Old vs new tax regime FY 2025-26 — which one to choose

The biggest tax change of FY 2025-26 is the one that quietly removed income tax for most salaried Indians earning under ₹12.75 lakh CTC.

The new regime’s Section 87A rebate now zeros out tax on taxable income up to ₹12,00,000. Combined with the ₹75,000 standard deduction, that’s a gross salary of about ₹12.75 lakh — a full ₹3.75 lakh higher than the old rebate ceiling of ₹5 lakh. If your CTC is in the ₹12L–₹13L range and you have nothing exotic going on, your annual income tax under the new regime is ₹0.

That’s not a typo. Run the salary calculator with ₹12,75,000 CTC, Bangalore, age below 60, no deductions, and the new-regime line reads ₹0 tax for the year.

This single rule has flipped the regime question for most salaried Indians. The default has changed.

But the old regime hasn’t died. For specific situations — homeowners with high deductions, taxpayers in metros paying real rent, anyone whose 80C + 80D + 24(b) stack lands above ₹4 lakh — the old regime still wins, sometimes by a meaningful margin.

Here’s the math for both, and a clear framework for choosing.

What changed in FY 2025-26

The new regime under FY 2025-26 has seven slabs, not five:

• ₹0 – ₹4,00,000: 0%
• ₹4,00,001 – ₹8,00,000: 5%
• ₹8,00,001 – ₹12,00,000: 10%
• ₹12,00,001 – ₹16,00,000: 15%
• ₹16,00,001 – ₹20,00,000: 20%
• ₹20,00,001 – ₹24,00,000: 25%
• Above ₹24,00,000: 30%

The standard deduction for salaried employees is ₹75,000. The 87A rebate is up to ₹60,000 for taxable income up to ₹12,00,000. The marginal relief band kicks in just past ₹12L and resolves around ₹12,70,000 of taxable income.

What this means in practice: gross salary up to about ₹12,75,000 pays no income tax under the new regime. Past that, tax rises along the slab structure, but slowly — the cumulative effective rate at ₹15L gross is about 5.6%, at ₹20L about 9%, at ₹30L about 14%.

The old regime kept its FY 2024-25 slabs:

• ₹0 – ₹2,50,000: 0%
• ₹2,50,001 – ₹5,00,000: 5%
• ₹5,00,001 – ₹10,00,000: 20%
• Above ₹10,00,000: 30%

Standard deduction is ₹50,000. The 87A rebate is ₹12,500, capped at ₹5 lakh taxable income. There is no marginal relief in the old regime — at ₹5,00,001 of taxable income, the full ₹12,500 of tax kicks in.

The old regime’s advantage is its deductions: 80C up to ₹1.5 lakh, 80D up to ₹75K (variable by family-age), 80CCD(1B) up to ₹50K, 80CCD(2) employer NPS up to 10% of basic+DA, HRA exemption, Section 24(b) home loan interest up to ₹2 lakh. Stack these and you can shrink your taxable income substantially — sometimes below the old regime’s ₹5L rebate ceiling.

The new regime offers almost none of these. Only the ₹75K standard deduction and Section 80CCD(2) employer NPS (raised to 14% of basic+DA from FY 2024-25) survive.

How the old regime still wins

Take a ₹15 lakh CTC in Mumbai, paying ₹50,000 monthly rent, claiming the full deduction stack: ₹1.5L 80C, ₹50K 80D, ₹2L home loan interest, ₹50K 80CCD(1B).

Under the new regime, the deductions don’t count. Taxable income is ₹12,98,925 (gross taxable of ₹13,73,925 minus the ₹75K standard deduction). Tax: ₹77,833 a year.

Under the old regime, the deductions stack. Gross taxable ₹13,73,925, minus standard deduction ₹50,000, minus HRA exemption ₹5,00,000, minus 80C ₹1,50,000, minus 80D ₹50,000, minus 24(b) ₹2,00,000, minus 80CCD(1B) ₹50,000. Taxable income lands at ₹3,73,925 — below the ₹5L 87A ceiling. Tax: ₹0.

OLD: ₹0 tax. NEW: ₹77,833 tax. The old regime saves you the full ₹77,833 a year. Monthly take-home difference: about ₹6,486.

This is the maximalist case. To get there you need rent in a metro (HRA exemption), home loan interest at the full ₹2L cap (most salaried Indians under 35 don’t have this), and full 80C utilisation through PPF / ELSS / EPF and so on. Most people don’t hit all four levers. Without 24(b) — just the 80C + 80D + HRA combo — the old regime usually loses to new at ₹15L.

The crossover income shifts with deductions. Roughly:

• Under ₹12.75L CTC with no deductions: new regime wins by ₹1L+/yr because old regime taxes everything past ₹5L at 20%+, while new regime taxes nothing
• ₹12.75L–₹20L CTC, partial deductions: usually new wins but the margin narrows
• ₹15L+ CTC, full deductions (rent + 80C + 24(b)): old regime can win
• ₹25L+ CTC, full deductions: depends entirely on whether all four deduction levers fire; without 24(b) the new regime wins

The lever that does most of the heavy lifting in old-regime calculations is the home loan interest. Section 24(b) gives you a ₹2L deduction off taxable income with no caveats. Most salaried Indians under 35 don’t have this. If you do, you’re disproportionately likely to come out ahead under the old regime.

The decision framework

Three scenarios, with engine-computed numbers. Same calculator, three different inputs.

Scenario A: ₹15L CTC in Pune, ₹40,000 monthly rent, no extra deductions. Most renters under 35 in tier-1 Indian cities fit roughly here.

