Income Tax in India: New vs Old Tax Regime Guide (FY 2026–27 / AY 2027–28)

Understanding the choice between the New Tax Regime (Section 115BAC) and the Old Tax Regime is one of the most consequential annual financial decisions for Indian taxpayers. Following recent Union Budgets, the New Tax Regime is now the default tax regime for all individual taxpayers, offering lower slab rates, an expanded standard deduction of ₹75,000, and an enhanced Section 87A rebate.

However, the Old Tax Regime remains fully operational, providing substantial deductions under Chapter VI-A (Section 80C, 80D, 80CCD, 80E, 80G, 80TTA/80TTB), Section 24(b) home loan interest, and Section 10(13A) House Rent Allowance (HRA).

⚡ Key Highlights for FY 2026–27 (AY 2027–28)

🏛️ 1. Income Tax Slabs for FY 2026–27 & FY 2025–26

A. New Tax Regime (Section 115BAC)

The New Tax Regime applies identical tax slabs across all age categories (individuals below 60, senior citizens, and super senior citizens):

B. Old Tax Regime Slabs (Age-Based Exemption Tiers)

Under the Old Regime, the basic exemption threshold differs depending on taxpayer age:

1. Individuals Below 60 Years (General Taxpayers)

2. Senior Citizens (Aged 60 to 79 Years — Resident Individuals)

3. Super Senior Citizens (Aged 80 Years & Above — Resident Individuals)

🎯 2. Understanding the "₹12 Lakh Zero Tax" & Section 87A Rebate

One of the most widely cited provisions of the New Tax Regime is the Section 87A rebate. However, presenting this rule without qualifying standard deduction and total income leads to confusion:

The Law:

• Section 87A provides a tax rebate of up to ₹60,000 for resident individuals whose total taxable income (Gross Income minus standard deduction) does not exceed ₹12,00,000.
• Since normal slab tax on ₹12,00,000 is exactly ₹60,000 (4L@0% + 4L@5% [₹20k] + 4L@10% [₹40k]), the rebate reduces total tax payable to ₹0.

For Salaried Taxpayers:

• Salaried individuals receive a ₹75,000 standard deduction under the New Regime.
• A salaried individual earning a gross salary of ₹12,75,000 computes taxable income as:

  Taxable Income = ₹12,75,000 − ₹75,000 = ₹12,00,000
  

• Because taxable income does not exceed ₹12,00,000, Section 87A rebate of ₹60,000 applies, making their effective tax ₹0.

[!IMPORTANT] Gross Salary vs Taxable Income: The ₹12,00,000 statutory limit applies to net taxable income. Non-salaried taxpayers (e.g. freelancers, business owners, or retirees with only interest income) who do not receive the standard deduction pay zero tax up to ₹12,00,000 gross total income. Salaried taxpayers pay zero tax up to ₹12,75,000 gross salary.

Section 87A Marginal Relief in New Regime:

If your taxable income marginally exceeds ₹12,00,000 (for instance, ₹12,10,000), you are not penalized with the full slab tax of ₹61,500. Under the proviso to Section 87A:

• The tax payable cannot exceed the income earned over ₹12,00,000.
• For ₹12,10,000 taxable income, excess income is ₹10,000.
• Tax payable is capped at ₹10,000 (+ 4% cess = ₹10,400), granting a marginal relief of ₹51,500!
• This marginal relief phases out smoothly at ₹12,70,588 taxable income.

📋 3. Deductions & Exemptions Allowed Under Old Tax Regime

The Old Tax Regime remains advantageous primarily for taxpayers with significant deductions:

1. Section 80C (Maximum ₹1,50,000)

Eligible instruments include:

• Employee Provident Fund (EPF) and Voluntary Provident Fund (VPF)
• Public Provident Fund (PPF)
• Equity Linked Savings Schemes (ELSS)
• Life Insurance Premiums (LIC / Term Life)
• Principal repayment on Housing Loan
• National Savings Certificate (NSC) & 5-Year Post Office Time Deposit
• Sukanya Samriddhi Yojana (SSY)
• Tuition fees for up to 2 children

2. Section 80D (Health Insurance Premiums)

• Self, spouse, and dependent children: up to ₹25,000 (up to ₹50,000 if any member is a senior citizen).
• Parents: additional deduction up to ₹25,000 (up to ₹50,000 if parents are senior citizens).
• Maximum aggregate deduction: ₹1,00,000 (if both taxpayer and parents are senior citizens).
• Includes up to ₹5,000 for preventive health check-ups within the overall limits.

