Old vs New Tax Regime 2025: A Guide to the Default Slabs (Sec 115BAC)

Key Takeaways

• Default Regime: The New Tax Regime under Section 115BAC is now the default option for all individual taxpayers and HUFs effective from Financial Year 2023-24 (Assessment Year 2024-25). Taxpayers must consciously opt out if they wish to follow the Old Tax Regime.
• Lower Rates, Fewer Deductions: The core principle of the default New Regime is offering lower, more streamlined tax slab rates in exchange for forgoing most of the popular deductions and exemptions like those under Section 80C (EPF, PPF, LIC), Section 80D (Health Insurance), and House Rent Allowance (HRA).
• Key Benefits Retained/Introduced: Despite the removal of many exemptions, the New Regime now includes a standard deduction of ₹50,000 for salaried individuals and pensioners. Additionally, the employer's contribution to the National Pension System (NPS) under Section 80CCD(2) is still a permissible deduction.
• Choice is Annual (for most): Taxpayers without business income have the flexibility to choose between the old and new regimes each financial year when filing their return. However, those with business or professional income have only one opportunity to switch back to the old regime, and if they opt into the new regime again, they cannot return to the old one.

PART 1: EXECUTIVE SUMMARY

(Note: The "Direct Tax Code 2025" has been a topic of discussion for tax reform in India. However, the enacted law that governs the current tax structure is the Income Tax Act, 1961. The significant shift described here refers to the changes within the 1961 Act, where Section 115BAC introduced the New Tax Regime, which has now been made the default choice.)

• The Old Law (1961): The traditional tax system, now referred to as the Old Regime, was characterized by higher slab rates but offered a wide array of over 70 exemptions and deductions. These were designed to encourage savings and investments, including deductions for House Rent Allowance (HRA), Leave Travel Allowance (LTA), and investments under Section 80C, 80D, etc. Tax planning was centered around maximizing these deductions to reduce taxable income.

• The New Law (2025 Context - Default Regime u/s 115BAC): The Finance Act, 2023, made the New Tax Regime under Section 115BAC the default tax regime from FY 2023-24 onwards. This regime functions as the modern equivalent of the simplified tax structure envisioned in Direct Tax Code discussions. Its primary feature is lower, more attractive tax slabs but with the condition that the taxpayer forgoes most major deductions. The structure aims to simplify tax compliance and provide more disposable income to taxpayers who do not make significant tax-saving investments.

• Who is Impacted: This change impacts every individual and HUF taxpayer. The most significantly affected are salaried individuals who have historically relied on HRA, LTA, and Section 80C deductions to lower their tax liability. Taxpayers with lower incomes or those with minimal investments may find the new default scheme more beneficial due to the lower tax rates and enhanced rebate, which makes income up to ₹7 lakh effectively tax-free. Conversely, those with substantial investments and expenses (like high rent, home loan interest on self-occupied property, and full 80C/80D utilization) must now perform a careful evaluation to see if opting out of the default scheme is financially prudent.

PART 2: DETAILED TAX ANALYSIS

1. The Regime Transition Context

The transition to making the New Tax Regime under Section 115BAC the default system represents a significant policy shift by the Government of India. The primary objective is to simplify the direct tax structure, reduce litigation, and offer taxpayers a straightforward system with lower rates without the need for complex tax planning.

This move is in line with the broader, long-term vision of a simplified Direct Tax Code. By removing the majority of exemptions and deductions, the new default regime aims to clean the tax system of complexities that have accumulated in the Income Tax Act, 1961, over decades. The policy encourages a shift from a savings-driven tax system to one that potentially boosts consumption by increasing in-hand income for those who opt for it. For the exchequer, a wider adoption of this simplified regime could lead to better compliance and a more predictable revenue stream.

2. Detailed Comparison: Old Scheme vs Default 2025 Scheme (u/s 115BAC)

The choice between the two regimes hinges on a trade-off between lower tax rates and the availability of tax deductions.

