Concessional regimes typically forfeit Chapter VI-A and most exemptions.
13. Refund / credit
MAT credit u/s 115JAA carries forward 15 years; AMT credit u/s 115JD.
14. Return / disclosure reporting
Form 10-IEA / 10-IC / 10-ID / 29B as applicable.
15. Penalty exposure
Wrong opt-in / opt-out — assessment proceedings; s. 270A applicability.
16. Prosecution exposure
Section 276C — wilful evasion (criminal).
17. Cross-statute interplay
International tax — DTAA Article 24 (non-discrimination) interplay.
18. Repeal & saving — 1961 → 2025
Section 536 saves opt-in elections; 2025 Act preserves special regimes.
HISTORICAL CONTEXT
Section 115BAC was originally inserted by the Finance Act, 2020 as an optional opt-in concessional regime for individuals and HUFs from AY 2021-22 onwards — offering lower slab rates in exchange for forfeiting most exemptions and Chapter VI-A deductions. The original framework had limited uptake.
The Finance Act, 2023 fundamentally restructured section 115BAC. Sub-section (1A) was inserted to make the new regime the DEFAULT for AY 2024-25 onwards, requiring affirmative opt-out via Form 10-IEA. Slab structure was revised (Rs 3 L threshold, 30% bracket from Rs 15 L), and the section 87A rebate was enhanced to Rs 25,000 (income up to Rs 7 L). The scope was widened to include AOP / BOI / artificial juridical persons.
The Finance Act, 2024 further enhanced section 115BAC: standard deduction increased to Rs 75,000 (from Rs 50,000) and section 16(ia) made applicable in new regime. The new regime is now distinctly more attractive for salary earners without significant Chapter VI-A deductions. Section 80CCD(2) employer NPS contribution, section 80CCH Agniveer fund, and section 80JJAA new-employment incentive remain available even in the new regime.
The transition to the Income-tax Act, 2025 preserves the special tax regime architecture; opt-in elections continue under section 536 saving.
FINANCE ACT AMENDMENT TIMELINE
■ FA 2020 — Section 115BAC inserted (optional opt-in regime, AY 2021-22+).
■ FA 2021 — Conforming amendments.
■ FA 2022 — Procedural updates.
■ FA 2023 — Section 115BAC(1A) — DEFAULT regime AY 2024-25+; revised slabs; rebate Rs 25K.
■ FA 2023 — Form 10-IEA introduced for opt-out.
■ FA 2024 — Standard deduction enhanced to Rs 75K in new regime; surcharge cap 25%.
■ FA 2025 — Further refinements.
■ ITA 2025 — Section 115BAC architecture preserved.
Facts. The Department sought to apply a surcharge provision retrospectively to block-period assessments. The assessee contended that the amendment was substantive and could not have retrospective operation absent express legislative direction.
Issue. Whether amendments to taxing statutes operate prospectively unless the legislature has expressly or by necessary implication conferred retrospective effect.
HELD. The Constitution Bench reaffirmed the general rule against retrospectivity of taxing statutes. A taxing provision must be construed prospectively unless the language compels otherwise; mere insertion or substitution by amendment is not sufficient to deny vested rights.
“Of the various rules guiding how a legislation has to be interpreted, one established rule is that unless a contrary intention appears, a legislation is presumed not to be intended to have a retrospective operation.”
Relevance. Anchor authority for any argument that an amendment to a charging or computational provision must apply only from the AY notified — useful in transitional disputes around FA 2025 and the 1961 → 2025 changeover.
▸ Mathuram Agrawal v. State of Madhya Pradesh (1999) 8 SCC 667 ; (2000) 1 SCR 1 (Supreme Court)
Facts. A municipal levy was challenged on the ground that the charging provision did not clearly specify the rate, the persons charged, and the measure of tax.
Issue. Whether a tax can be imposed in the absence of a clear, unambiguous charging provision identifying the subject, measure, rate, and incidence.
HELD. Article 265 demands that tax be levied only by clear authority of law. The four components — taxable event, person, rate, and measure — must be clearly discernible from the charging provision; ambiguity is fatal to the levy.
“The intention of the Legislature in a taxation statute is to be gathered from the language of the provisions, particularly when the language is plain and unambiguous. In a taxing Act it is not possible to assume any intention or governing purpose other than what is given expression to.”
Relevance. Foundational authority on the rigour required of charging sections — underpins arguments that ambiguous deeming fictions, surcharge formulas, and rate prescriptions must be strictly construed.
Facts. Section 52(2) (since deleted) deemed sale consideration to be FMV where FMV exceeded the declared consideration by 15%. The Department applied it on a literal reading even when the assessee had not in fact received more than the declared price.
Issue. Whether a deeming provision in a charging schema can be construed literally where its plain reading produces a result manifestly contrary to legislative object.
HELD. The Court read down section 52(2) to apply only where the assessee had actually received consideration in excess of the declared sum. A literal construction yielding absurd or unjust results must yield to an object-based interpretation; the CBDT's contemporaneous Circular No. 96 was held binding on the Revenue.
“It is well settled that a literal construction of a statutory provision ought not to be adopted if it produces a manifestly unjust result… Where a literal construction creates an anomaly, the courts will adopt that construction which avoids the anomaly.”
Relevance. Anchor authority for purposive construction of deeming fictions across the 1961 Act — applies wherever a deeming clause (e.g., s. 50C, s. 56(2)(x), s. 2(22)(e)) yields a result contrary to legislative purpose.
▸ Calcutta Discount Co. Ltd. v. Income-tax Officer, Companies District I, Calcutta (1961) 41 ITR 191 ; AIR 1961 SC 372 (Supreme Court — Constitution Bench)
Facts. The assessee challenged a section 34 reassessment notice on the ground that the ITO had no jurisdictional foundation to reopen; the Revenue contended that the writ jurisdiction was ousted by the statutory appeals scheme.
Issue. Whether the High Court's jurisdiction under Article 226 is ousted by the existence of a statutory remedy where the reassessment notice itself lacks jurisdictional foundation.
HELD. Existence of an alternative statutory remedy does not oust Article 226 jurisdiction where the impugned action is wholly without jurisdiction. The burden is on the assessee to disclose all primary facts; the duty to draw inferences rests with the assessing officer.
“The duty of the assessee in every case is to disclose fully and truly all primary facts. Once all primary facts are before the assessing authority, he requires no further assistance by way of disclosure.”