• Old regime annual tax: ₹1,24,465
• New regime annual tax: ₹77,833
• New regime saves you ₹46,632 a year. Monthly take-home difference: ₹3,886.

Scenario B: ₹25L CTC in Mumbai, owns home (no rent paid), full deduction stack — ₹1.5L 80C + ₹50K 80D + ₹2L 24(b) + ₹50K 80CCD(1B). Senior individual contributor or mid-level manager who has cracked the property ladder.

• Old regime annual tax: ₹3,63,442
• New regime annual tax: ₹2,63,868
• New regime still wins by ₹99,574 a year — because without HRA exemption (no rent), the deduction stack alone can’t out-save the new regime’s structurally lower rates at this income.

Scenario C: ₹12,85,001 CTC in Bangalore, no deductions — sitting right at the new-regime marginal-relief cliff.

• Old regime annual tax: ₹1,56,623
• New regime annual tax: ₹0 (full 87A rebate + marginal relief)
• New regime saves you ₹1,56,623 — the largest delta you’ll see at this income band, because the new regime’s rebate hands you a free pass on taxable income just past ₹12L.

The pattern: new regime wins when your deductions are average or low, when you don’t have a home loan, or when your taxable income lands at or below ₹12L. Old regime wins when you have rent, full 80C, 80D, and 24(b) all stacked, especially at incomes ₹15L–₹25L.

What no one mentions about switching regimes

The choice isn’t permanent, but it isn’t fully free either.

If you’re salaried with no business income, you can switch between regimes every financial year when you file your return. There’s no lock-in. You can choose new this year, old next year, new the year after — based on whichever optimises that year’s specific deductions and income.

If you have business income (freelancer, consultant, self-employed), the rules are stricter. Choosing the old regime once locks you into a series of switches limited to one return to the new regime — after which you cannot go back. Section 115BAC(6) covers this. Most salaried Indians don’t need to worry about it; freelancers should plan a regime once and stick with it.

There’s also a TDS angle. Your employer asks you which regime you want at the start of the financial year so they can withhold the right tax monthly. If you change your mind at filing time and switch regimes, you’ll either get a refund or owe additional tax. This is administrative friction, not a tax cost — but it’s worth choosing thoughtfully at the start of the year, especially if you’re close to the marginal-relief band.

The other thing nobody mentions: the new regime’s marginal relief band means the cliff just past ₹12L isn’t a cliff. Taxable income from ₹12,00,001 to about ₹12,70,000 has tax capped at the amount of income above the threshold. At taxable ₹12,10,000, total tax is exactly ₹10,000. At ₹12,50,000, exactly ₹50,000. The brutal cliff that the old regime’s 87A creates at ₹5L — where one rupee above the threshold triggers ₹12,500 of tax — does not exist in the new regime.

So which one

For most salaried Indians earning under ₹15 lakh with rented housing and average deductions, the new regime is the pick. The ₹12L rebate ceiling does most of the work; the structurally lower slab rates do the rest. The exceptions are real but specific: stack a home loan + full 80C + full 80D + HRA exemption and the old regime can claw back the lead at ₹15L–₹20L CTC.

Run the salary calculator with your exact CTC, city, and deductions. The numbers update live. Both regimes appear side-by-side with the winning one marked. If your two numbers differ by less than ₹5,000 a year, the choice barely matters and you can pick the new regime for its lower complexity at filing time. If they differ by more, the calculator picks the right answer for you.

The thing to remember: this is a yearly decision, not a forever one. Pick what wins this year. Re-run the math next year when your rent or deductions or income change.

Frequently asked questions

Is the new tax regime really better for most people?

For salaried Indians earning under ₹15 lakh with rented housing and no home loan, almost always yes. The new regime’s ₹12L 87A rebate eliminates tax for gross salaries up to about ₹12.75L, and the slab rates above that are gentler than the old regime’s. The old regime wins for taxpayers with substantial home loan interest, full 80C utilisation, and full HRA exemption all stacked.

What is the 87A rebate ceiling for FY 2025-26?

Under the new regime, the rebate is up to ₹60,000 for taxable income up to ₹12,00,000. Combined with the ₹75,000 standard deduction, that translates to about ₹12,75,000 of gross salary paying ₹0 tax. Under the old regime, the rebate stays at ₹12,500 for taxable income up to ₹5,00,000 — unchanged from prior years.

Can I switch between regimes every year?

Yes, if you’re salaried with no business income. You declare your choice when you file your return, and you can change it year-over-year. If you have business income, the rules under Section 115BAC(6) restrict your ability to switch back to the old regime once you’ve chosen the new one.

Is HRA exemption available under the new regime?

No. HRA exemption is an old-regime-only deduction. If you live in rented accommodation and the old regime’s HRA exemption is large enough to tip the math, the old regime can win for you. The HRA exemption article walks through the calculation.

What if I’m just above the ₹12 lakh taxable income threshold?

Marginal relief applies. The new regime caps your total tax at the amount of income above ₹12L until the cliff resolves around ₹12,70,000 taxable income. At ₹12,10,000 taxable income, total tax is exactly ₹10,000 — not the full ₹61,500 the slab math would otherwise produce.

Does 80CCD(2) employer NPS work in the new regime?

Yes. Section 80CCD(2) is the only deduction that survives in the new regime, and the cap was raised from 10% to 14% of (basic + DA) starting FY 2024-25 for private-sector employees. The NPS 80CCD(2) article explains why this matters for tech workers.

How does the employer decide which regime to apply during the year?

You declare your regime to your employer at the start of the financial year, usually via a form. The employer withholds TDS based on that declaration. You can change your declared regime when you file your return — if the math now favours the other regime — but it creates a refund or additional tax payment to settle the difference.