Section 148 Reassessment Notice: New 3 vs 10-Year Time Limits Post Finance Act 2021

A reassessment notice landing in your inbox years after you filed a return is one of the most unsettling communications the Income Tax Department sends. The Finance Act 2021, effective 1 April 2021, completely rewrote the reassessment machinery in Sections 147 to 151 of the Income-tax Act, 1961, replacing the old "reason to believe" regime with a tighter, information-driven procedure. The headline change: a normal outer limit of just 3 years from the end of the relevant assessment year, stretching to 10 years only where the escaped income crosses Rs 50 lakh. This Q&A walks through exactly when each limit applies and how to read the dates on your own notice.

The Scenario

Imagine Rohit, a salaried professional in Pune drawing Rs 18 lakh a year, who filed his return for assessment year (AY) 2022-23 on time and received his refund in 2022. In May 2026 he opens the income tax e-filing portal and finds a notice referencing Section 148. His first three questions are the universal ones: Is this notice even within time? What triggered it? And can the department reopen a four-year-old return at all? Under the post-2021 framework, the answer turns almost entirely on two numbers — the 3-year line and the Rs 50 lakh threshold that unlocks the 10-year window.

The stakes are real because a valid Section 148 notice forces a fresh assessment of the entire year, not just the disputed item, and any tax found due carries interest under Sections 234A, 234B and 234C from the original due dates. Before reacting, every recipient needs to confirm two things: whether the notice cleared the Section 148A pre-notice procedure, and whether it was issued before the statutory limitation date. You can stress-test the underlying tax exposure on Oquilia's income tax calculator once you know which year is being reopened.

Statutory Answer

Section 148 of the Income-tax Act, 1961 empowers the Assessing Officer (AO) to issue a notice where there is "information which suggests that income chargeable to tax has escaped assessment". The time limits for that notice live in Section 149, which the Finance Act 2021 reduced sharply from the earlier 6-year ceiling. There are now two limbs, and the date that matters is always the end of the relevant assessment year, not the date you filed.

The Rs 50 lakh figure is not a loose estimate. Section 149(1)(b) requires the AO to possess books of account, documents or evidence revealing that the escaped income, "represented in the form of an asset", is Rs 50 lakh or more for that year. A suspicion of Rs 10 lakh of unreported interest, for example, cannot support a notice issued in year four — that case shuts at the 3-year mark.

Equally important is Section 148A, inserted with effect from 1 April 2021, which builds a mandatory checkpoint before any Section 148 notice can issue. The AO must serve a show-cause notice under Section 148A(b) setting out the information relied on, give the assessee an opportunity of not less than 7 days (and not more than 30 days) to reply, consider that reply, and then pass a speaking order under Section 148A(d) with the prior approval of the specified authority under Section 151. Only after this order can the Section 148 notice itself be issued. The text of these provisions is reproduced in the consolidated bare act on indiacode.nic.in.

This procedural sequence is what the Supreme Court enforced in Union of India vs Ashish Agarwal, decided on 4 May 2022. Around 90,000 notices issued under the old Section 148 between 1 April and 30 June 2021 were challenged for ignoring the new 148A procedure. Using its powers under Article 142 of the Constitution, the Court directed that those notices be treated as show-cause notices under Section 148A(b), requiring the department to supply the underlying information and follow the new procedure uniformly across the country. The judgement confirmed that the post-2021 safeguards are not optional formalities.

Worked Resolution

Return to Rohit and his AY 2022-23 notice. The previous year (financial year) was 2021-22, so the relevant assessment year is 2022-23, and it ends on 31 March 2023. Every limitation date counts forward from that single anchor.

Two outcomes follow. If the department's information concerns, say, Rs 12 lakh of unreported professional fees, the only available limb is the 3-year one — and a notice physically issued in May 2026 is barred, because the window closed on 31 March 2026. Rohit can challenge it on limitation alone. But suppose the AO has evidence that Rohit sold an undisclosed flat and Rs 60 lakh of capital gains escaped assessment. Because the escaped income exceeds Rs 50 lakh and is represented in the form of an asset (immovable property), Section 149(1)(b) applies and the notice remains valid until 31 March 2033.

Now quantify the exposure on the Rs 60 lakh long-term capital gain. Under the Budget 2024 regime applicable from 23 July 2024, long-term capital gains on immovable property are taxed at 12.5% without indexation. A Rs 60 lakh gain therefore attracts roughly Rs 7.5 lakh of tax before cess, and a 4% health and education cess lifts the headline figure to about Rs 7.8 lakh, before interest under Sections 234A and 234B running from the FY 2021-22 due date. You can model the gain itself on Oquilia's capital gains calculator, and because reassessment reopens the whole year, it is worth re-running your slab position on the old vs new regime comparison to see how the added income shifts your effective rate. Reviewing your Form 26AS and the assessment year on the notice is the fastest way to confirm which year, and which limb, is in play.

The practical sequence for any recipient is therefore: first, read the assessment year on the notice and compute the two limitation dates; second, check whether a Section 148A(b) show-cause notice and a Section 148A(d) order preceded the Section 148 notice; third, verify whether the alleged escaped income actually clears Rs 50 lakh and is asset-backed if the notice falls in the 4-to-10-year band. Where any of these fails, the notice is vulnerable on jurisdiction or limitation, both of which courts have repeatedly accepted as fatal defects.

FAQ

Can a Section 148 notice for AY 2022-23 be issued in 2027?

Only under Section 149(1)(b). The 3-year window for AY 2022-23 closed on 31 March 2026, so a 2027 notice is valid only if the escaped income is Rs 50 lakh or more and represented as an asset, expenditure or entry, in which case the limit runs to 31 March 2033.

What is the difference between Section 148 and Section 148A?

Section 148A is the pre-notice procedure introduced on 1 April 2021: the AO must issue a show-cause notice, allow 7 to 30 days for a reply, and pass a reasoned order under Section 148A(d) with approval under Section 151. Section 148 is the actual reassessment notice that can be issued only after that order.

Does the Rs 50 lakh threshold apply per year or in aggregate?

Section 149(1)(b) tests the escaped income "for that year". The Rs 50 lakh has to be reached within a single relevant assessment year and be represented in the form of an asset, not summed across multiple years to manufacture jurisdiction for the 10-year window.

What did the Supreme Court decide in Ashish Agarwal?

In Union of India vs Ashish Agarwal (4 May 2022), the Court held that roughly 90,000 old-regime notices issued between 1 April and 30 June 2021 would be treated as Section 148A(b) show-cause notices, and directed the department to follow the new Finance Act 2021 procedure uniformly, including supplying the underlying information to assessees.

Will reassessment reopen my entire return or just one item?

A valid Section 148 notice reopens the whole assessment for that year. Even if the trigger was a single Rs 60 lakh capital gain, the AO can examine the full return, which is why re-checking your slab and deductions on the income tax calculator matters before you respond.

How much time do I get to reply to a Section 148A(b) notice?

Section 148A(b) requires the AO to allow not less than 7 days and not more than 30 days for your reply. Always reply within the stated window, attaching documentary evidence, because the AO must consider it before passing the Section 148A(d) order.

Does interest run from the original due date if reassessment adds tax?

Yes. Interest under Sections 234A and 234B is computed from the original due dates of FY 2021-22, not from the reassessment date, so a delayed notice can carry several years of accumulated interest even when the tax itself is modest.