Relevance. Foundational on the boundary between assessee's disclosure duty and the ITO's investigative duty — supports challenges to s. 147/148 (1961) / s. 281 (2025) reassessments on jurisdictional grounds.
▸ Commissioner of Income-tax v. Reliance Petroproducts (P) Ltd. (2010) 322 ITR 158 ; (2010) 11 SCC 762 (Supreme Court)
Facts. The assessee claimed deduction of interest on borrowings used for investment in shares yielding tax-free dividend. The deduction was disallowed under section 14A. The Department levied penalty under section 271(1)(c) for concealment / inaccurate particulars.
Issue. Whether a mere disallowance of a deduction — without any falsehood in the particulars furnished — attracts penalty under section 271(1)(c).
HELD. Penalty under section 271(1)(c) is not attracted merely because a claim for deduction is disallowed. The assessee's claim must be shown to be false, frivolous, or made without bona fides; mere unsustainability does not amount to concealment or furnishing of inaccurate particulars.
“A mere making of the claim, which is not sustainable in law, by itself, will not amount to furnishing inaccurate particulars regarding the income of the assessee. Such claim made in the Return cannot amount to inaccurate particulars.”
Relevance. Cornerstone authority for resisting penalty under section 271(1)(c) / section 270A — applies to disallowed deductions, transfer-pricing adjustments, head-of-income re-characterisations where a bona-fide claim was made.
CBDT CIRCULARS — ECOSYSTEM
▸ CBDT Circular No. 14(XL-35) of 1955 dated 11 April 1955
Subject. Duty of officers to assist assessees in claiming and securing relief
Substance. Foundational circular directing that the AO should not exploit assessee ignorance to deny legitimate reliefs; officer is required to draw attention to refunds or reliefs to which the assessee is entitled. The circular has been judicially noted in several appellate decisions and remains operative for first-appellate practice.
Substance. Explained the FA 1987 / FA 1989 amendments unifying the previous year with the financial year preceding the AY, including transitional provisions for assessees with different accounting years. Useful in any controversy on the timing of accrual / chargeability for early post-1989 AYs.
▸ CBDT Circular No. 5 of 2014 dated 11 February 2014
Subject. Section 14A — dis-allowance even where no exempt income earned (since modulated)
Substance. Initially directed AOs to apply Rule 8D disallowance under section 14A even where no exempt income was earned in the year; subsequently modulated by Cheminvest (Del HC) and Maxopp (SC). FA 2022 amendment to section 14A re-asserted the position but remains under litigation.
▸ CBDT Circular No. 6 of 2019 dated 20 March 2019
Subject. Withdrawal of low-tax-effect appeals — monetary thresholds
Substance. Revised monetary thresholds for departmental appeals — ITAT (Rs 50L), HC (Rs 1 Cr), SC (Rs 2 Cr); subsequently further revised. Operates as a non-statutory limitation on the Revenue's appellate engagement, binding under section 119.
Substance. Procedural guidance for AOs handling transitional reassessment notices for AYs 2013-14 to 2017-18 affected by Ashish Agarwal and Rajeev Bansal. Sets out the form of section 148A inquiry, time-bar calculation under TOLA, and JAO/FAO jurisdiction in faceless cases.
WORKED EXAMPLES
Illustration — Illustration 1
Facts. Salaried individual A — gross salary Rs 12 L; no investments; no HRA.
Computation.
New regime (default): Rs 12 L - Rs 75K (std deduction) = Rs 11.25 L taxable.
Old regime would require Chapter VI-A investments to break even.
Result. New regime tax Rs 68,750 (no investment burden).
Illustration — Illustration 2
Facts. Self-employed business — net business income Rs 15 L; old regime PPF Rs 1.5 L + 80D Rs 25K.
Computation.
Old regime: Rs 15 L - Rs 1.75 L = Rs 13.25 L taxable; tax = ~Rs 2.1 L.
New regime: Rs 15 L taxable; tax = ~Rs 1.4 L.
New regime saves Rs 70K.
Must file Form 10-IEA to opt out of new regime; if eligible, business income gets once-for-all bind.
Result. New regime more beneficial here; once-for-all bind for business income.
Illustration — Illustration 3
Facts. Section 87A rebate eligibility — income Rs 6.9 L.
Computation.
New regime: Rs 6.9 L taxable; Section 87A rebate up to Rs 25,000 (income up to Rs 7 L).
Tax: 5%×(6.9-3) = Rs 19,500.
Rebate Rs 19,500 → zero tax.
Result. Marginal relief framework above Rs 7 L.
Illustration — Illustration 4
Facts. Senior citizen 65 yrs — pension Rs 8 L + bank interest Rs 1 L.
Computation.
New regime: Rs 9 L - Rs 75K (std) = Rs 8.25 L.
Tax = 5%×4 + 10%×1.25 = Rs 32,500.
Old regime: Rs 9 L - Rs 50K (std) - Rs 50K (80TTB) - say Rs 1.5L 80C = Rs 6.5 L taxable; tax = Rs 47,500 then less Rs 50K rebate (80TTB part of computation).
Comparable.
Result. Comparable; case-by-case computation.
Illustration — Illustration 5
Facts. HUF with rental income Rs 15 L + interest Rs 2 L.
Computation.
HUF eligible under s.
115BAC.
New regime: Rs 17 L taxable; tax = ~Rs 1.7 L.
No standard deduction for non-salary HUF income.
Old regime: 30% bracket from Rs 10 L; minimal Chapter VI-A — new regime saves.
Result. New regime saves for HUF rental income.
PRACTITIONER PLANNING NOTES
■ Annual regime-choice modelling — old vs new regime tax computation.
■ Section 115BAC default (FA 2023) — opt-out via Form 10-IEA for business income; once-and-for-all for some categories.
■ Section 115BAA — once-and-for-all opt-in for corporates; forfeits MAT applicability.
■ Section 115BAB — new manufacturing (incorporated 1-Oct-2019+, commenced 31-Mar-2024+).
■ Section 115JB — MAT 15% on book profits; MAT credit u/s 115JAA 15-year carry-forward.
▸ Section 536 — ITA 2025Saves opt-in / opt-out elections.
FA 2026 AMENDMENT — COMMENTARY
Finance Act 2026: Section 115BAC — Default new regime for individuals / HUFs PRESERVED by FA 2026 without slab structure change. Rs 75K standard deduction (FA 2024) preserved. Section 87A rebate framework preserved. Option to opt-out under s. 115BAC(6) continues for non-business / non-professional income taxpayers.
