Old Tax Regime vs New Tax Regime: How to Actually Decide Which Saves You More

Every year around this time, the same question comes up in every WhatsApp family group and office chat: old regime or new regime? The honest answer is that it depends on your specific deductions, and it can flip from one year to the next if the government revises slabs in the Union Budget. Here is how to actually work out which one is cheaper for you, with real numbers and a framework you can re-run every year.

What are the old and new tax regimes? #

India currently runs two parallel income tax structures. The old tax regime has higher tax rates but lets you claim a long list of deductions and exemptions: Section 80C (₹1.5 lakh), HRA, home loan interest under Section 24(b), 80D for health insurance, and more.

The new tax regime has lower tax rates and wider slabs, but it removes almost all deductions and exemptions, keeping only a few like the standard deduction and employer's NPS contribution. Since FY 2023-24, the new regime has been the default option, meaning you are taxed under it unless you actively choose the old regime while filing your return.

Why you cannot just reuse last year's comparison #

The government revises tax slabs, rebate limits, and the standard deduction through the Union Budget most years, and these changes can be significant. For example, the new regime's slabs and Section 87A rebate limit changed substantially between FY 2024-25 and FY 2025-26. A regime comparison you did a year or two ago can go stale quickly, so always check the current financial year's slabs before deciding, either on the official Income Tax Department website or through an updated calculator, rather than assuming last year's numbers still apply.

A worked example, using a recent year's slabs #

To show the method, here is a real comparison using the FY 2025-26 slabs as a concrete, recent example. Swap in whatever the current year's actual slabs are when you run your own numbers; the steps below stay the same regardless of which year's rates you use.

New tax regime (FY 2025-26, for illustration):

That year, a Section 87A rebate made tax payable nil for taxable income up to ₹12,00,000 under the new regime. Add the ₹75,000 standard deduction for salaried employees, and a gross salary up to about ₹12,75,000 meant zero tax under the new regime that year.

Old tax regime (has stayed unchanged across several recent years):

The old regime's Section 87A rebate applies only up to ₹5,00,000 taxable income, and the standard deduction is ₹50,000.

How to actually compare the two: a real example #

Meera, a 32-year-old product manager in Hyderabad, earns a gross salary of ₹15,00,000 a year. Using that same FY 2025-26 illustration, here is how her tax compares under both regimes.

Under the new regime: her only deduction is the ₹75,000 standard deduction, so taxable income is ₹14,25,000. Applying the slabs above: nil on the first ₹4 lakh, 5% on the next ₹4 lakh (₹20,000), 10% on the next ₹4 lakh (₹40,000), and 15% on the remaining ₹2,25,000 (₹33,750). That is ₹93,750 before cess, or roughly ₹97,500 after the 4% health and education cess.

Under the old regime: Meera claims the ₹50,000 standard deduction, ₹1,50,000 under Section 80C (EPF plus ELSS), and ₹50,000 under Section 80CCD(1B) for NPS, bringing her taxable income to ₹12,50,000. Tax works out to nil on the first ₹2.5 lakh, 5% on the next ₹2.5 lakh (₹12,500), 20% on the next ₹5 lakh (₹1,00,000), and 30% on the remaining ₹2.5 lakh (₹75,000). That totals ₹1,87,500 before cess, or roughly ₹1,95,000 after cess.

At this deduction level, the new regime saves Meera about ₹97,500 a year. You can run this kind of comparison with the current year's actual slabs on the Income Tax calculator, or get the same verdict instantly on the Old vs New Tax Regime calculator.

Now change one thing: suppose Meera pays ₹25,000 a month rent and also has a home loan on a second property, giving her an HRA exemption of ₹3,00,000 and a Section 24(b) home loan interest deduction of ₹2,00,000, on top of her existing 80C and NPS deductions. Her old regime taxable income drops to ₹8,00,000, and her tax falls to roughly ₹75,400 after cess. In this version, the old regime wins, saving her about ₹22,100 compared to the new regime's fixed ₹97,500.

The lesson: whether the new regime or old regime is cheaper depends entirely on how much you can actually claim in exemptions and deductions, not on which one "sounds" simpler, and not on what won last year.

