Figures below use the Tax Year 2026-27 rate framework under the Income-tax Act, 2025. Assessment Year 2026-27 is a different preceding period covering FY 2025-26 under the Income-tax Act, 1961. Budget 2026 confirms the headline new-regime slab rates are the same across the transition, but the governing Act and terminology are different.
The regime choice in one view
For most salaried taxpayers, the new regime results in lower tax under current slabs — it usually takes a genuinely large deduction base to make the old regime cheaper, not just a maxed-out 80C. At ₹15 lakh income, for instance, it takes roughly ₹5,43,750 in additional eligible deductions — on top of the old regime's own ₹50,000 standard deduction, which applies automatically and isn't part of that figure — before the old regime actually wins. That's a combined reduction of about ₹5,93,750 from gross salary in total, far more than 80C alone (capped at ₹1,50,000) can provide.
This isn't true at every income level or for every taxpayer, which is what the rest of this article works through.
Why the new regime wins by default now
The new regime is the default option since a few years back — you have to actively opt into the old regime if you want it. Structurally, the two differ in a specific trade-off:
- New regime: lower slab rates, a ₹75,000 standard deduction, and a rebate that makes income up to ₹12 lakh effectively tax-free. Most of the common deductions and exemptions available under the old regime — 80C, 80D, HRA exemption, home loan interest on a self-occupied property — are not available under the new regime, though specified deductions (such as the standard deduction itself and employer NPS contributions under 80CCD(2)) remain available.
- Old regime: higher slab rates and a smaller ₹50,000 standard deduction, but access to the full range of Chapter VI-A deductions if you have investments, insurance, a home loan, or rent to claim against.
The new regime's rate cuts were deliberately set low enough that, for most people, they beat what even fairly aggressive old-regime deduction claims can achieve.
How much deduction it actually takes to flip the outcome
This is the number that actually matters for the decision, and it's higher than most people expect:
| Income | Additional eligible deductions needed (beyond the automatic standard deduction) |
|---|---|
| ₹15,00,000 | approximately ₹5,43,750 |
| ₹20,00,000 | approximately ₹7,08,333 |
At ₹15 lakh income, even a maxed-out 80C (₹1,50,000) plus a full 80D (₹25,000) — a combined ₹1,75,000 — only brings old-regime tax down to ₹2,02,800, still nearly double the new regime's ₹97,500. Reaching the roughly ₹5,43,750 in additional deductions that actually flips the result typically requires a substantial home loan interest claim (up to ₹2,00,000 under Section 24(b)) stacked on top of 80C, 80D, and often HRA exemption too — several large, genuinely-used deductions compounding together, not just one.
Who is most likely to still benefit from the old regime
Someone with a large, active home loan on a self-occupied property, where the ₹2 lakh Section 24(b) interest deduction alone is a meaningful chunk of the gap.
Someone claiming HRA exemption on genuinely high rent, particularly in a metro city where the exemption ceiling is higher.
Someone with multiple large deductions simultaneously — 80C fully used, meaningful 80D, home loan interest, and HRA all together, rather than any single one in isolation.
If none of these apply to you, the new regime is very likely cheaper, and the calculation is also considerably simpler — fewer things to track and declare.
What doesn't change between the two regimes
Your income itself. Neither regime changes what counts as taxable income beyond the specific deductions available — salary, interest, rental and other income are treated the same way structurally, just taxed at different net rates once regime-specific deductions are applied.
Surcharge and cess mechanics, which apply under both regimes using the same thresholds, though the new regime caps surcharge at 25% even above ₹5 crore, while the old regime rises to 37%.
The requirement to actually file a return, regardless of which regime results in lower tax.
Common mistakes when choosing a regime
For the exact numbers behind the salary cases, jump to the ₹10 lakh and ₹15 lakh worked examples below. They are kept inside this comparison so the assumptions and regime logic stay in one place.
Assuming the regime that was better last year is still better this year. Slab rates and the rebate threshold have changed in recent years — a comparison based on old figures can point the wrong way now.
Using only 80C in the comparison and ignoring HRA, home loan interest, and 80D. As shown above, 80C alone rarely closes the gap — the old regime typically only wins with several deductions combined.
Switching regimes without re-checking every year. Salaried individuals without business income can choose either regime freely each year when filing — it's worth re-running the comparison annually rather than assuming last year's choice still holds, especially after a raise or a new home loan.
How to make this decision for your own numbers
Enter your actual salary, any other income, and your real (not hypothetical) deductions — 80C, 80D, home loan interest, and HRA exemption if applicable — on the Income Tax Calculator to see both regime's exact tax liability side by side, rather than relying on a general rule of thumb that may not match your specific deduction level.
Two salary examples absorbed into this comparison
For Tax Year 2026-27, a salary-only illustration of ₹10 lakh, after the applicable standard deduction used in the calculator and with no other income, can result in nil tax under the new regime because the current rebate provision can eliminate slab tax at the relevant total-income level. Under the Income-tax Act, 2025 this rebate is in Section 156; Section 87A is the familiar reference from the repealed 1961 Act. The same gross salary under the old regime with no eligible deductions can produce a material tax bill.
At ₹15 lakh salary, using the same salary-only simplification and no old-regime deductions, the new regime can still be materially cheaper. The useful lesson is not the exact gap from one example; it is that the old regime only becomes competitive when the taxpayer has enough actually eligible deductions/exemptions to offset its older slab structure.
| Salary example | Best use of the example |
|---|---|
| ₹10 lakh | Understand how the new-regime rebate can eliminate tax at qualifying income levels. |
| ₹15 lakh | Estimate how large the old-regime deduction base would need to be before the comparison changes. |
Frequently asked questions
Can I switch back to the old regime after choosing the new one?
Salaried individuals with no business income can choose either regime freely each year when filing. Those with business or professional income face restrictions on switching back to the old regime after opting for the new one in certain circumstances.
Does the new regime allow any deductions at all?
A few — mainly the ₹75,000 standard deduction for salaried/pensioners and employer NPS contributions under Section 80CCD(2). The popular deductions (80C, 80D, HRA exemption, home loan interest) are not available under the new regime.
Is the old regime ever better for someone with no deductions at all?
No — with zero deductions, the new regime's lower slab rates and higher rebate threshold make it cheaper at every income level, since the old regime has no offsetting deduction benefit to make up the rate difference.
Does age affect which regime is better?
It can, indirectly — the old regime gives senior and super-senior citizens a higher nil-rate threshold, which the new regime doesn't offer regardless of age. This can tilt the comparison toward the old regime for older taxpayers with modest deductions, more than it would for a younger taxpayer with the same deduction level.