Effective: AY 2026-27
Category: Special Tax Regime
Practitioner Commentary:
FA 2026 preserves the default-regime slab structure. Practitioner advisory — comparative analysis between default new regime and old regime continues per FA 2023 / 2024 framework. Most non-deduction-heavy taxpayers find new regime advantageous; old regime preferred for taxpayers with substantial 80C / HRA / home-loan-interest deductions.
Source: Finance Act 2026 (no material change to slab structure).
Case Laws & Commentary
SECTION 115BAC — TAX ON INCOME OF INDIVIDUALS, HINDU UNDIVIDED FAMILY AND OTHERS
Case Laws & Commentary (Income-tax Act, 1961 as amended by Finance Act, 2026)
A. SECTION COMMENTARY
A.1 Structural position & legislative purpose
Section 115BAC is the new personal-tax regime. Introduced by the Finance Act, 2020 (w.e.f. AY 2021-22) as an optional concessional-slab regime for individuals and HUFs who forgo most exemptions and deductions, it was fundamentally recast by the Finance Act, 2023 (w.e.f. AY 2024-25) into the default regime for individuals, HUFs, associations of persons (other than co-operative societies), bodies of individuals and artificial juridical persons, with revised slabs, a standard deduction, an enhanced section 87A rebate and a reduced surcharge cap. A taxpayer is now taxed under section 115BAC unless he opts out into the old regime; for those with business or professional income the opt-out is exercised through Form 10-IEA and is subject to the once-in-a-lifetime switching restriction, while a taxpayer without business income may choose afresh each year.
The policy is to move the personal-tax base to a lower-rate, fewer-exemptions structure by default, simplifying compliance while withdrawing the bulk of Chapter VI-A deductions (other than the limited carve-outs such as the employer's NPS contribution under section 80CCD(2) and section 80JJAA) and several exemptions and the additional/accelerated depreciation for the business class.
A.2 Sub-section / clause taxonomy
Sub-section (1A) (the default regime, FA 2023): concessional slabs for individuals/HUF/AOP/BOI/AJP for AY 2024-25 onward, with the standard deduction and the enhanced section 87A rebate. Conditions: total income computed without the specified exemptions/deductions and without set-off of related losses and additional depreciation. Sub-section providing the opt-out: a person may exercise the option to be taxed under the old regime; for a person with business/professional income the opt-out (and any one-time switch back) is through Form 10-IEA by the return due date, whereas a person without business income may opt out each year in the return.
A.3 Core doctrinal themes
Theme (1) - Default, not optional, from AY 2024-25: the burden has reversed - section 115BAC applies automatically unless the taxpayer affirmatively opts out; the older 'opt-in' framing (AY 2021-22 to 2023-24) is superseded.
Theme (2) - Asymmetric switching: a taxpayer without business income chooses regime annually; a taxpayer with business income who opts out can switch back to the new regime only once, after which the new regime is final (the Form 10-IEA discipline).
Theme (3) - Exemptions/deductions forgone with limited carve-outs: most Chapter VI-A deductions and several exemptions are unavailable, but the standard deduction, employer's NPS under section 80CCD(2), section 80JJAA and a few others survive; the enhanced section 87A rebate makes the regime tax-free up to the prescribed threshold.
Inserted by the Finance Act, 2020 (optional, AY 2021-22). Recast as the default regime by the Finance Act, 2023 (AY 2024-25), with new slabs, standard deduction, enhanced section 87A rebate (making income up to Rs.7,00,000 effectively tax-free under the regime) and a reduced top surcharge of 25%. The Finance Act, 2025 further revised the slab structure and raised the section 87A rebate threshold for the regime (the special-rate-income limitation on the 87A rebate being an FA 2025 feature).
Finance Act 2026: section 115BAC (the default new regime for individuals/HUF and others) is PRESERVED. As recorded in the firm's FA 2026 Amendment Tracker (item 28), the default new regime is continued and its slab structure preserved; income-tax rates for Tax Year 2026-27 are unchanged from the preceding year (Tracker, Tax Rates item).
A.5 CA practitioner pointers
(1) Treat the new regime as the default - a taxpayer who wants the old regime must affirmatively opt out (Form 10-IEA where there is business/professional income). (2) For salaried/non-business clients, run the annual old-vs-new comparison; the choice is available each year. (3) For business clients, advise carefully before opting out - the switch back to the new regime is available only once. (4) Map which deductions survive (standard deduction, 80CCD(2), 80JJAA) and which are lost; recompute losses/depreciation under the regime's restrictions. (5) Apply the enhanced section 87A rebate, noting the FA 2025 limitation of the rebate against certain special-rate incomes.
B. FINANCE ACT, 2026 - IMPACT NOTE
Section 115BAC is PRESERVED by the Finance Act, 2026, and is the live default personal-tax regime for AY 2026-27 onward. The FA 2026 Amendment Tracker records (item 28) that the default new regime for individuals/HUFs is continued with its slab structure preserved, and (Tax Rates item) that income-tax rates for Tax Year 2026-27 are unchanged from the previous year. FA 2026 makes no structural change to the regime; the asymmetric switching rules and the standard deduction/87A rebate carry forward.
C. CASE LAW - CLUSTERED BY ISSUE
Cluster C-1 : Opt-out timing and the Form 10-IE/10-IEA discipline
Form 10-IE / Form 10-IEA timeliness (cognate to the company Form 10-IC condonation line).
Principle: The regime choice for a taxpayer with business/professional income must be exercised through the prescribed form by the return due date. In the cognate company context (Form 10-IC under section 115BAA), the CBDT and the Tribunals have treated a delayed procedural filing as condonable/directory where the substantive choice was clearly made in the return; the same substance-over-form approach has been applied to the personal-regime forms, with delayed or omitted Form 10-IE filings being condoned where the option was evident from the return.
Relevance: Fixes the principal compliance risk under section 115BAC for business taxpayers and supplies the relief route for a late or omitted regime-election form, by analogy to the developed condonation jurisprudence.
Candid note on the case-law field: Section 115BAC is recent and, as the default regime, only from AY 2024-25; a settled body of binding appellate authority dedicated to it is still developing, and most disputes are procedural (form timeliness) or computational (which deductions survive). The position is stated candidly; the governing analogy is the Form 10-IC/10-IE condonation line, and no decision has been invented under section 115BAC.
