Income Tax Calculator — US, UK, India, Australia & Canada

Each country uses a progressive bracket structure: income is sliced into tiers, and each slice is taxed at the rate published for that tier by the country's tax authority. The calculator above walks those brackets in order, summing the per-bracket tax, and then applies any country-specific credits, surcharges, levies, or cess on top.

United States — IRS, TY 2025

Single-filer brackets per IRS Rev. Proc. 2024-40: 10% up to $11,925, 12% to $48,475, 22% to $103,350, 24% to $197,300, 32% to $250,525, 35% to $626,350, 37% above. Gross income is first reduced by the $15,000 standard deduction; brackets apply to the remainder. FICA (Social Security 6.2% + Medicare 1.45%) and state income tax are separate and not included.

United Kingdom — HMRC, TY 2025/26

England/Wales/NI residents: £12,570 Personal Allowance, then 20% basic rate on the next £37,700, 40% higher rate up to £125,140 of taxable income, 45% additional rate above. The Personal Allowance tapers by £1 for every £2 of income above £100,000 — fully eliminated by £125,140. Scottish rates and National Insurance are out of scope.

India — Income Tax Dept., FY 2025-26 (new regime)

Salaried standard deduction of ₹75,000, then the Finance Act 2025 slabs: 0% / 5% / 10% / 15% / 20% / 25% / 30% at the ₹4L / ₹8L / ₹12L / ₹16L / ₹20L / ₹24L boundaries. Section 87A rebate of up to ₹60,000 drops tax to zero for taxable incomes ≤ ₹12,00,000; marginal relief smooths the jump just above the threshold. Surcharges of 10% / 15% / 25% apply at ₹50L / ₹1Cr / ₹2Cr of taxable income (capped at 25% under the new regime). A 4% Health & Education Cess is levied on (tax + surcharge). Old-regime deductions like 80C and 80D are not available in the new regime.

Australia — ATO, TY 2025-26

Resident brackets after the Stage 3 tax cuts: 0% on the first A$18,200, 16% to A$45,000, 30% to A$135,000, 37% to A$190,000, 45% above. A flat 2% Medicare Levy is applied to taxable income (low- income offsets and surcharge thresholds aren't modelled). HELP/HECS repayments, the Low Income Tax Offset, and superannuation are separate.

Canada — CRA, TY 2025 (federal)

Federal brackets: 15% to $57,375, 20.5% to $114,750, 26% to $177,882, 29% to $253,414, 33% above. The Basic Personal Amount of $16,129 is applied as a non-refundable credit at the lowest federal rate (15%), reducing tax owed by up to $2,419.35. Provincial tax (4%–25% depending on province) and CPP/EI contributions are out of scope.

As a cross-check, the engine also computes base tax by walking the brackets in reverse order — both walks return identical numbers to the cent. The result panel shows “Cross-checked” when the two methods agree within tolerance.

• United States — IRS — Rev. Proc. 2024-40 (Tax Year 2025)
• United Kingdom — HMRC — Income Tax rates and Personal Allowances (TY 2025/26)
• India — Income Tax Dept. — new regime per Finance Act 2025 (FY 2025-26 (AY 2026-27))
• Australia — ATO — Individual income tax rates (residents) (TY 2025-26)
• Canada — CRA — Federal income tax rates (Tax Year 2025)

Brackets, deductions, allowances, credits, and surcharges were last cross-checked against the official sources on 2026-05-11. The page is reviewed at each country's tax-year boundary and after any relevant finance bill or budget.