3. Section 10(13A) Eligible HRA Exemption

Salaried employees living in rented accommodation can claim HRA exemption equal to the least of the following three amounts:

1. Actual House Rent Allowance received from the employer.
2. Actual rent paid minus 10% of Basic Salary (+ Dearness Allowance).
3. 50% of Basic Salary (+ DA) for metro cities (Delhi, Mumbai, Kolkata, Chennai) or 40% for non-metro locations.

4. Section 24(b) Home Loan Interest

• Interest paid on home loans for self-occupied property is deductible up to ₹2,00,000 per financial year.
• For let-out (rented) properties, actual interest paid is deductible, but loss under the head "Income from House Property" that can be set off against salary is capped at ₹2,00,000 per year.

5. Section 80CCD(1B) Additional NPS Contribution

• An exclusive deduction up to ₹50,000 for voluntary self-contributions to the National Pension System (NPS Tier-1), over and above the ₹1,50,000 limit of Section 80C.

6. Section 80E (Education Loan Interest)

• Full deduction for interest paid on loans taken for higher education (for self, spouse, or children) for up to 8 consecutive assessment years. There is no upper monetary ceiling.

7. Section 80TTA / 80TTB (Interest Deductions)

• Section 80TTA: Up to ₹10,000 deduction on savings account interest for individuals below 60 years.
• Section 80TTB: Up to ₹50,000 deduction on all bank/post office deposit interest (savings + fixed deposits + recurring deposits) for resident senior citizens (60+ years).

⚖️ 4. High-Income Surcharge & Surcharge Marginal Relief

For individuals with high taxable incomes, surcharge is levied as an additional percentage of the income tax payable:

[!TIP] HNI Advantage in New Regime: The Finance Act capped the maximum surcharge rate under the New Tax Regime at 25% (down from 37%). Consequently, for taxpayers earning more than ₹5 Crores annually, the highest effective marginal tax rate under the New Regime is 39% (30% × 1.25 × 1.04), compared to 42.744% (30% × 1.37 × 1.04) under the Old Regime.

Surcharge Marginal Relief:

Whenever income slightly crosses a surcharge threshold (₹50 Lakh, ₹1 Crore, ₹2 Crore, or ₹5 Crore), statutory marginal relief ensures that the total tax plus surcharge does not exceed the tax on the threshold income plus the amount of income in excess of the threshold.

🔍 5. The Dynamic Break-Even Deduction Concept

Many articles suggest a generic rule of thumb like "if deductions exceed ₹3.75 Lakhs, choose Old Regime." This is mathematically inaccurate.

The exact break-even deduction threshold varies dynamically depending on your gross income, salary structure, and age:

• Income up to ₹12.75 Lakhs (Salaried): The New Regime tax is ₹0. To achieve ₹0 tax under the Old Regime, a salaried person earning ₹12.75 Lakhs would need ₹7.25 Lakhs in total deductions and exemptions (reducing taxable income to ₹5,00,000). For almost all taxpayers at this income level, the New Regime is superior.
• Income of ₹15 Lakhs: Under the New Regime, tax is ₹1,05,000 (+ cess = ₹1,09,200). To match this tax under the Old Regime, you need approximately ₹4,25,000 in total deductions (including the ₹50,000 standard deduction).
• Income of ₹25 Lakhs: Under the New Regime, tax is ₹3,30,000 (+ cess = ₹3,43,200). To beat this under the Old Regime, you need approximately ₹4,75,000 to ₹5,00,000 in eligible deductions.

Use the Finn360 calculator's Dynamic Break-Even Analysis tool to find the exact rupee amount of deductions required for your specific salary.

🔄 6. Rules for Switching Between Regimes (Form 10-IEA)

For Salaried Individuals (No Business/Professional Income):

• Salaried employees have complete flexibility to declare one regime to their employer in April for monthly TDS deduction, and then elect the other regime when filing their annual Income Tax Return (ITR-1 or ITR-2) on or before the statutory due date.
• Salaried taxpayers can switch between the New and Old regimes every year without any restriction.

For Individuals with Business or Professional Income (ITR-3 or ITR-4):

• Freelancers, consultants, doctors, lawyers, and business proprietors who opt out of the New Regime must file Form 10-IEA before the ITR due date.
• They can switch back to the Old Regime only once in their lifetime. Once they switch back to the New Regime thereafter, they cannot opt for the Old Regime again while they continue to earn business or professional income.

📌 Scope & Exclusions

[!NOTE] This calculator is designed primarily for salaried income and ordinary slab-rate income (such as interest, rental income, and consulting income taxed at normal slabs). It does not include special-rate capital gains (such as Short-Term Capital Gains under Section 111A at 20%, Long-Term Capital Gains under Section 112A at 12.5%, or online gaming/lottery winnings under Section 115BB at 30%). Use our dedicated Capital Gains Tax Calculator for special-rate calculations.