receives information that Arjun received ₹3,20,000 in cash from a property deal which he never disclosed.
Working:
- Relevant AY: 2021-22
- End of relevant AY: 31 March 2022
- 4-year limit expires: 31 March 2026
- Date of proposed action: November 2025 → within 4 years ✓
- Did Arjun fail to disclose fully and truly? Yes — the ₹3,20,000 cash receipt was never disclosed
- Conclusion: AO can validly reopen under Section 147. Notice u/s 148 can be issued.
Example 2 — Foreign asset, no time bar
Ms. Priya Iyer filed her ITR for AY 2018-19 but did not disclose a savings account in Singapore with a balance equivalent to ₹45,00,000. The AO comes to know about this in March 2026.
Working:
- End of relevant AY 2018-19: 31 March 2019
- Normal 4-year window: closed by 31 March 2023
- But income relates to a foreign asset → Second proviso to Section 147 removes the 4-year restriction entirely
- Conclusion: AO can still reopen in March 2026. The time limit does not apply to foreign assets. Escaped income = ₹45,00,000 (or income arising from it). Notice u/s 148 is valid.
⚠️ Common exam mistakes
- Students confuse "reason to believe" with mere suspicion. Don't write in answers that the AO can reopen on any hunch — there must be tangible, recorded reasons. Vague information without application of mind is challengeable in court.
- Mixing up the time limits. Many students write "6 years" — that was the old law. Post-Finance Act 2021 changes, the general limit for cases with prior scrutiny is 4 years from end of AY (where non-disclosure is involved). Don't apply old limits in May 2026 exams.
- Thinking that producing account books = full disclosure. Explanation 1 explicitly says this is NOT necessarily sufficient. If the AO could have found the information with due diligence, the assessee doesn't get protection just by handing over books.
- Forgetting the foreign asset exception. Students apply the 4-year limit universally. Remember: if the escaped income relates to a foreign asset or financial interest in a foreign entity, the 4-year cap does not apply — this is a favourite exam twist.
- Assuming AO can only assess the originally suspected income. Explanation 3 makes clear that once reassessment is open, the AO can assess any escaped income that surfaces during proceedings — even issues not in the original recorded reasons. Don't restrict the AO's scope in your answers.
📖 Bare Act text — Section 147, Income Tax Act 1961
(click to expand)
If the Assessing Officer has reason to believe that any income chargeable to tax has escaped assessment for any assessment year, he may, subject to the provisions of sections 148 to 153, assess or reassess such income and also any other income chargeable to tax which has escaped assessment and which comes to his notice subsequently in the course of the proceedings under this section, or recompute the loss or the depreciation allowance or any other allowance, as the case may be, for the assessment year concerned (hereafter in this section and in sections 148 to 153 referred to as the relevant assessment year): Provided that where an assessment under sub-section (3) of section 143 or this section has been made for the relevant assessment year, no action shall be taken under this section after the expiry of four years from the end of the relevant assessment year, unless any income chargeable to tax has escaped assessment for such assessment year by reason of the failure on the part of the assessee to make a return under section 139 or in response to a notice issued undersub-section (1) of section 142 or section 148 or to disclose fully and truly all material facts necessary for his assessment, for that assessment year: Provided further that nothing contained in the first proviso shall apply in a case where any income in relation to any asset (including financial interest in any entity) located outside India, chargeable to tax, has escaped assessment for any assessment year: Provided also that the Assessing Officer may assess or reassess such income, other than theincome involving matters which are the subject matters of any appeal, reference or revision, which is chargeable to tax and has escaped assessment. Explanation 1.—Production before the Assessing Officer of account books or other evidence from which material evidence could with due diligence have been discovered by the Assessing Officer will not necessarily amount to disclosure within the meaning of the foregoing proviso. Explanation 2.—For the purposes of this section, the following shall also be deemed to be cases where income chargeable to tax has escaped assessment, namely:— (a) where no return of income has been furnished by the assessee although his total income or the total income of any other person in respect of which he is assessable under this Act during the previous year exceeded the maximum amount which is not chargeable to income-tax; (b) where a return of income has been furnished by the assessee but no assessment has been made and it is noticed by the Assessing Officer that the assessee has understated the income or has claimed excessive loss, deduction, allowance or relief in the return; (ba) where the assessee has failed to furnish a report in respect of any international transaction which he was so required under section 92E; (c) where an assessment has been made, but— (i) income chargeable to tax has been underassessed; or (ii) such income has been assessed at too low a rate; or (iii) such income has been made the subject of excessive relief under this Act ; or (iv) excessive loss or depreciation allowance or any other allowance under this Act has been computed; (ca) where a return of income has not been furnished by the assessee or a return of income has been furnished by him and on the basis of information or document received from the prescribed income-tax authority, under sub-section (2) of section 133C, it is noticed by the Assessing Officer that the income of the assessee exceeds the maximum amount not chargeable to tax, or as the case may be, the assessee has understated the income or has claimed excessive loss, deduction, allowance or relief in the return; (d) where a person is found to have any asset (including financial interest in any entity) located outside India. Explanation 3.—For the purpose of assessment or reassessment under this section, the Assessing Officer may assess or reassess the income in respect of any issue, which has escaped assessment, and such issue comes to his notice subsequently in the course of the proceedings under this section, notwithstanding that the reasons for such issue have not been included in the reasons recorded under sub-section (2) of section 148. Explanation 4.—For the removal of doubts, it is hereby clarified that the provisions of this section, as amended by the Finance Act, 2012 (23 of 2012), shall also be applicable for any assessment year beginning on or before the 1st day of April, 2012.
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