D. PRACTITIONER'S NOTE
Section 115BAC is now the spine of personal taxation: default unless opted out. For non-business clients, the annual old-vs-new comparison drives the return; for business clients, the Form 10-IEA opt-out and the once-only switch-back demand a considered, documented decision. The compliance risk is form timing (relievable by the condonation jurisprudence), and the computational risk is mis-mapping the surviving deductions and the loss/depreciation restrictions. FA 2026 preserves the regime unchanged for AY 2026-27.
E. SOURCES & CITATIONS
Statutory text verified against the Income-tax Act, 1961 (Bare Act, as amended by the Finance Act, 2025), Chapter XII section 115BAC (inserted by the Finance Act, 2020; recast as default regime by the Finance Act, 2023; slabs/87A revised by the Finance Act, 2025); cross-checked for FA 2026 against the firm's '00 Finance Act 2026 Amendment Tracker.xlsx' (item 28: default new regime preserved; Tax Rates item: TY 2026-27 rates unchanged). Marginal heading reproduced verbatim: 'Tax on income of individuals, Hindu undivided family and others.'
Procedural propositions are read with the Form 10-IE/10-IEA framework and the cognate Form 10-IC condonation jurisprudence (CBDT Circular No. 6/2022 and successors; see the section 115BAA file). Given the recency of the default regime, the developing case-law field is stated candidly rather than supported by off-point citations.
Caveat: Treatise-style commentary for practitioners and academic use; not legal opinion. Slabs, the standard deduction, the section 87A rebate threshold and its limitation against special-rate incomes are revised frequently by the annual Finance Acts; verify the current statutory text, the applicable slabs/rebate and the latest CBDT/appellate position before relying on any proposition.
STATUTORY ARCHITECTURE — 18-ROW MAP
01. Section & marginal note
Section 115BAC — New Tax Regime (Individuals / HUF / AOP / BOI / AJP) — Chapter XII (Special Tax Regimes).
02. Sub-section structure
Per operative text — typically rate + conditions + carve-outs / forfeitures.
03. Operative trigger
Opt-in / default election; satisfaction of eligibility conditions.
04. Persons affected
Per section — individual / HUF / firm / company / co-op.
05. Time anchor — PY / AY
Annual election (some regimes) or once-for-all (others).
06. Income anchor
Total income / book profit / undisclosed income — section-specific.
07. Residential-status nexus
Generally for resident assessees; NR with specified concessions.
08. Rate / charge mechanism
Special rate — 22% / 15% / 60% / 15% MAT / new-regime slabs.
09. TDS / TCS interaction
TDS at applicable rate; regime choice does not affect TDS rate.
10. Advance-tax obligation
Advance tax payable per regime; s. 234C interest on instalment shortfall.
11. Presumptive provisions
Interaction with s. 44AD / 44ADA / 44AE.
12. Exemption / deduction mechanism
Concessional regimes typically forfeit Chapter VI-A and most exemptions.
13. Refund / credit
MAT credit u/s 115JAA carries forward 15 years; AMT credit u/s 115JD.
14. Return / disclosure reporting
Form 10-IEA / 10-IC / 10-ID / 29B as applicable.
15. Penalty exposure
Wrong opt-in / opt-out — assessment proceedings; s. 270A applicability.
16. Prosecution exposure
Section 276C — wilful evasion (criminal).
17. Cross-statute interplay
International tax — DTAA Article 24 (non-discrimination) interplay.
18. Repeal & saving — 1961 → 2025
Section 536 saves opt-in elections; 2025 Act preserves special regimes.
HISTORICAL CONTEXT
Section 115BAC was originally inserted by the Finance Act, 2020 as an optional opt-in concessional regime for individuals and HUFs from AY 2021-22 onwards — offering lower slab rates in exchange for forfeiting most exemptions and Chapter VI-A deductions. The original framework had limited uptake.
The Finance Act, 2023 fundamentally restructured section 115BAC. Sub-section (1A) was inserted to make the new regime the DEFAULT for AY 2024-25 onwards, requiring affirmative opt-out via Form 10-IEA. Slab structure was revised (Rs 3 L threshold, 30% bracket from Rs 15 L), and the section 87A rebate was enhanced to Rs 25,000 (income up to Rs 7 L). The scope was widened to include AOP / BOI / artificial juridical persons.
The Finance Act, 2024 further enhanced section 115BAC: standard deduction increased to Rs 75,000 (from Rs 50,000) and section 16(ia) made applicable in new regime. The new regime is now distinctly more attractive for salary earners without significant Chapter VI-A deductions. Section 80CCD(2) employer NPS contribution, section 80CCH Agniveer fund, and section 80JJAA new-employment incentive remain available even in the new regime.
The transition to the Income-tax Act, 2025 preserves the special tax regime architecture; opt-in elections continue under section 536 saving.
FINANCE ACT AMENDMENT TIMELINE
■ FA 2020 — Section 115BAC inserted (optional opt-in regime, AY 2021-22+).
■ FA 2021 — Conforming amendments.
■ FA 2022 — Procedural updates.
■ FA 2023 — Section 115BAC(1A) — DEFAULT regime AY 2024-25+; revised slabs; rebate Rs 25K.
■ FA 2023 — Form 10-IEA introduced for opt-out.
■ FA 2024 — Standard deduction enhanced to Rs 75K in new regime; surcharge cap 25%.
■ FA 2025 — Further refinements.
■ ITA 2025 — Section 115BAC architecture preserved.
JUDICIAL EVOLUTION — VERIFIED LANDMARK AUTHORITIES
▸ Commissioner of Income-tax v. Vatika Township Pvt. Ltd. (2014) 367 ITR 466 ; (2015) 1 SCC 1 (Supreme Court — 5-Judge Constitution Bench)
Facts. The Department sought to apply a surcharge provision retrospectively to block-period assessments. The assessee contended that the amendment was substantive and could not have retrospective operation absent express legislative direction.
Issue. Whether amendments to taxing statutes operate prospectively unless the legislature has expressly or by necessary implication conferred retrospective effect.
HELD. The Constitution Bench reaffirmed the general rule against retrospectivity of taxing statutes. A taxing provision must be construed prospectively unless the language compels otherwise; mere insertion or substitution by amendment is not sufficient to deny vested rights.
