Skip to content
ToolBoxGenie

Income Tax Calculator

Calculators · Added 14 August 2026

Enter your income and this calculator works the tax out under both regimes, itemised so every step can be checked: the standard deduction, tax slab by slab, the section 87A rebate, marginal relief where the income just crosses a threshold, surcharge and the 4% cess. It covers FY 2024-25 and FY 2025-26, and names the date those rates were checked.

Rates last checked against the Finance Act on 2026-08-14.

Salary and other ordinary income, before any deduction.

Tax regime

The new regime does not allow these, so this field is ignored while it is selected.

How to use the income tax calculator

  1. 1Pick the financial year. The list holds only years whose rates have been verified against the Finance Act — the verification date is shown under the field.
  2. 2Enter your gross annual income, before any deduction.
  3. 3Choose a regime, or read the comparison panel that shows both.
  4. 4Enter the deductions you actually claim. The new regime disallows them, so the field is ignored while it is selected — that is the point of the comparison.
  5. 5Press Calculate. Open the slab-by-slab working to see exactly where each rupee of tax came from.

Examples

The headline zero-tax salary

Input
₹12,75,000 gross salary, FY 2025-26, new regime
Result
₹0 — the standard deduction brings taxable income to ₹12,00,000 and the 87A rebate wipes out the ₹60,000 of slab tax

This is where the widely quoted '₹12.75 lakh is tax-free' figure comes from. It applies to salary, because it depends on the ₹75,000 standard deduction.

Just over the rebate threshold

Input
₹12,85,000 gross salary, FY 2025-26, new regime
Result
₹10,400 — slab tax of ₹61,500 is cut to ₹10,000 by marginal relief, plus cess

Without marginal relief, ₹10,000 more income would cost ₹61,500 in tax. The Act prevents that, and calculators that omit it get this badly wrong.

Where the old regime still wins

Input
₹15,00,000 salary with ₹1,50,000 of deductions, FY 2025-26
Result
Old regime ₹2,10,600 against new regime ₹97,500 — the new regime is lower here

It takes a great deal more in deductions before the old regime catches up. Raise the deductions figure and watch the comparison flip.

About the income tax calculator

How the tax is actually assembled

Income tax is not one calculation but a sequence, and the order is fixed by the Act. Deductions come off first — the standard deduction against salary, then Chapter VI-A claims if the regime allows them — to give taxable income. That figure is then run through the slabs, where each band taxes only the income falling inside it. A common misreading is that crossing into the 30% band taxes everything at 30%; it does not, and the slab-by-slab table on this page exists to make that visible.

Then come the adjustments. The section 87A rebate can wipe out the tax entirely for incomes under the threshold. Surcharge is added for high incomes, at a rate that steps up through bands and is capped at 25% in the new regime against 37% in the old. Finally the 4% Health and Education Cess applies to tax plus surcharge — not to income, which is why it is a small number that people frequently misplace.

Marginal relief sits at the two thresholds and is the piece most calculators skip. Both the rebate limit and each surcharge band have a zone just above them where the extra tax would exceed the extra income. The Act limits the liability in that zone, and without it the numbers just past ₹12 lakh or just past ₹50 lakh are simply wrong.

Why the regime choice is not obvious

The new regime offers lower rates and a wider zero band, and takes away almost every deduction in exchange. The old regime keeps the deductions and charges more on what is left. Which comes out ahead depends entirely on how much you actually claim — not how much you could claim in principle, which is where most people's mental arithmetic goes wrong.

The practical test is to enter your real deductions, not aspirational ones. A ₹1.5 lakh 80C that is genuinely invested counts; one you intend to make before March does not, until you make it. Add HRA only if you actually pay rent and have the documentation. Then read the comparison panel, and try raising the deduction figure to find the point where the two regimes cross — that number tells you how much more you would need to be claiming for the old regime to be worth it.

One structural point is worth knowing: the new regime is now the default. If you want the old one you elect it, and for salaried taxpayers that election can generally be revisited each year. That makes this a decision to re-run annually rather than settle once, particularly in any year your deductions change materially.

Frequently asked questions

Which financial years does this cover?
FY 2024-25 and FY 2025-26. Later years are deliberately absent rather than estimated, because slabs are set by each Union Budget and inventing numbers for an unverified year would put a confident-looking wrong answer on a page about somebody's tax bill. The rate table lives in one file and is designed so a new year is a single entry with the date it was checked.
Which regime should I pick?
The calculator shows both on your figures, which is the only honest way to answer it. As a rule of thumb the new regime wins unless you have substantial deductions — a large 80C, significant HRA, a home loan interest claim. The break-even point moves with income, so check it rather than relying on a threshold someone quoted.
What is marginal relief and why does it matter?
It stops a small increase in income causing a disproportionate jump in tax at a threshold. Crossing the 87A rebate limit by ₹10,000 would otherwise cost ₹61,500; relief caps the extra tax at the extra income. The same principle applies where income crosses a surcharge band. Both are modelled here, and both are commonly omitted elsewhere.
What does it not handle?
A fair amount, all stated on the result. It assumes a resident individual below 60 with salary and other ordinary income. It does not model capital gains, which are taxed at special rates outside the slabs; business or presumptive income; the higher basic exemption for senior and super-senior citizens; or relief under sections 89, 90 and 91.
Is my income data sent anywhere?
No. The whole calculation runs as JavaScript in this browser tab. There is no upload endpoint on this site, nothing is logged and nothing is stored — which is the property you want from anything you type a real salary into.

Related tools