Old vs New Tax Regime: How to Choose in 15 Minutes

Every April, HR sends a mail asking which tax regime you want. Most people reply with whatever they chose last year, or ask a colleague, or ignore it and hope for the best.

That's a pity, because the right choice can save tens of thousands of rupees, and the wrong one costs the same. The good news is that you can decide in about fifteen minutes with a calculator and your salary slip.

The new regime charges lower tax rates but takes away most deductions. The old regime charges higher rates but lets you reduce your taxable income with deductions such as HRA, Section 80C investments, home loan interest and health insurance.

Since the new regime became the default, you are in it unless you opt out. If you do nothing, your employer deducts tax under the new regime.

These are the slabs I found for FY 2026-27 for individuals. Rates change in the Union Budget, so confirm them on the Income Tax Department website.

New regime

A rebate under Section 87A makes tax zero if your taxable income is up to ₹12 lakh. Salaried people get a standard deduction of ₹75,000, so a salary up to about ₹12.75 lakh pays no tax in the new regime.

Old regime

The standard deduction is ₹50,000 and the rebate applies only up to ₹5 lakh of taxable income. Add 4% health and education cess on the tax in both regimes. Higher incomes also pay a surcharge.

One note on law: India has replaced the 1961 Income-tax Act with the Income-tax Act, 2025, which applies from 1 April 2026. Section numbers such as 80C may have new numbers in the new Act, but the benefits are carried across. I use the familiar names here because that is what payslips and apps still call them.

The employer's NPS contribution is the one big deduction that survives in the new regime. If your company offers it, ask about it.

You need three numbers: your gross taxable salary, your total deductions if you chose the old regime, and a tax calculator. The Income Tax Department's own calculator is free and does both regimes.

1. Write down your annual salary (taxable part, before deductions).
2. List the old-regime deductions you could honestly claim. HRA exemption (use the lowest of the three HRA rules, or let the calculator do it), 80C, home loan interest, 80D, NPS.
3. Run the calculation twice. Once for the new regime with only the standard deduction. Once for the old regime with everything.
4. Compare the two tax figures. Pick the lower.

Arjun earns ₹15 lakh a year in Bengaluru and pays rent.

• Old regime deductions: standard deduction ₹50,000, HRA exemption about ₹2.2 lakh, 80C ₹1.5 lakh, 80D ₹25,000. Total ≈ ₹4.45 lakh. Taxable income ≈ ₹10.55 lakh.
• New regime: only the ₹75,000 standard deduction. Taxable income = ₹14.25 lakh.

Rough tax: old regime ≈ ₹1.1 lakh before cess; new regime ≈ ₹1.15 lakh before cess. The two are close, which is the common case at this income. Small changes, such as a smaller HRA exemption or less 80C, tip the result to the new regime.

Compare this with Meera, who earns ₹10 lakh, lives with her parents and has only her EPF as 80C. Her new-regime tax is zero because of the rebate. The old regime would charge her tax. For Meera the answer is obvious.

At incomes in the ₹15 to 25 lakh range, the old regime tends to win only when your total deductions (not counting the standard deduction) are roughly ₹3.5 to 4.5 lakh or more. Below that, the new regime usually wins. This is only a guide. The exact break-even depends on your income, so run the calculator.

The old regime gets more attractive if you:

• Pay high rent in a metro and receive HRA
• Are paying a home loan with interest above ₹1.5 lakh
• Already invest the full ₹1.5 lakh in 80C for other reasons
• Pay health insurance premiums for parents

1. Investing only to save tax. If the new regime suits you, you don't need to buy a tax-saving product in March. Invest for your goals instead. If you want to start, see SIP for beginners.

2. Counting deductions you won't really claim. Lock-in products you haven't bought don't reduce your tax. Use actual numbers.

3. Forgetting rent receipts and proof. The old regime needs HRA proofs, and landlord PAN is needed if rent is above ₹1 lakh a year.

4. Not telling HR in time. Your employer deducts tax during the year based on your declaration. If you declare the wrong regime, you'll have too much or too little tax cut, and you'll fix it when filing.

5. Thinking the choice is permanent. For salaried people it isn't. You can switch each financial year when you file, even after declaring something else to your employer.

1. Open your last payslip and note your annual gross.
2. List your real deductions.
3. Run the calculator under both regimes.
4. Tell your employer your choice and submit proofs if you chose the old regime.
5. Put a reminder for April each year. Your life changes, and so should your choice.

If you have no business income, yes. You choose each year when you file the return, and the choice at filing time is what counts. If you have business or professional income, the rules for switching are stricter. Check before you switch.

File your return under the new regime. The extra tax your employer deducted comes back as a refund.

For a salary up to about ₹12.75 lakh, you pay no tax under the new regime, so yes, it is almost always better. The exception is if you want to claim a refund of tax already deducted. You'd still file under the new regime.

You don't need them for tax. You may still want some of them, such as EPF, for the retirement savings themselves. The comparison is in EPF vs PPF vs NPS.

Yes. Your employer deducts monthly tax (TDS) according to your regime. For a view of how deductions turn into take-home pay, read CTC vs in-hand salary.

Tax rules, slabs and limits are as of October 2026 and can change with each Union Budget. This article is educational, not tax advice. Confirm figures on the Income Tax Department website or with a chartered accountant.