“Of the various rules guiding how a legislation has to be interpreted, one established rule is that unless a contrary intention appears, a legislation is presumed not to be intended to have a retrospective operation.”
Relevance. Anchor authority for any argument that an amendment to a charging or computational provision must apply only from the AY notified — useful in transitional disputes around FA 2025 and the 1961 → 2025 changeover.
▸ Mathuram Agrawal v. State of Madhya Pradesh (1999) 8 SCC 667 ; (2000) 1 SCR 1 (Supreme Court)
Facts. A municipal levy was challenged on the ground that the charging provision did not clearly specify the rate, the persons charged, and the measure of tax.
Issue. Whether a tax can be imposed in the absence of a clear, unambiguous charging provision identifying the subject, measure, rate, and incidence.
HELD. Article 265 demands that tax be levied only by clear authority of law. The four components — taxable event, person, rate, and measure — must be clearly discernible from the charging provision; ambiguity is fatal to the levy.
“The intention of the Legislature in a taxation statute is to be gathered from the language of the provisions, particularly when the language is plain and unambiguous. In a taxing Act it is not possible to assume any intention or governing purpose other than what is given expression to.”
Relevance. Foundational authority on the rigour required of charging sections — underpins arguments that ambiguous deeming fictions, surcharge formulas, and rate prescriptions must be strictly construed.
▸ K.P. Varghese v. Income-tax Officer, Ernakulam (1981) 131 ITR 597 ; (1981) 4 SCC 173 (Supreme Court — 3-Judge Bench)
Facts. Section 52(2) (since deleted) deemed sale consideration to be FMV where FMV exceeded the declared consideration by 15%. The Department applied it on a literal reading even when the assessee had not in fact received more than the declared price.
Issue. Whether a deeming provision in a charging schema can be construed literally where its plain reading produces a result manifestly contrary to legislative object.
HELD. The Court read down section 52(2) to apply only where the assessee had actually received consideration in excess of the declared sum. A literal construction yielding absurd or unjust results must yield to an object-based interpretation; the CBDT's contemporaneous Circular No. 96 was held binding on the Revenue.
“It is well settled that a literal construction of a statutory provision ought not to be adopted if it produces a manifestly unjust result… Where a literal construction creates an anomaly, the courts will adopt that construction which avoids the anomaly.”
Relevance. Anchor authority for purposive construction of deeming fictions across the 1961 Act — applies wherever a deeming clause (e.g., s. 50C, s. 56(2)(x), s. 2(22)(e)) yields a result contrary to legislative purpose.
▸ Calcutta Discount Co. Ltd. v. Income-tax Officer, Companies District I, Calcutta (1961) 41 ITR 191 ; AIR 1961 SC 372 (Supreme Court — Constitution Bench)
Facts. The assessee challenged a section 34 reassessment notice on the ground that the ITO had no jurisdictional foundation to reopen; the Revenue contended that the writ jurisdiction was ousted by the statutory appeals scheme.
Issue. Whether the High Court's jurisdiction under Article 226 is ousted by the existence of a statutory remedy where the reassessment notice itself lacks jurisdictional foundation.
HELD. Existence of an alternative statutory remedy does not oust Article 226 jurisdiction where the impugned action is wholly without jurisdiction. The burden is on the assessee to disclose all primary facts; the duty to draw inferences rests with the assessing officer.
“The duty of the assessee in every case is to disclose fully and truly all primary facts. Once all primary facts are before the assessing authority, he requires no further assistance by way of disclosure.”
Relevance. Foundational on the boundary between assessee's disclosure duty and the ITO's investigative duty — supports challenges to s. 147/148 (1961) / s. 281 (2025) reassessments on jurisdictional grounds.
▸ Commissioner of Income-tax v. Reliance Petroproducts (P) Ltd. (2010) 322 ITR 158 ; (2010) 11 SCC 762 (Supreme Court)
Facts. The assessee claimed deduction of interest on borrowings used for investment in shares yielding tax-free dividend. The deduction was disallowed under section 14A. The Department levied penalty under section 271(1)(c) for concealment / inaccurate particulars.
Issue. Whether a mere disallowance of a deduction — without any falsehood in the particulars furnished — attracts penalty under section 271(1)(c).
HELD. Penalty under section 271(1)(c) is not attracted merely because a claim for deduction is disallowed. The assessee's claim must be shown to be false, frivolous, or made without bona fides; mere unsustainability does not amount to concealment or furnishing of inaccurate particulars.
“A mere making of the claim, which is not sustainable in law, by itself, will not amount to furnishing inaccurate particulars regarding the income of the assessee. Such claim made in the Return cannot amount to inaccurate particulars.”
Relevance. Cornerstone authority for resisting penalty under section 271(1)(c) / section 270A — applies to disallowed deductions, transfer-pricing adjustments, head-of-income re-characterisations where a bona-fide claim was made.
CBDT CIRCULARS — ECOSYSTEM
▸ CBDT Circular No. 14(XL-35) of 1955 dated 11 April 1955
Subject. Duty of officers to assist assessees in claiming and securing relief
Substance. Foundational circular directing that the AO should not exploit assessee ignorance to deny legitimate reliefs; officer is required to draw attention to refunds or reliefs to which the assessee is entitled. The circular has been judicially noted in several appellate decisions and remains operative for first-appellate practice.
▸ CBDT Circular No. 549 dated 31 October 1989
Subject. Explanatory notes — Finance Act 1989 amendments (incl. PY unification)
Substance. Explained the FA 1987 / FA 1989 amendments unifying the previous year with the financial year preceding the AY, including transitional provisions for assessees with different accounting years. Useful in any controversy on the timing of accrual / chargeability for early post-1989 AYs.
▸ CBDT Circular No. 5 of 2014 dated 11 February 2014
Subject. Section 14A — dis-allowance even where no exempt income earned (since modulated)
Substance. Initially directed AOs to apply Rule 8D disallowance under section 14A even where no exempt income was earned in the year; subsequently modulated by Cheminvest (Del HC) and Maxopp (SC). FA 2022 amendment to section 14A re-asserted the position but remains under litigation.
▸ CBDT Circular No. 6 of 2019 dated 20 March 2019
Subject. Withdrawal of low-tax-effect appeals — monetary thresholds
Substance. Revised monetary thresholds for departmental appeals — ITAT (Rs 50L), HC (Rs 1 Cr), SC (Rs 2 Cr); subsequently further revised. Operates as a non-statutory limitation on the Revenue's appellate engagement, binding under section 119.
