Old vs new tax regime: which one should you actually choose?

If you're salaried in India, this question shows up twice a year: once in April, when your employer asks you to declare a regime for TDS, and again at ITR filing time, when you can actually change your mind. And most people answer it the same lazy way both times — by picking whatever they picked last year, or whatever a friend or colleague did. That's a genuinely costly habit, because the 'right' regime isn't a personality trait, it's a maths problem, and the answer depends entirely on your income level and how much you actually claim in deductions. The rules have also changed meaningfully over the last two Union Budgets, so an answer that was correct for you two years ago may no longer be correct today. Here's how both regimes actually work right now, a real example with numbers, and a simple way to work out your own answer instead of copying someone else's.

First, the headline: the new regime is now the default

Since FY 2023-24, the new tax regime is the default option for every taxpayer in India — if you don't actively choose otherwise, your employer will deduct TDS assuming you're in the new regime. The old regime still exists and is still completely legal to choose, but you (or your employer, on your instruction) now have to opt into it rather than opt out of it. For salaried individuals, this choice isn't permanent either way — you can pick a different regime every single financial year when you file your return, regardless of what you declared to your employer during the year. That flexibility matters, because your ideal regime can genuinely shift as your income, investments, or loans change.

The new regime's slabs (FY 2025-26 / AY 2026-27)

Budget 2025 widened the new regime's slabs meaningfully. Income up to ₹4 lakh is tax-free, ₹4–8 lakh is taxed at 5%, ₹8–12 lakh at 10%, ₹12–16 lakh at 15%, ₹16–20 lakh at 20%, ₹20–24 lakh at 25%, and anything above ₹24 lakh at 30%. Salaried employees and pensioners also get a flat standard deduction of ₹75,000 with no bills or proof needed. On top of that, Section 87A gives a full tax rebate (up to ₹60,000) to anyone whose total taxable income is ₹12 lakh or less — which in practice means a salaried person earning up to roughly ₹12.75 lakh a year (after the standard deduction) can end up paying zero income tax under the new regime.

The old regime's slabs — and what it still lets you claim

The old regime's slabs are unchanged and simpler: nil up to ₹2.5 lakh, 5% from ₹2.5–5 lakh, 20% from ₹5–10 lakh, and 30% above ₹10 lakh, with a smaller standard deduction of ₹50,000 and its own, smaller 87A rebate (full rebate only up to ₹5 lakh taxable income). Higher slab rates are the trade-off for what the old regime keeps that the new one drops entirely: Section 80C (up to ₹1.5 lakh for PPF, ELSS, EPF, life insurance premiums, and more), Section 80D (health insurance premiums), HRA exemption if you pay rent, home loan interest deduction under Section 24(b) (up to ₹2 lakh for a self-occupied property), and an extra ₹50,000 for NPS contributions under Section 80CCD(1B). None of these reduce your taxable income under the new regime.

Why ₹12 lakh is the number everyone keeps talking about

This is the single biggest reason the new regime has become the default winner for a large share of salaried India: the 87A rebate effectively zeroes out tax for anyone with total taxable income up to ₹12 lakh under the new regime, no matter how the old regime's deductions would have played out for them. There's also a lesser-known 'marginal relief' rule that smooths the edge of this cliff — if your income is just above ₹12 lakh, the extra tax you owe is capped at the amount by which you crossed the threshold, so you never end up worse off than someone earning exactly ₹12 lakh by a wide margin. Below this income band, most people simply don't have enough legitimate deductions available to make the old regime's higher slab rates worth choosing.

So which one actually wins? A real worked example

Numbers make this concrete. Take someone earning ₹15 lakh a year — above the rebate zone, where the comparison gets genuinely interesting. Under the new regime, after the ₹75,000 standard deduction, their tax works out to roughly ₹97,500 (including cess) — fixed, regardless of their investments or rent. Under the old regime with only the standard deduction and no other claims, the same salary is taxed at roughly ₹2,57,400 — far worse. But add real, honest deductions: with about ₹4 lakh claimed (a full 80C, some 80D, and partial HRA or home loan interest), it drops to roughly ₹1,48,200 — still worse than the new regime. Only once combined deductions climb to around ₹6 lakh (a maxed 80C, 80D, NPS, and a meaningful home loan interest claim) does the old regime catch up, landing at roughly ₹96,200 — finally on par with the new regime.

The rough rule of thumb — and why it's only a starting point

A commonly repeated shortcut is: if your combined, genuinely-claimable deductions (80C + 80D + NPS + HRA + home loan interest) comfortably cross roughly ₹4–5 lakh, it's worth running the old regime numbers seriously. Below that, the new regime usually wins outright. But this is a rough starting point, not a formula — the exact breakeven shifts with your income level, as the worked example above shows (at ₹15 lakh, the real crossover was closer to ₹6 lakh, not ₹4 lakh). The only way to know your actual number is to add up what you can genuinely claim — not what you'd like to claim — and compute both.

When the new regime almost always wins

The new regime tends to be the better pick if you're a first jobber or early in your career without a home loan yet, if you don't pay rent that qualifies for HRA (living with family, or your employer doesn't structure HRA into your salary), if your 80C investments are minimal or inconsistent, if your total income sits comfortably under ₹12–15 lakh, or if you're a freelancer or gig worker without employer-linked deductions. For a large share of India's younger, salaried workforce, this describes their situation closely, which is exactly why the new regime was made the default in the first place.

When the old regime can still make sense

The old regime tends to pull ahead once you have a genuinely large, real deduction stack: a home loan with substantial annual interest (especially in the early years of a long tenure, when interest dominates the EMI), HRA in an expensive metro city, a maxed-out 80C (₹1.5 lakh) combined with 80D health insurance and the extra ₹50,000 NPS contribution under 80CCD(1B), and typically a higher income band where the new regime's lower slabs no longer make up the gap on their own. If most of these apply to you simultaneously, it's genuinely worth running both calculations rather than assuming the new regime automatically wins just because it's the default.

You're allowed to switch — with one asterisk

If you're purely salaried (no business or professional income), you can choose a different regime every single financial year, with no restrictions and no need to justify the switch. What you declared to your employer for TDS purposes in April doesn't lock you in — you can pick the other regime when you actually file your ITR, and any excess tax deducted gets refunded. The one exception is for people with business or professional income: once you switch back from the new regime to the old regime, you get only one such switch back in your lifetime for that income source — after that, you're locked into the new regime going forward. Salaried employees don't face this restriction at all.

How to actually decide for yourself

Skip the guesswork. Write down your gross annual income, then honestly total up what you'd actually claim under the old regime — your real 80C investments (not the ₹1.5 lakh ceiling if you don't actually invest that much), your actual health insurance premium, your actual annual home loan interest, and your actual HRA-eligible rent. Compute the tax both ways using the current slabs above, or a tax calculator, and compare the two final numbers directly — not the deduction total, the actual tax payable. Knowing your real numbers matters here just as much as it does anywhere else in personal finance — if you're not sure how much you're really investing or spending in a typical month, the free Rupix Finance Tracker (which works offline and keeps your data on your device) makes it easy to see your actual figures instead of estimating from memory before you commit to a regime for the year.

The one-line takeaway

There's no universally 'better' regime — only a better regime for your specific numbers this specific year, and it's worth ten minutes of real arithmetic to get it right rather than defaulting to whatever you picked last time. Tax rules can also shift with every Union Budget, so treat this comparison as a snapshot of FY 2025-26 rules, revisit it each year, and when your situation is genuinely complex — multiple income sources, a business, or large one-off deductions — a qualified CA is worth the consultation fee before you file.