New vs Old Tax Regime: How to Decide (India 2025)

The 2025 Union Budget overhauled the new tax regime significantly. For the first time, a large majority of salaried taxpayers — including many who previously benefited from aggressive deduction planning — now pay less tax under the new regime. But "most people" is not "all people." The decision still depends on your specific income and deduction profile, and a wrong choice made at the start of the financial year can cost you anywhere from a few thousand to over a lakh of rupees.

New tax regime slabs for FY 2025–26

The revised slabs introduced in Budget 2025 are:

• ₹0–4 lakh: Nil
• ₹4–8 lakh: 5%
• ₹8–12 lakh: 10%
• ₹12–15 lakh: 15%
• ₹15–20 lakh: 20%
• ₹20–24 lakh: 25%
• Above ₹24 lakh: 30%

The standard deduction under the new regime is ₹75,000 for salaried employees. Section 87A provides a full rebate for taxable income up to ₹12 lakh — meaning after the ₹75,000 standard deduction, a salaried person with gross income up to ₹12.75 lakh pays zero income tax under the new regime. That is the headline that changed everything.

What the old regime still gives you

The old regime's slabs look worse on paper (5% from ₹2.5–5L, 20% from ₹5–10L, 30% above ₹10L). But the old regime preserves every deduction and exemption that the new regime removes:

• Section 80C: ₹1.5 lakh (PPF, ELSS, EPF employee contribution, LIC premium, home loan principal, tuition fees)
• HRA exemption: Actual rent paid minus 10% of basic salary — largest exemption for metro employees
• Section 80D: ₹25,000 health insurance premium; ₹50,000 if parents are senior citizens
• Section 24(b): ₹2 lakh home loan interest on self-occupied property
• Section 80CCD(1B): Additional ₹50,000 NPS contribution above the 80C cap
• LTA (Leave Travel Allowance) exemption
• Standard deduction: ₹50,000 (lower than new regime by ₹25,000)

If you claim all of these, total deductions can easily reach ₹4–5 lakh or more, bringing your taxable income down significantly even from a higher base.

The break-even calculation

The question is not "which regime is better" — it is "at your income and deduction level, which regime produces a lower tax number?" Run the comparison:

1. Calculate tax under the new regime on (gross income − ₹75,000 standard deduction).
2. Calculate tax under the old regime on (gross income − your actual deductions − ₹50,000 standard deduction).
3. The regime with the lower number wins.

As a rough guide for salaried employees in FY 2025–26:

• ₹8–12 lakh income: New regime wins for most people. Old regime only wins if HRA + 80C + 80D together exceed ~₹3.5 lakh.
• ₹12–15 lakh income: New regime often wins, but old regime beats it if you have a home loan interest deduction + full 80C + HRA in a metro.
• ₹15–20 lakh income: Old regime becomes competitive once deductions cross roughly ₹4.25 lakh (home loan interest + full 80C + 80D + NPS).
• Above ₹20 lakh income: Old regime frequently wins if deductions are at or near maximum utilisation.

The exact break-even point shifts based on your salary structure — how much of your CTC sits in allowances vs basic, whether your employer pays NPS, and whether HRA is in your structure at all. A chartered accountant can model both regimes precisely for your payslip in under 30 minutes.

Who is almost certainly better off in the new regime

• Salaried employees earning up to ₹12.75 lakh with minimal investment deductions
• Young professionals early in their career with few financial commitments
• People on a flat CTC with no separate HRA component
• Employees in smaller cities who pay low rent (HRA exemption is thin)
• Those who invest in EPF but cannot separately fill ₹1.5L in other 80C instruments

Who should model the old regime carefully before switching

• Anyone servicing a home loan above ₹40 lakh (interest deduction often ₹1.5–2 lakh annually)
• Salaried metro employees claiming HRA at a high basic salary — HRA exemption can be ₹1.5–3 lakh+
• Families paying health insurance for senior citizen parents (combined 80D limit reaches ₹75,000)
• Taxpayers maximising Section 80CCD(1B) NPS — this ₹50,000 deduction exists only in the old regime
• Self-employed professionals with significant allowable business expenses

How to switch regimes (and the limits)

For salaried employees, switching regimes happens through the investment declaration you submit to your employer at the start of the financial year. The new regime is the default — you must actively opt into the old regime if you want it. You can also switch when filing your ITR (salaried employees with no business income can switch freely, once per year).

For business owners and self-employed professionals, the rules are stricter. You can exit the new regime once, after which you are locked into the old regime permanently (a very limited re-entry option exists but rarely applies in practice). This makes the regime decision significantly more consequential for self-employed individuals — a wrong choice cannot be undone.

When it is worth talking to a CA

You do not need a CA for the basic break-even calculation — the guidance above handles most straightforward salaried cases. But a CA conversation pays for itself when:

• Your salary structure is complex — ESOPs, perquisites, multiple employers in the same year
• You have both salary income and business income in the same FY
• You are switching jobs mid-year and want to know how that affects TDS liability and regime choice
• You are an NRI or returning NRI with foreign income in scope for Indian tax
• You want to model a multi-year strategy, not just the current year

A one-time call with a chartered accountant on TrunkCall typically runs 15–30 minutes and gives you a specific rupee number, not a generic recommendation.