▸ CBDT Circular No. 5 of 2024 dated 15 March 2024
Subject. Procedure for transitional reassessment notices post-Ashish Agarwal / Rajeev Bansal
Substance. Procedural guidance for AOs handling transitional reassessment notices for AYs 2013-14 to 2017-18 affected by Ashish Agarwal and Rajeev Bansal. Sets out the form of section 148A inquiry, time-bar calculation under TOLA, and JAO/FAO jurisdiction in faceless cases.
WORKED EXAMPLES
Illustration — Illustration 1
Facts. Salaried individual A — gross salary Rs 12 L; no investments; no HRA.
Computation.
New regime (default): Rs 12 L - Rs 75K (std deduction) = Rs 11.25 L taxable.
Tax: 5%×(7-3) + 10%×(10-7) + 15%×(11.25-10) = 20K + 30K + 18.75K = Rs 68,750.
Old regime would require Chapter VI-A investments to break even.
Result. New regime tax Rs 68,750 (no investment burden).
Illustration — Illustration 2
Facts. Self-employed business — net business income Rs 15 L; old regime PPF Rs 1.5 L + 80D Rs 25K.
Computation.
Old regime: Rs 15 L - Rs 1.75 L = Rs 13.25 L taxable; tax = ~Rs 2.1 L.
New regime: Rs 15 L taxable; tax = ~Rs 1.4 L.
New regime saves Rs 70K.
Must file Form 10-IEA to opt out of new regime; if eligible, business income gets once-for-all bind.
Result. New regime more beneficial here; once-for-all bind for business income.
Illustration — Illustration 3
Facts. Section 87A rebate eligibility — income Rs 6.9 L.
Computation.
New regime: Rs 6.9 L taxable; Section 87A rebate up to Rs 25,000 (income up to Rs 7 L).
Tax: 5%×(6.9-3) = Rs 19,500.
Rebate Rs 19,500 → zero tax.
Result. Marginal relief framework above Rs 7 L.
Illustration — Illustration 4
Facts. Senior citizen 65 yrs — pension Rs 8 L + bank interest Rs 1 L.
Computation.
New regime: Rs 9 L - Rs 75K (std) = Rs 8.25 L.
Tax = 5%×4 + 10%×1.25 = Rs 32,500.
Old regime: Rs 9 L - Rs 50K (std) - Rs 50K (80TTB) - say Rs 1.5L 80C = Rs 6.5 L taxable; tax = Rs 47,500 then less Rs 50K rebate (80TTB part of computation).
Comparable.
Result. Comparable; case-by-case computation.
Illustration — Illustration 5
Facts. HUF with rental income Rs 15 L + interest Rs 2 L.
Computation.
HUF eligible under s.
115BAC.
New regime: Rs 17 L taxable; tax = ~Rs 1.7 L.
No standard deduction for non-salary HUF income.
Old regime: 30% bracket from Rs 10 L; minimal Chapter VI-A — new regime saves.
Result. New regime saves for HUF rental income.
PRACTITIONER PLANNING NOTES
■ Annual regime-choice modelling — old vs new regime tax computation.
■ Section 115BAC default (FA 2023) — opt-out via Form 10-IEA for business income; once-and-for-all for some categories.
■ Section 115BAA — once-and-for-all opt-in for corporates; forfeits MAT applicability.
■ Section 115BAB — new manufacturing (incorporated 1-Oct-2019+, commenced 31-Mar-2024+).
■ Section 115JB — MAT 15% on book profits; MAT credit u/s 115JAA 15-year carry-forward.
■ Section 115BBE — 60% + 25% surcharge ~ 78% effective on cash credits.
■ Concessional regime forfeitures — Chapter VI-A (except 80JJAA / 80CCD(2)), losses brought forward, additional depreciation.
■ Form 10-IC / 10-ID timing — within return-filing due date u/s 139(1) — strict.
■ Section 87A rebate — varies between regimes (Rs 12,500 vs Rs 25,000 for new regime FY 2023-24 onwards).
■ Section 80CCD(2) employer NPS — available even in new regime.
■ Section 80JJAA new-employment incentive — available even in 115BAA/BAB.
■ Standard deduction Rs 50K / Rs 75K (new regime FA 2024 onwards) — available in new regime.
■ Surcharge structure — capped at 25% under new regime (FA 2023) vs 37% under old.
■ MAT-credit utilisation strategy — interplay with regime-choice.
■ Documentation 7 years — supporting opt-in / opt-out elections and computation basis.
LITIGATION DEFENCE
■ Vatika Township — prospective amendment for new regime substantive provisions.
■ Mathuram Agrawal — strict construction of charging / concessional provisions.
■ K.P. Varghese — object-and-purpose interpretation.
■ Calcutta Discount — Article 226 writ where statutory remedy not efficacious.
■ Hindustan Coca-Cola anchor — no double counting / recovery.
■ Section 273B reasonable-cause defence for procedural lapses (regime opt-in form delays).
■ Reliance Petroproducts — bona-fide claim disclosed in return.
■ Dilip N. Shroff — penalty discretion.
■ Strict-construction defence — concessional regime conditions are mandatory; substantial compliance debate.
■ Constitutional grounds — Article 14 / 19 / 265 in extreme arbitrariness cases.
■ Form 10-IC / 10-ID late filing — Hexaware-type bona-fide defence; ITAT cases (Trishna Industries / Ekta Diamonds).
■ MAT credit denial — Apollo Tyres SC anchor for MAT computation principles.
■ Section 115JB book-profit additions — Tata Sky / Bombay HC framework on net profit starting point.
■ Section 234B / 234C interest on retrospective regime-switching — defence grounds.
■ Bona-fide TDS deduction — reasonable-cause defence under s. 273B for non-corporate AMT cases.
■ Constitutional non-discrimination — DTAA Article 24 in NR-related disputes.
STEP-BY-STEP PROCEDURE — 15 STEPS
Step 1. Eligibility assessment
Confirm assessee qualifies for the regime under section's conditions.
Step 2. Tax modelling — old vs new
Comparative computation under both regimes for the relevant FY.
Step 3. Carve-outs and forfeitures check
Identify Chapter VI-A / loss / MAT forfeitures under concessional regime.
