Published 9 May 2026
Section 115BAC of the Income-tax Act, 1961 read with the Finance Act, 2025 amendments -- the structural trade-off between the wider new-regime slabs and the loss of the Chapter VI-A deduction stack; the 2026 break-even analysis across income bands; the impact of the section 87A new-regime rebate at Rs 60,000 for income up to Rs 12 lakh; and the practitioner's framework for the regime decision in 2026
Taxpayer Brief
Section 115BAC of the Income-tax Act, 1961 -- the new tax regime introduced by Finance Act, 2020, made the default from Tax Year 2023-24 onwards, and steadily enhanced through Finance Acts of 2023, 2024, and 2025 -- represents a fundamental structural shift in Indian individual taxation. The trade-off is precise -- accept the wider 0% / 5% / 10% / 15% / 20% / 25% / 30% slab structure with bands at Rs 4 lakh / Rs 8 lakh / Rs 12 lakh / Rs 16 lakh / Rs 20 lakh / Rs 24 lakh and the section 87A rebate at Rs 60,000 for income up to Rs 12 lakh, but lose the section 80C investment deduction (Rs 1.5 lakh), the section 80D mediclaim (Rs 25-50K), the section 80TTB senior-citizen interest (Rs 50K), the section 24(b) home-loan interest for self-occupied property (Rs 2 lakh), the House Rent Allowance exemption under section 10(13A), the Leave Travel Concession exemption under section 10(5), and most other Chapter VI-A items. The practitioner's challenge is to compute the net tax outcome under both regimes for each client annually and elect the lower. This article walks through the framework, the income-band break-even analysis, and the strategic positioning.
Complexity Matrix
Feature | Complexity Level | Primary Risk |
|---|---|---|
Salaried under Rs 7.5 lakh income, low deductions | Low | New regime decisively wins via Section 87A |
Salaried Rs 7.5-15 lakh with moderate 80C/80D | Medium | Break-even depends on aggregate |
Salaried above Rs 15 lakh with full deduction stack including 24(b) | High | Old regime usually wins |
Self-employed / Business owner switching regimes | Very High | Once-in-lifetime restriction (HNI-12) |
1. The Slab Architecture Comparison
Slab | Old Regime | New Regime under Section 115BAC (post Finance Act, 2025) |
|---|---|---|
Up to Rs 2.5 lakh (Rs 3L senior; Rs 5L super-senior) | Nil | Nil (Rs 4 lakh threshold for new regime; no age differentiation) |
Rs 2.5 lakh / Rs 4 lakh to Rs 5 lakh | 5% | Nil to 5% |
Rs 5 lakh to Rs 8 lakh | 20% | 5% |
Rs 8 lakh to Rs 10 lakh | 20% | 10% |
Rs 10 lakh to Rs 12 lakh | 30% | 10% |
Rs 12 lakh to Rs 16 lakh | 30% | 15% |
Rs 16 lakh to Rs 20 lakh | 30% | 20% |
Rs 20 lakh to Rs 24 lakh | 30% | 25% |
Above Rs 24 lakh | 30% | 30% |
The slab-rate gap converges at Rs 24 lakh Below Rs 24 lakh of total income, the new regime's slab structure is materially cheaper than the old regime's slab structure -- by Rs 50,000 to Rs 2.5 lakh annually depending on the income level. At and above Rs 24 lakh, both regimes apply 30% to the marginal rupee. The break-even between regimes therefore depends entirely on the deduction stack -- if the assessee's old-regime deductions are large enough to compensate for the new-regime slab advantage, old wins; otherwise, new wins. |
2. The Disallowed Deductions Stack -- New Regime
Deduction | Old Regime | New Regime under Section 115BAC |
|---|---|---|
Section 80C (Provident Fund / Public Provident Fund / life insurance / ELSS / NSC / tuition / 5-year FD / housing principal / Sukanya Samriddhi) | Up to Rs 1.5 lakh | Disallowed |
Section 80D (Mediclaim premium for self / spouse / children / parents) | Up to Rs 75,000 typically (Rs 50K self + Rs 50K parent senior) | Disallowed |
Section 80TTB (Senior-citizen interest from bank / post-office / co-operative bank) | Rs 50,000 | Disallowed |
Section 80E (Education-loan interest) | Unlimited for 8 years | Disallowed |
Section 80G (Donations to charitable / religious / political organisations) | 50%-100% of qualifying | Disallowed (mostly; specific donations to Government may be allowed) |
Section 80CCD(1B) (Additional NPS Tier-I contribution) | Rs 50,000 | Disallowed |
Section 24(b) (Home-loan interest -- self-occupied) | Up to Rs 2 lakh | Disallowed |
Section 24(b) (Home-loan interest -- let-out) | Unlimited (with Rs 2 lakh inter-head set-off cap) | Allowed against rental; loss not set off against Salary |
Section 10(13A) House Rent Allowance | Allowed per Rule 2A | Disallowed |
Section 10(5) Leave Travel Concession | Allowed per Rule 2B | Disallowed |
Standard Deduction (Section 16(ia)) | Rs 50,000 | Rs 75,000 (raised from Rs 50,000 by Finance Act, 2024) |
Section 87A rebate | Rs 12,500 if total income up to Rs 5 lakh | Rs 60,000 if total income up to Rs 12 lakh |
3. The Income-Band Break-Even Analysis -- Tax Year 2026-27
The break-even point between the two regimes can be computed mechanically by setting the old-regime tax (after deductions) equal to the new-regime tax. The break-even varies by income band.
