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Choosing between the old and new tax regimes is one of the most consequential financial decisions a salaried taxpayer makes each year. The difference in tax liability can run into tens of thousands of rupees, depending on your income level and the deductions you claim. An old vs new tax regime calculator eliminates the guesswork by computing your tax under both systems side by side, using the latest slab rates and rebate provisions for FY 2026-27. Whether you are a first-time taxpayer or someone who has been claiming deductions for years, the calculator tells you exactly which regime puts more money in your pocket.
An old vs new tax regime calculator is a comparison tool. You enter your gross salary, any additional income, and the deductions you are eligible to claim under the old regime. The calculator then applies the relevant slab rates, standard deduction, Section 87A rebate, surcharge, and health and education cess to each regime separately. The output is a clear statement: you save a specific amount if you opt for the new regime, or the old regime is more beneficial by a specific margin.
Without a calculator, most taxpayers either rely on rough mental math or accept the default option without checking. Both approaches carry risk. The new regime is the default, but that does not mean it is always better. For taxpayers with substantial home loan interest, HRA exemption, or Section 80C investments, the old regime can still deliver a lower tax outgo. The calculator resolves that ambiguity with numbers, not assumptions.
The slab rates under both regimes remain unchanged for FY 2026-27. The new regime retains its wider slabs and lower rates, while the old regime holds its familiar three-tier structure for individuals below 60 years of age.
| Income Slab (New Regime) | Tax Rate | Income Slab (Old Regime) | Tax Rate |
|---|---|---|---|
| Up to ₹4,00,000 | Nil | Up to ₹2,50,000 | Nil |
| ₹4,00,001 – ₹8,00,000 | 5% | ₹2,50,001 – ₹5,00,000 | 5% |
| ₹8,00,001 – ₹12,00,000 | 10% | ₹5,00,001 – ₹10,00,000 | 20% |
| ₹12,00,001 – ₹16,00,000 | 15% | Above ₹10,00,000 | 30% |
| ₹16,00,001 – ₹20,00,000 | 20% | — | — |
| ₹20,00,001 – ₹24,00,000 | 25% | — | — |
| Above ₹24,00,000 | 30% | — | — |
The structural difference is stark. Under the old regime, income above ₹10 lakh is taxed at 30%. Under the new regime, that 30% rate applies only above ₹24 lakh. For a taxpayer earning ₹15 lakh, the old regime taxes the entire income above ₹10 lakh at 30%, while the new regime taxes the corresponding portion at 15% and 20%. That gap is the primary reason the new regime wins for most taxpayers who do not claim substantial deductions.
The standard deduction is one of the few deductions available under both regimes. For salaried individuals and pensioners, the new regime offers ₹75,000, while the old regime offers ₹50,000. This flat deduction requires no investment, no documentation, and no eligibility conditions beyond being a salaried taxpayer.
The ₹75,000 deduction under the new regime is particularly powerful when combined with the Section 87A rebate. A salaried employee earning ₹12.75 lakh can have zero taxable income after the standard deduction, and the rebate under Section 87A then eliminates the remaining tax liability. Under the old regime, the same taxpayer would need to claim deductions worth lakhs to achieve a comparable outcome.
The Section 87A rebate is the mechanism that makes low and middle incomes effectively tax-free. Under the new regime, the rebate is capped at ₹60,000 and applies to taxable income up to ₹12 lakh. Under the old regime, the rebate is ₹12,500 and applies to taxable income up to ₹5 lakh.
The practical effect is straightforward. If your taxable income under the new regime, after the standard deduction, is ₹12 lakh or less, you pay no tax. For a salaried employee with a gross salary of ₹12.75 lakh, the standard deduction brings taxable income to ₹12 lakh, and the rebate wipes out the liability entirely. Under the old regime, the same employee would need to claim deductions exceeding ₹7.75 lakh to reach the ₹5 lakh rebate threshold, which is unrealistic for most salaried individuals.
The old regime's advantage lies in its extensive list of deductions and exemptions. If you claim enough of them, the higher slab rates can be neutralised. The following are the most commonly used deductions:
A free income tax calculator lets you input these deductions and see their cumulative impact on your taxable income. The same calculator then compares the result against the new regime's liability, giving you a clear verdict.
The new regime strips away most deductions, but it does not eliminate all of them. The following remain available:
For a typical salaried employee without a let-out property, the employer NPS contribution is the only meaningful deduction beyond the standard deduction. If your employer does not offer NPS, the new regime effectively gives you ₹75,000 and nothing more.
Using the calculator is a three-step process. First, gather your gross salary for the full financial year, including basic pay, HRA, special allowances, bonuses, and any other taxable components. Second, list all deductions you can legitimately claim under the old regime, with documentary evidence for each. Third, enter these figures into an old vs new tax regime calculator and review the side-by-side output.
The calculator applies the slab rates, standard deduction, rebate, surcharge, and cess to each regime. It then reports the tax liability under both and the difference. A positive difference means the new regime saves you money; a negative difference means the old regime is better. The tool also handles marginal relief, which ensures that crossing a slab boundary by a small amount does not result in a disproportionate tax increase.
The break-even point is the deduction amount at which your tax liability under both regimes becomes equal. Below that threshold, the new regime saves more. Above it, the old regime takes the lead.
