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Find out exactly how much income tax you owe in FY 2026-27 — in one click. Enter your salary, and this free calculator shows your tax under the New Regime vs Old Regime side by side, with a full slab-wise breakup, monthly tax, and the Section 87A rebate. No signup, no server — the calculation runs entirely in your browser.
Built for Indian salaried taxpayers, freelancers and small business owners who want a quick, honest answer before filing — not a 20-field form.
index.html, style.css, app.js, README.txt — pure HTML/CSS/JS, zero dependencies, zero build step. Open index.html and it works. The tax engine in app.js is fully unit-tested (₹12L salary → ₹0 tax, ₹15L → ₹97,500 new vs ₹2,10,600 old, ₹25L → ₹3,19,800, marginal-relief and surcharge cases verified).
1. Open index.html in any browser. 2. Enter your gross annual salary and other income. 3. Add your old-regime deductions (80C, HRA) to compare fairly. 4. Click "Calculate My Tax" — your winner regime, slab breakup and monthly tax appear instantly.
Slabs: 0–₹4L nil | ₹4–8L 5% | ₹8–12L 10% | ₹12–16L 15% | ₹16–20L 20% | ₹20–24L 25% | above ₹24L 30%. Standard deduction ₹75,000 (new) / ₹50,000 (old). Figures are estimates for planning — verify with a CA before filing.
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