Annual Total Income | New-Regime Tax (post Rs 75K standard deduction) | Old-Regime Break-Even Deductions |
|---|---|---|
Up to Rs 7.5 lakh | Nil (post Section 87A) | New regime wins; old-regime deductions cannot reduce tax below nil |
Rs 10 lakh | Approximately Rs 30,000 | Old regime wins if deductions above Rs 1.65 lakh aggregate |
Rs 15 lakh | Approximately Rs 1.05 lakh | Old regime wins if deductions above Rs 3.50 lakh aggregate |
Rs 20 lakh | Approximately Rs 2.10 lakh | Old regime wins if deductions above Rs 4.50 lakh aggregate |
Rs 30 lakh | Approximately Rs 4.95 lakh | Old regime wins if deductions above Rs 6 lakh aggregate |
Rs 50 lakh | Approximately Rs 11.10 lakh + 10% surcharge | Old regime wins if deductions above Rs 5 lakh aggregate -- often hard at this income |
Rs 1 crore | Approximately Rs 28 lakh + 15% surcharge | Old regime break-even at very high deductions; rarely achieved at this income |
The structural conclusion For most salaried assessees up to Rs 12.75 lakh of gross salary, the new regime is decisively better (Section 87A rebate produces zero tax). For assessees with high deduction profiles (Section 24(b) Rs 2 lakh + 80C Rs 1.5 lakh + 80D Rs 75K + 80CCD(1B) Rs 50K = Rs 4.75 lakh aggregate), the old regime breaks even around Rs 15-17 lakh income. Above that band, the comparison becomes profile-specific. Above Rs 50 lakh of income, the old regime's break-even requires deductions above Rs 5 lakh -- often hard to achieve genuinely; new regime usually wins at HNI levels. |
4. Worked Example -- Three Salaried Profiles
Profile A -- Mid-Range Salaried (Income Rs 12 lakh)
Mr. P, salary Rs 12 lakh. Section 80C Rs 1.5 lakh + Section 80D Rs 25K + section 24(b) Rs 1.8 lakh = Rs 3.55 lakh aggregate.
Computation | Old Regime | New Regime |
|---|---|---|
Salary | Rs 12,00,000 | Rs 12,00,000 |
Less: Standard deduction | (Rs 50,000) | (Rs 75,000) |
Less: Section 24(b) (in old) | (Rs 1,80,000) | Nil |
Less: Section 80C / 80D | (Rs 1,75,000) | Nil |
Total Income | Rs 7,95,000 | Rs 11,25,000 |
Slab Tax | Approximately Rs 71,500 | Approximately Rs 47,500 |
Less: Section 87A rebate | Income > Rs 5L; not available | Income < Rs 12L; rebate Rs 47,500 |
Plus 4% Cess | Rs 2,860 | Nil |
Total Tax Payable | Approximately Rs 74,360 | Nil |
Verdict | New Regime wins by Rs 74,360 |
Profile B -- Senior Salaried (Income Rs 25 lakh)
Ms. Q, salary Rs 25 lakh. Section 80C Rs 1.5 lakh + Section 80D Rs 75K (self + parent senior) + section 24(b) Rs 2 lakh + 80CCD(1B) Rs 50K + HRA Rs 2 lakh = Rs 6.75 lakh aggregate.
Computation | Old Regime | New Regime |
|---|---|---|
Salary | Rs 25,00,000 | Rs 25,00,000 |
Less: Standard deduction | (Rs 50,000) | (Rs 75,000) |
Less: HRA | (Rs 2,00,000) | Nil |
Less: Section 24(b) | (Rs 2,00,000) | Nil |
Less: Section 80C / 80D / 80CCD(1B) | (Rs 2,75,000) | Nil |
Total Income | Rs 17,75,000 | Rs 24,25,000 |
Slab Tax | Approximately Rs 3,32,500 | Approximately Rs 4,06,250 |
Plus 4% Cess | Rs 13,300 | Rs 16,250 |
Total Tax | Approximately Rs 3,45,800 | Approximately Rs 4,22,500 |
Verdict | Old Regime wins by Rs 76,700 |
Profile C -- HNI Salaried (Income Rs 75 lakh)
Mr. R, total taxable income Rs 75 lakh. Even at full deduction stack of Rs 6 lakh including HRA + 24(b) + 80C + 80D + 80CCD(1B).