When each regime tends to win #

• New regime tends to win if you do not pay rent, do not have a home loan, and invest only a little in 80C instruments, or if your income is under the current rebate threshold, where the rebate can wipe out your tax entirely.
• Old regime tends to win if you have a meaningful HRA claim, an ongoing home loan with significant interest, and you max out 80C, 80D, and NPS deductions, especially at higher income levels.
• The breakeven point generally falls somewhere between ₹3.5 lakh and ₹4.5 lakh of total deductions (standard deduction plus 80C plus HRA plus any others combined), below which the new regime usually wins, and above which the old regime starts to catch up or win. The exact breakeven shifts whenever slabs are revised, so re-check it against the current year's numbers.

Common mistakes and myths #

Myth 1: The new regime is always simpler, so it is always better. Simpler does not mean cheaper. If you have significant HRA or home loan interest, the old regime can still save you more even with the effort of tracking documents.

Myth 2: You are locked into one regime for life. Salaried individuals can switch between the old and new regime every financial year when filing returns. Only those with business or professional income face restrictions on switching back and forth.

Mistake: Not informing your employer of your chosen regime. If you do not declare your regime preference to your employer, they default to the new regime for TDS purposes. You can still choose differently while filing your return, but it may mean a refund claim instead of correct TDS through the year.

Mistake: Comparing regimes using an old year's slabs. The new regime's slabs and rebate limit have changed meaningfully in some recent years, for example between FY 2024-25 and FY 2025-26. A comparison you did a year or two ago is not safe to reuse; always recompute with the current financial year's numbers before deciding.

Mistake: Ignoring employer NPS contribution. Employer contributions to NPS under Section 80CCD(2) are deductible under both regimes, up to prescribed limits. This is one of the few deductions still available in the new regime and is often overlooked.

Tips for choosing the right regime #

1. List every deduction you can genuinely claim, not just the ones you plan to. Unused 80C room or an HRA exemption you cannot actually document does not help you.
2. Recalculate every financial year, especially if your rent, home loan status, or investment habits change, or if slabs are revised in that year's budget.
3. Use the actual numbers from your Form 16 or salary structure, not rough estimates, and the current year's official slabs, when comparing on the Old vs New Tax Regime calculator or the Income Tax calculator.
4. Check your HRA exemption precisely using the HRA calculator before assuming it favours the old regime; the exemption formula is not simply your full rent paid.
5. Review your 80C and other investments with the Tax Saving calculator to see whether you are already maximising deductions that make the old regime worthwhile.

Related tools for your tax planning #

Choosing a regime is only one part of tax planning. If a large chunk of your old-regime deductions comes from PPF or NPS contributions, the PPF calculator and NPS calculator can show how those investments grow alongside their tax benefit. If you are deciding how much rent you can claim exemption on, start with the HRA calculator before running the full comparison on the Income Tax calculator.

Frequently asked questions #

Which tax regime is the default? #

The new tax regime is the default. If you do not explicitly opt for the old regime while filing your income tax return, or inform your employer at the start of the year, your tax will be computed under the new regime.

Can I switch regimes every year? #

Salaried individuals without business income can choose a different regime each financial year when filing their return. Those with income from business or profession have more restricted switching rules and should check current provisions before assuming they can switch freely.

Is there a rebate that makes lower incomes tax free under the new regime? #

Yes. The new regime carries a Section 87A rebate that brings tax payable down to nil below a threshold taxable income, and that threshold has moved up over recent budgets (it stood at ₹12,00,000 for FY 2025-26, for example). Check the current financial year's rebate limit before assuming a specific number still applies.

Does the new regime's rebate apply to the old regime too? #

No. The old regime's Section 87A rebate has stayed capped at ₹5,00,000 taxable income for several years, unlike the new regime's rebate limit, which has moved up. This gap is one of the biggest reasons the new regime tends to look more attractive for lower and middle incomes.

What deductions can I still claim under the new regime? #

The new regime allows the standard deduction, employer's contribution to NPS under Section 80CCD(2), and a few other limited exemptions like transport allowance for specified employees. Popular deductions like 80C, HRA, and home loan interest under Section 24(b) for a self-occupied property are not available under the new regime.

Work out your own comparison #

Slab rates and rebate limits get revised often enough that a decision you made a year or two ago is worth revisiting. Gather your actual salary structure, rent, home loan interest, and planned 80C investments, then run both scenarios through the Income Tax calculator, using the current financial year's slabs, to see which regime actually keeps more money in your pocket this year.