Step 4. Once-for-all vs annual choice
Determine whether regime choice is annual (s. 115BAC) or permanent (s. 115BAA/BAB).
Step 5. Form 10-IEA / 10-IC / 10-ID filing
Within return-filing due date u/s 139(1); EVC / DSC verified.
Step 6. Advance tax instalment computation
Adjust advance tax per chosen regime; s. 234C interest awareness.
Step 7. MAT / AMT computation
Section 115JB MAT for corporates; s. 115JC AMT for non-corporates.
Step 8. Section 87A rebate optimisation
Apply regime-specific rebate (FA 2023+ for s. 115BAC).
Step 9. Surcharge cap awareness
New regime surcharge capped at 25% (s. 115BAC); MMR for AOP/BOI.
Step 10. TDS reconciliation per regime
Adjust salary TDS per new-regime declaration (Form 12BB / 16).
Step 11. Return filing per regime
ITR with regime-specific schedules and computation.
Step 12. MAT credit claim u/s 115JAA
If applicable — claim credit and carry-forward for 15 years.
Step 13. Section 80JJAA / 80CCD(2)
Available even under concessional regime.
Step 14. Documentation
Preserve Form 10-IEA / 10-IC / 10-ID + tax-comparison workings 7 years.
Step 15. Regime-switch monitoring
Annual review for s. 115BAC; track once-for-all status for s. 115BAA / BAB.
PRACTITIONER CHECKLIST — 19 ITEMS
PRACTITIONER CHECKLIST
☐ Eligibility under section's conditions confirmed.
☐ Comparative tax modelling — old vs new regime — workings preserved.
☐ Form 10-IEA / 10-IC / 10-ID filed within due date u/s 139(1).
☐ Carve-out / forfeiture impact computed (Chapter VI-A / losses / MAT).
☐ Advance tax instalments per chosen regime.
☐ Section 234B / 234C interest worked out.
☐ MAT / AMT computation if applicable.
☐ Section 87A rebate per regime applied.
☐ Surcharge cap (25%) applied for s. 115BAC where applicable.
☐ Salary TDS adjustment per regime declaration.
☐ ITR with regime-specific schedules filed.
☐ MAT credit u/s 115JAA tracked.
☐ Section 80JJAA / 80CCD(2) availability checked.
☐ Standard deduction Rs 50K / Rs 75K applied.
☐ Section 115JB Form 29B (MAT certificate) — for corporates.
☐ Regime-switch register maintained (especially s. 115BAC annual).
☐ Schedule II FA Act rates verified.
☐ DTAA non-discrimination considerations (NR cases).
☐ Documentation 7 years — full regime-choice file preserved.
CROSS-REFERENCES (28+)
CROSS-REFERENCES
▸ Section 87ARebate framework (Rs 25K in new regime).
▸ Section 16(ia)Standard deduction Rs 75K in new regime (FA 2024+).
▸ Section 80CCD(2)Employer NPS — available even in new regime.
▸ Section 80CCHAgniveer fund — available in new regime.
▸ Section 80JJAANew employment — available in new regime.
▸ Chapter VI-A (other)Forfeited under new regime.
▸ Section 10(13A)HRA exemption — forfeited.
▸ Section 10(14)LTC / other allowances — forfeited.
▸ Section 24(b)Self-occupied HP interest — forfeited.
▸ Section 32(1)(iia)Additional depreciation — forfeited.
▸ Section 57(iia)Family pension deduction — preserved.
▸ Section 10AASEZ — forfeited.
▸ Section 35ADSpecified business — forfeited.
▸ Form 10-IEAOpt-out / re-entry form.
▸ Section 139(1)Due date for Form 10-IEA.
▸ Section 234A / 234B / 234CInterest on advance tax.
▸ Section 115JCAMT — limited applicability post-FA 2023 in new regime.
▸ Section 115BBEPenal rate — independent of regime.
▸ Section 270APenalty framework — independent.
▸ Section 144BFaceless overlay.
▸ Section 246AAppeal route.
▸ Schedule II — FA ActSlab rates source.
▸ Section 246AAppeal route.
▸ Vatika Township (SC)Prospective amendment principle.
▸ Mathuram Agrawal (SC)Strict construction.
▸ Article 14 / 265 — ConstitutionConstitutional safeguards.
▸ DTAA Article 24Non-discrimination — NR aspect.
▸ Section 536 — ITA 2025Saves opt-in / opt-out elections.
FA 2026 AMENDMENT — COMMENTARY
Finance Act 2026: Section 115BAC — Default new regime for individuals / HUFs PRESERVED by FA 2026 without slab structure change. Rs 75K standard deduction (FA 2024) preserved. Section 87A rebate framework preserved. Option to opt-out under s. 115BAC(6) continues for non-business / non-professional income taxpayers.
Effective: AY 2026-27
Category: Special Tax Regime
Practitioner Commentary:
FA 2026 preserves the default-regime slab structure. Practitioner advisory — comparative analysis between default new regime and old regime continues per FA 2023 / 2024 framework. Most non-deduction-heavy taxpayers find new regime advantageous; old regime preferred for taxpayers with substantial 80C / HRA / home-loan-interest deductions.
Source: Finance Act 2026 (no material change to slab structure).
Case Laws & Commentary
SECTION 115BAC — TAX ON INCOME OF INDIVIDUALS, HINDU UNDIVIDED FAMILY AND OTHERS
Case Laws & Commentary (Income-tax Act, 1961 as amended by Finance Act, 2026)
A. SECTION COMMENTARY
A.1 Structural position & legislative purpose
Section 115BAC is the new personal-tax regime. Introduced by the Finance Act, 2020 (w.e.f. AY 2021-22) as an optional concessional-slab regime for individuals and HUFs who forgo most exemptions and deductions, it was fundamentally recast by the Finance Act, 2023 (w.e.f. AY 2024-25) into the default regime for individuals, HUFs, associations of persons (other than co-operative societies), bodies of individuals and artificial juridical persons, with revised slabs, a standard deduction, an enhanced section 87A rebate and a reduced surcharge cap. A taxpayer is now taxed under section 115BAC unless he opts out into the old regime; for those with business or professional income the opt-out is exercised through Form 10-IEA and is subject to the once-in-a-lifetime switching restriction, while a taxpayer without business income may choose afresh each year.