For a salaried individual earning ₹12 lakh annually, the break-even deduction under the old regime is approximately ₹4.25 lakh. This assumes the standard deduction of ₹50,000 under the old regime and ₹75,000 under the new regime. If your total eligible deductions — HRA, Section 80C, Section 80D, home loan interest, NPS, and others — exceed ₹4.25 lakh, the old regime produces a lower tax outgo. If they fall short, the new regime is the better choice.
For higher incomes, the break-even rises. At ₹18 lakh, the old regime needs roughly ₹5.5 lakh in deductions to match the new regime. At ₹25 lakh, the threshold climbs to about ₹8 lakh. The reason is simple: as income rises, the old regime's 30% rate applies to a larger portion of income, requiring more deductions to offset that higher rate. A tax regime comparison calculator computes this break-even figure automatically for your specific income.
Consider a salaried employee earning ₹12 lakh per year with the following deductions: HRA exemption of ₹60,000, LTA of ₹20,000, professional tax of ₹2,400, Section 80C investments of ₹1.5 lakh, Section 80D premiums of ₹50,000, and Section 80E education loan interest of ₹25,000. Under the old regime, taxable income after all deductions is approximately ₹8.43 lakh, resulting in a tax liability of around ₹84,261. Under the new regime, the standard deduction brings taxable income to ₹11.25 lakh, and the Section 87A rebate eliminates the entire liability. The new regime saves ₹84,261 in this scenario.
Now consider an employee earning ₹25 lakh with substantial deductions: HRA exemption of ₹2 lakh, Section 80C of ₹1.5 lakh, Section 80D of ₹25,000, and home loan interest of ₹2 lakh. Under the old regime, taxable income falls to approximately ₹18.75 lakh, with a tax liability of about ₹3.75 lakh including cess. Under the new regime, the standard deduction brings taxable income to ₹24.25 lakh, with a liability of approximately ₹3.2 lakh. Here, the new regime still saves more, despite the deductions, because the old regime's 30% slab applies to a large income band. The calculator makes these comparisons instantly and accurately.
The answer depends entirely on how much you claim in deductions and exemptions. If you claim deductions exceeding roughly ₹4.5 lakh under the old regime, the old regime can still save you more tax. For everyone else, particularly those earning up to ₹12.75 lakh annually, the new regime typically results in lower or zero tax due to the higher standard deduction of ₹75,000 and the enhanced Section 87A rebate of ₹60,000.
The new tax regime is the default option, but it is not mandatory. Salaried taxpayers can opt out by declaring their choice to their employer at the start of the financial year or by choosing the old regime while filing their income tax return. However, if you have business income, you can switch to the old regime only once.
The standard deduction under the new tax regime stands at ₹75,000 for salaried individuals and pensioners. Under the old regime, it is ₹50,000. This deduction is available without any investment-linked conditions, making it one of the most straightforward tax benefits available.
No. Popular deductions such as House Rent Allowance (HRA), Leave Travel Allowance (LTA), Section 80C (PPF, ELSS, life insurance), Section 80D (health insurance), and Section 80CCD(1B) for NPS are not available under the new tax regime. Only a limited set of deductions, including the standard deduction, employer NPS contribution, and interest on home loan for a let-out property, are allowed.
Gather your gross salary, all eligible deductions under the old regime (HRA exemption, Section 80C, 80D, home loan interest, NPS, etc.), and any other income. Enter these figures into the calculator. It will compute your tax liability under both regimes side by side and show you exactly how much you save by choosing one over the other. Use the reference date of 31 March 2027 for the full financial year.
Under the new tax regime, the Section 87A rebate provides up to ₹60,000 for individuals with taxable income up to ₹12 lakh. Combined with the ₹75,000 standard deduction, this makes income up to ₹12.75 lakh effectively tax-free for salaried employees. Under the old regime, the rebate is capped at ₹12,500 for income up to ₹5 lakh.
Your total tax liability is calculated on your consolidated annual income, not on a per-employer basis. If you switch jobs, ensure you claim the standard deduction only once in your final return. You can claim a total of ₹75,000 under the new regime, even if two Form 16s show the deduction. If the total tax deducted by both employers exceeds your actual liability, you can claim a refund when filing your ITR.
The break-even point is the deduction amount at which your tax liability under both regimes is equal. For a salaried individual earning ₹12 lakh annually, the break-even deduction under the old regime is approximately ₹4.25 lakh. If your eligible deductions exceed this amount, the old regime saves you more. For a ₹25 lakh salary, the break-even rises to about ₹8 lakh in deductions. A calculator automates this comparison for your exact income and deduction profile.
In conclusion, the choice between the old and new tax regimes is not a matter of opinion — it is a matter of arithmetic. The new regime offers lower slab rates, a higher standard deduction, and a generous Section 87A rebate that makes income up to ₹12.75 lakh tax-free for salaried employees. The old regime remains competitive only for those who claim substantial deductions, typically exceeding ₹4.25 lakh at a ₹12 lakh income level. Rather than relying on guesswork or accepting the default blindly, use the old vs new tax regime calculator to run both scenarios with your actual numbers. The calculator will tell you which regime saves you more, and by how much. That is the only reliable way to make a decision that affects your take-home pay for the entire year.