A. Income Tax Slab Rates (For FY 2024-25 / AY 2025-26)

Note: The Old Regime offers a higher basic exemption limit of ₹3,00,000 for senior citizens (60-80 years) and ₹5,00,000 for super senior citizens (80+ years). The New Regime has a uniform basic exemption limit for all individuals.

B. Comparison of Major Deductions & Exemptions

3. Break-Even Mathematical Analysis

A break-even analysis determines the minimum amount of total deductions a taxpayer needs to claim under the Old Regime for it to be more beneficial than the default New Regime. There is no single break-even point; it varies with income levels.

Conceptual Framework: The analysis involves calculating the tax liability under both scenarios:

1. New Regime Tax: Calculated directly on the total income minus the standard deduction of ₹50,000.
2. Old Regime Tax: Calculated on the total income minus the standard deduction and all other eligible deductions (e.g., 80C, 80D, HRA).

A taxpayer should opt out of the default New Regime only if: Tax under Old Regime < Tax under New Regime

Illustrative Break-Even Points: While a precise calculation requires a tax calculator, a general threshold has emerged. If a taxpayer's total claimed deductions (excluding the standard deduction) are significant, the Old Regime tends to be more favorable.

• For an income of ₹10,00,000, the tax in the New Regime is ₹54,600. To match this, a taxpayer in the Old Regime would need to claim deductions of approximately ₹2,50,000 in addition to the standard deduction.
• For an income of ₹15,00,000, the tax in the New Regime is ₹1,56,000. The break-even point for deductions in the Old Regime is around ₹3,00,000.
• For higher incomes, such as ₹20,00,000, if total deductions exceed approximately ₹3,75,000 to ₹4,00,000, the Old Regime generally results in lower tax liability.

This analysis underscores that individuals with high deductions from home loan interest, HRA, and full utilization of Chapter VI-A limits are prime candidates for opting out of the default scheme.

4. How to Opt-Out (If Applicable)

The process for opting out of the default New Tax Regime differs based on the taxpayer's source of income.

• For Salaried Individuals (and those without business income): The choice can be made annually. The taxpayer can simply exercise this option directly within the Income Tax Return (ITR) form (e.g., ITR-1 or ITR-2) at the time of filing. The ITR must be filed on or before the due date specified under section 139(1). No separate form is required.

• For Individuals with Business/Professional Income: The process is more stringent.

  1. File Form 10-IEA: To opt out of the new default regime and switch to the old one, the taxpayer must file Form 10-IEA.
  2. Deadline: This form must be submitted on or before the due date for filing the ITR (typically July 31st or October 31st, as applicable).
  3. Limited Switching: A person with business income who opts out of the default regime has only one lifetime opportunity to switch back to it. Once they have re-entered the new regime, they cannot go back to the old regime again.

5. Final Recommendation

The decision to remain in the default New Regime or opt out for the Old Regime is entirely dependent on an individual's financial profile.

• Remain with the Default New Regime if:

  • You have minimal or no investments in tax-saving instruments like 80C or 80D.
  • You do not have significant expenses that qualify for deductions, such as HRA or home loan interest.
  • You prioritize simplicity, higher liquidity, and reduced compliance burdens over incentive-based savings.
  • Your taxable income is up to ₹7 lakh, where the rebate under Section 87A makes your tax liability zero.

• Opt-Out and Choose the Old Regime if:

  • You fully utilize deductions under Section 80C (₹1.5 lakh) and 80CCD(1B) (₹50,000).
  • You pay a significant amount for medical insurance premiums (Section 80D).
  • You have a high HRA component and pay substantial rent.
  • You are servicing a home loan on a self-occupied property with a high interest component (up to ₹2 lakh).
  • A break-even analysis clearly shows a lower tax liability under the Old Regime.

Our team strongly advises all taxpayers to perform a detailed comparative analysis each year before filing their returns. Use an official income tax calculator to input your specific income and deduction figures to arrive at an informed and optimal decision.

💡 Tax Planning Tip: Use a reliable tax calculator to check your break-even point between the Old and New Regime in 2026.