Computation | Old Regime | New Regime |
|---|---|---|
Income (after standard deduction) | Rs 74,50,000 | Rs 74,25,000 |
Less: Aggregate deductions | (Rs 6,00,000) | Nil |
Total Income | Rs 68,50,000 | Rs 74,25,000 |
Slab Tax | Approximately Rs 18,30,000 | Approximately Rs 16,55,500 |
Plus 10% Surcharge (income > Rs 50L) | Rs 1,83,000 | Rs 1,65,550 |
Plus 4% Cess | Rs 80,520 | Rs 72,842 |
Total Tax | Approximately Rs 20,93,520 | Approximately Rs 18,93,892 |
Verdict | New Regime wins by Rs 1,99,628 |
The HNI tilt At HNI income levels (Rs 50 lakh and above), the new regime usually wins -- the wider slabs save more tax than the deduction stack saves, even at the maximum deduction profile. Below the HNI band (Rs 15-20 lakh), the deduction profile dominates; old regime wins for the dedicated tax-planner with full Section 24(b) home-loan + 80C + 80D + 80CCD(1B) + HRA stack. Below Rs 12.75 lakh, new regime decisively wins via Section 87A. |
5. Practitioner's Annual Workflow
- In April -- gather projected income for the year and the assessee's deduction profile.
- Run both regimes' computation; choose the lower-tax regime.
- File Form 10-IEA opting INTO old regime if old wins; default new regime applies otherwise.
- For salaried -- the regime choice affects the employer's monthly Tax Deducted at Source -- communicate to Human Resources before April.
- Annual review -- regime choice can be switched year by year for salaried; once-in-lifetime for business owners (HNI-12).
- Document the comparative computation in the client file for audit trail.
6. Case Law Reference and Anticipatory Legal Analysis
Case Law Reference: The optionality of regime election Section 115BAC of the Income-tax Act, 1961 was enacted by the Finance Act, 2020 with the new regime introduced as an opt-IN regime; the Finance Act, 2023 inverted this -- the new regime became default and old regime became opt-IN. The timing of the option to stay in the old regime is fixed by section 115BAC(6) itself: a person with income from business or profession must exercise it on or before the due date under section 139(1) (in Form 10-IEA), and the option then continues for later years; any other person exercises it along with the return furnished under section 139(1) for that year. |
Prospective Interpretation -- The HNI break-even arithmetic The break-even between old and new regimes shifts year-on-year as Finance Acts adjust slabs, the standard deduction, and the section 87A rebate. The Finance Act, 2025 widening of the section 87A threshold to Rs 12 lakh of total income with rebate up to Rs 60,000 has further compressed the old-regime advantage band. Two unsettled interpretive issues remain. (i) Treatment of marginal relief above the Rs 12 lakh threshold -- the Finance Act, 2025 provides smooth transitional relief, but the precise computation mechanic (whether tax-on-incremental-income or tax-on-aggregate-with-cap) requires clarification. (ii) Treatment of carry-forward losses set off in the year of regime switching -- where the assessee was on old regime in year T and switches to new regime in year T+1, can old-regime carry-forward losses be set off against new-regime income? Section 115BAC(2)(ii)(a) answers part of this: under the new regime, a loss or depreciation carried forward from an earlier year cannot be set off to the extent it is attributable to the deductions the new regime disallows. |
7. Key Takeaways
- Section 115BAC new regime has wider slabs and Rs 60,000 Section 87A rebate up to Rs 12 lakh -- but disallows most Chapter VI-A deductions.
- Break-even varies by income band -- new regime decisively wins below Rs 12.75 lakh; old regime wins Rs 15-17 lakh with full stack; at HNI levels new regime usually wins again.
- Per-assessee annual computation is essential -- there is no one-size-fits-all answer.
- Standard deduction differential -- Rs 75K (new) vs Rs 50K (old) -- adds Rs 7,500-15,000 of effective benefit to new regime.
- Section 24(b) home-loan interest is the single largest deduction lost in moving to new regime -- worth Rs 60,000+ annually for taxpayers in 30% bracket with self-occupied home loan.
- Form 10-IEA filing required to opt INTO old regime; default is new.
Disclaimer: This article is for general information only. It does not constitute tax / legal advice. Please consult a qualified Chartered Accountant or tax practitioner for advice specific to your circumstances. The legal position is current as of FA 2024 (No. 2) / FA 2025; subsequent amendments and CBDT notifications may modify the position.