Direct Tax: Comparing India's Section 115BAC New vs. Old Tax Regimes

For the financial year (FY) 2025-26, corresponding to the assessment year (AY) 2026-27, Indian taxpayers face a crucial financial decision: choosing between the Old Tax Regime and the New Tax Regime under Section 115BAC. Originally introduced in Union Budget 2020, the New Tax Regime has undergone successive optimizations, most notably in Budget 2024 and 2025, to make it the default and more attractive option. This comprehensive guide details the structure of both regimes, lists the available deductions, compares the surcharge rates, and offers mathematical models to help you identify the optimal choice for your income profile.

1. Statutory Slab Structures for AY 2026-27

The slab structures of the two regimes differ significantly in both tax rates and bracket distributions. The New Tax Regime features more brackets with lower rates, while the Old Tax Regime has wider brackets but rapidly scales to the maximum rate of 30%.

The New Tax Regime Slabs (Section 115BAC)

The New Tax Regime tax slabs for FY 2025-26 (AY 2026-27) are structured as follows:

The Old Tax Regime Slabs

The Old Tax Regime slabs for general individuals below 60 years of age remain unchanged:

2. Deductions and Exemptions: The Key Trade-off

The primary difference between the regimes lies in the treatment of deductions and exemptions. The Old Tax Regime allows taxpayers to lower their taxable income by utilizing various provisions under the Income Tax Act, whereas the New Tax Regime removes most of these benefits in exchange for lower tax rates.

Deductions Allowed ONLY Under the Old Tax Regime

If you choose the Old Tax Regime, you can claim:

• Section 80C: Up to INR 1,50,000 for investments in Public Provident Fund (PPF), Employee Provident Fund (EPF), Equity Linked Savings Schemes (ELSS), Life Insurance Premium, National Savings Certificate (NSC), and principal repayment of home loans.
• Section 80D: Up to INR 25,000 for health insurance premiums for self, spouse, and dependent children (increased to INR 50,000 if parents are senior citizens).
• Section 24(b): Up to INR 2,00,000 for interest paid on a home loan for a self-occupied property.
• House Rent Allowance (HRA): Tax exemption on rent paid, calculated as the minimum of the actual HRA received, rent paid minus 10% of basic salary, or 40%/50% of basic salary.
• Leave Travel Allowance (LTA): Exemption for travel costs incurred during domestic vacations.
• Section 80G: Deductions for charitable donations.
• Section 16(iii): Professional Tax deduction of up to INR 2,500.

Deductions Allowed Under the New Tax Regime (Section 115BAC)

The New Tax Regime disallows almost all of the above, with a few notable exceptions:

• Standard Deduction: Salaried employees receive a deduction of INR 75,000 (up from INR 50,000 in previous years).
• Section 80CCD(2): Employer contribution to the National Pension System (NPS), up to 14% of the employee's basic salary and dearness allowance.
• Section 80CCH(2): Contributions made to the Agnipath Scheme.
• Standard Deduction on Family Pension: Allowed up to INR 25,000.

3. Tax Rebate under Section 87A

The Section 87A rebate provides relief to middle-income earners by effectively neutralizing tax liability below a certain threshold.

• New Tax Regime: Taxpayers with net taxable income up to INR 7,00,000 are eligible for a full rebate, making their tax liability zero. With the standard deduction of INR 75,000, an individual with a gross salary of up to INR 7,75,000 pays zero tax under the New Tax Regime.
• Old Tax Regime: The rebate is available only for net taxable income up to INR 5,00,000. With the standard deduction of INR 50,000, an individual with a gross salary up to INR 5,50,000 pays zero tax under the Old Tax Regime.

4. Surcharge Structures for High Earners

High-income individuals earning above INR 50 Lakhs are subject to an additional surcharge calculated as a percentage of their income tax. Budget updates capped the maximum surcharge rate under the New Tax Regime, making it significantly more beneficial for high net worth individuals (HNIs).

*Note: A mandatory 4% Health & Education Cess is levied on the aggregate of the income tax and the surcharge under both regimes.*

5. Mathematical Comparison & Breakeven Analysis

To determine which regime is better, taxpayers must compute their "breakeven deduction threshold." If your total eligible deductions under the Old Tax Regime exceed this threshold, the Old Tax Regime will result in lower tax liability.

Example Case Study

Consider a salaried employee under 60 years of age with a gross salary of INR 15,00,000.

Option A: New Tax Regime

• Gross Salary: INR 15,00,000
• Standard Deduction: INR 75,000
• Net Taxable Income: INR 14,25,000
• Tax Calculation:
• Up to INR 4,00,000: Nil
• INR 4,00,001 to 8,00,000: 5% of 4,00,000 = INR 20,000
• INR 8,00,001 to 12,00,000: 10% of 4,00,000 = INR 40,000
• INR 12,00,001 to 14,25,000: 15% of 2,25,000 = INR 33,750
• Base Tax: INR 93,750
• Add 4% Health & Education Cess: INR 3,750
• Total Tax Payable: INR 97,500

Option B: Old Tax Regime (With Max Deductions)

Assume the employee claims:

• Standard Deduction: INR 50,000
• Section 80C: INR 1,50,000
• Section 80D: INR 25,000
• Section 24(b) (Home loan interest): INR 2,00,000
• Professional Tax: INR 2,500
• Total Deductions: INR 4,27,500
• Net Taxable Income: INR 10,72,500
• Tax Calculation:
• Up to INR 2,50,000: Nil
• INR 2,50,001 to 5,00,000: 5% of 2,50,000 = INR 12,500
• INR 5,00,001 to 10,00,000: 20% of 5,00,000 = INR 1,00,000
• INR 10,00,001 to 10,72,500: 30% of 72,500 = INR 21,750
• Base Tax: INR 1,34,250
• Add 4% Health & Education Cess: INR 5,370
• Total Tax Payable: INR 1,39,620

In this scenario, even with INR 4.275 Lakhs in deductions, the Old Tax Regime results in a tax liability of INR 1,39,620, which is INR 42,120 higher than the New Tax Regime (INR 97,500). The taxpayer would need substantially higher deductions, such as HRA or interest on a home loan, to justify choosing the Old Tax Regime.