The policy is to move the personal-tax base to a lower-rate, fewer-exemptions structure by default, simplifying compliance while withdrawing the bulk of Chapter VI-A deductions (other than the limited carve-outs such as the employer's NPS contribution under section 80CCD(2) and section 80JJAA) and several exemptions and the additional/accelerated depreciation for the business class.
A.2 Sub-section / clause taxonomy
Sub-section (1A) (the default regime, FA 2023): concessional slabs for individuals/HUF/AOP/BOI/AJP for AY 2024-25 onward, with the standard deduction and the enhanced section 87A rebate. Conditions: total income computed without the specified exemptions/deductions and without set-off of related losses and additional depreciation. Sub-section providing the opt-out: a person may exercise the option to be taxed under the old regime; for a person with business/professional income the opt-out (and any one-time switch back) is through Form 10-IEA by the return due date, whereas a person without business income may opt out each year in the return.
A.3 Core doctrinal themes
Theme (1) - Default, not optional, from AY 2024-25: the burden has reversed - section 115BAC applies automatically unless the taxpayer affirmatively opts out; the older 'opt-in' framing (AY 2021-22 to 2023-24) is superseded.
Theme (2) - Asymmetric switching: a taxpayer without business income chooses regime annually; a taxpayer with business income who opts out can switch back to the new regime only once, after which the new regime is final (the Form 10-IEA discipline).
Theme (3) - Exemptions/deductions forgone with limited carve-outs: most Chapter VI-A deductions and several exemptions are unavailable, but the standard deduction, employer's NPS under section 80CCD(2), section 80JJAA and a few others survive; the enhanced section 87A rebate makes the regime tax-free up to the prescribed threshold.
A.4 Legislative evolution / Finance Act amendment trail
Inserted by the Finance Act, 2020 (optional, AY 2021-22). Recast as the default regime by the Finance Act, 2023 (AY 2024-25), with new slabs, standard deduction, enhanced section 87A rebate (making income up to Rs.7,00,000 effectively tax-free under the regime) and a reduced top surcharge of 25%. The Finance Act, 2025 further revised the slab structure and raised the section 87A rebate threshold for the regime (the special-rate-income limitation on the 87A rebate being an FA 2025 feature).
Finance Act 2026: section 115BAC (the default new regime for individuals/HUF and others) is PRESERVED. As recorded in the firm's FA 2026 Amendment Tracker (item 28), the default new regime is continued and its slab structure preserved; income-tax rates for Tax Year 2026-27 are unchanged from the preceding year (Tracker, Tax Rates item).
A.5 CA practitioner pointers
(1) Treat the new regime as the default - a taxpayer who wants the old regime must affirmatively opt out (Form 10-IEA where there is business/professional income). (2) For salaried/non-business clients, run the annual old-vs-new comparison; the choice is available each year. (3) For business clients, advise carefully before opting out - the switch back to the new regime is available only once. (4) Map which deductions survive (standard deduction, 80CCD(2), 80JJAA) and which are lost; recompute losses/depreciation under the regime's restrictions. (5) Apply the enhanced section 87A rebate, noting the FA 2025 limitation of the rebate against certain special-rate incomes.
B. FINANCE ACT, 2026 - IMPACT NOTE
Section 115BAC is PRESERVED by the Finance Act, 2026, and is the live default personal-tax regime for AY 2026-27 onward. The FA 2026 Amendment Tracker records (item 28) that the default new regime for individuals/HUFs is continued with its slab structure preserved, and (Tax Rates item) that income-tax rates for Tax Year 2026-27 are unchanged from the previous year. FA 2026 makes no structural change to the regime; the asymmetric switching rules and the standard deduction/87A rebate carry forward.
C. CASE LAW - CLUSTERED BY ISSUE
Cluster C-1 : Opt-out timing and the Form 10-IE/10-IEA discipline
Form 10-IE / Form 10-IEA timeliness (cognate to the company Form 10-IC condonation line).
Principle: The regime choice for a taxpayer with business/professional income must be exercised through the prescribed form by the return due date. In the cognate company context (Form 10-IC under section 115BAA), the CBDT and the Tribunals have treated a delayed procedural filing as condonable/directory where the substantive choice was clearly made in the return; the same substance-over-form approach has been applied to the personal-regime forms, with delayed or omitted Form 10-IE filings being condoned where the option was evident from the return.
Relevance: Fixes the principal compliance risk under section 115BAC for business taxpayers and supplies the relief route for a late or omitted regime-election form, by analogy to the developed condonation jurisprudence.
Candid note on the case-law field: Section 115BAC is recent and, as the default regime, only from AY 2024-25; a settled body of binding appellate authority dedicated to it is still developing, and most disputes are procedural (form timeliness) or computational (which deductions survive). The position is stated candidly; the governing analogy is the Form 10-IC/10-IE condonation line, and no decision has been invented under section 115BAC.
D. PRACTITIONER'S NOTE
Section 115BAC is now the spine of personal taxation: default unless opted out. For non-business clients, the annual old-vs-new comparison drives the return; for business clients, the Form 10-IEA opt-out and the once-only switch-back demand a considered, documented decision. The compliance risk is form timing (relievable by the condonation jurisprudence), and the computational risk is mis-mapping the surviving deductions and the loss/depreciation restrictions. FA 2026 preserves the regime unchanged for AY 2026-27.
E. SOURCES & CITATIONS
Statutory text verified against the Income-tax Act, 1961 (Bare Act, as amended by the Finance Act, 2025), Chapter XII section 115BAC (inserted by the Finance Act, 2020; recast as default regime by the Finance Act, 2023; slabs/87A revised by the Finance Act, 2025); cross-checked for FA 2026 against the firm's '00 Finance Act 2026 Amendment Tracker.xlsx' (item 28: default new regime preserved; Tax Rates item: TY 2026-27 rates unchanged). Marginal heading reproduced verbatim: 'Tax on income of individuals, Hindu undivided family and others.'
Procedural propositions are read with the Form 10-IE/10-IEA framework and the cognate Form 10-IC condonation jurisprudence (CBDT Circular No. 6/2022 and successors; see the section 115BAA file). Given the recency of the default regime, the developing case-law field is stated candidly rather than supported by off-point citations.
Caveat: Treatise-style commentary for practitioners and academic use; not legal opinion. Slabs, the standard deduction, the section 87A rebate threshold and its limitation against special-rate incomes are revised frequently by the annual Finance Acts; verify the current statutory text, the applicable slabs/rebate and the latest CBDT/appellate position before relying on any proposition.