Free Tax Calculator — US 2026 · UK 2025/26 · India FY 2025-26

What This Calculator Does

This is a multi-country income-tax calculator. Drop in a gross annual salary, pick a country (United States, United Kingdom, or India), and the calculator returns the total tax owed for the year, the effective rate, and a full bracket-by-bracket breakdown of where each marginal rupee, pound, or dollar landed. It is the sister calculator to the Take-Home Pay calculator: same tax engine, same official brackets, but the headline number is the slice the government keeps rather than the slice you keep. If your question is “how much will I owe?” rather than “how much do I clear?”, this is the page.

The math is not estimates or rounded approximations. Each country uses the actual statutory bands for the current tax year — IRS-projected federal brackets for 2026, HMRC 2025/26 income-tax and Class 1 NI thresholds for the UK, and the post-Budget 2025 Section 115BAC slabs (with optional old-regime comparison) for India. Each line item in the result corresponds to a specific clause of tax law, not a back-of-envelope average.

The Three Tax Systems Side-by-Side — The Math

Income tax looks the same on the surface in every country — earn money, give the government a slice, keep the rest — but the mechanics differ enough that copy-pasting intuition from one country to another almost always misleads you. A 30% marginal rate in the US, the UK, and India produces three very different effective rates and three very different take-home stories.

• United States. Federal income tax is progressive across seven brackets (10/12/22/24/32/35/37%), applied to taxable income — gross minus the standard deduction (or itemized) and minus any pre-tax 401(k) or HSA contributions. On top of that, FICA payroll tax adds 6.2% Social Security (capped at the wage base) plus 1.45% Medicare on every dollar, with an extra 0.9% Additional Medicare above the filing-status threshold. State income tax is a separate animal entirely — nine states have none, the rest range from 2% to over 13%.
• United Kingdom.The UK uses an income-tax band system over a tax-free personal allowance (£12,570 for most earners) — basic 20% to £50,270, higher 40% to £125,140, additional 45% above. The personal allowance tapers off £1 for every £2 of income over £100,000, which creates a bizarre effective 60% marginal band between £100k and £125,140. Layered on top is National Insurance: Class 1 employee NI is 8% on earnings between £12,570 and £50,270 and 2% above. Income tax + NI together is what most British employees mean by “tax”.
• India. Two regimes coexist. The default new regime (Section 115BAC) uses seven slabs from 0% to 30% with a ₹75,000 standard deduction and a generous Section 87A rebate that fully zeroes tax for anyone with taxable income up to ₹12,00,000. The old regimeuses simpler 0/5/20/30% slabs but lets you claim 80C, 80D, HRA, NPS and other deductions on top of a smaller ₹50,000 standard deduction. A 4% Health & Education Cess applies on the final tax in either regime. The new regime wins for most salaried earners; the old regime wins when total deductions exceed roughly ₹4 lakh.

How to Use This Calculator

1. Pick your country.US, UK, or India. The form rearranges itself so the inputs match the country’s tax structure — filing status only appears for the US, regime selection only for India, and so on.
2. Enter gross annual salary. This is the cost-to-companynumber — your salary before any tax, NI, FICA, or pre-tax deductions. For US: pre-401(k) gross. For UK: contracted annual gross excluding employer pension. For India: CTC excluding employer PF where it’s not part of the headline figure.
3. (US only) Pick a filing status. Single, married filing jointly, married filing separately, or head of household. The brackets and the Additional Medicare threshold both change. Married filing jointly is roughly twice as wide as single at every band — but only one of the two earners is being taxed against this calculator at a time.
4. (India only) Pick a regime. New is default. Switch to old only if you have substantial 80C/80D/HRA deductions to claim — and then drop the lump-sum into the deductions field. The calculator will refuse to apply old-regime deductions on the new regime, because the law refuses to.
5. Read the breakdown.The headline is the total tax owed. The detail rows show federal/income-tax, payroll/NI/cess, the band-by-band split, and your effective rate. The effective rate is what you’ll feel; the marginal rate is what’s on the next dollar of overtime or bonus.

Three Worked Examples

Each example uses the calculator’s real bracket math against the official statutory tables. Plug the same numbers in above to see every detail row.

Example 1 — United States: $100,000 single filer

Gross $100,000, single, no 401(k), no HSA, no state tax. The 2026 single standard deduction is $15,750, leaving taxable income of $84,250. That income climbs through the first three federal brackets:

• 10% on the first $12,225 = $1,222.50
• 12% on the next $37,475 (up to $49,700) = $4,497.00
• 22% on the remaining $34,550 (up to $84,250) = $7,601.00

Federal income tax totals $13,320.50. FICA adds 6.2% Social Security on the full gross ($6,200, since $100k is under the $181k wage base) plus 1.45% Medicare ($1,450) for a FICA total of $7,650. Total federal + FICA tax owed: ≈ $20,970. Effective rate: ~21.0%. After-tax income: about $79,030 — and that is before any state tax, which can knock another $4,000–$8,000 off depending on the state.

Example 2 — United Kingdom: £75,000 (rUK)

Gross £75,000 in England/Wales/N. Ireland. The personal allowance is the full £12,570 — taper only kicks in above £100,000, so this earner is clear of it. Taxable income (post-PA) is £62,430, which crosses into the higher band:

• 20% basic band on £37,700 = £7,540
• 40% higher band on the next £24,730 (up to £62,430) = £9,892
• Total income tax: £17,432

Class 1 employee National Insurance applies separately on the gross: 8% on the band between £12,570 and £50,270 = £3,016, plus 2% on the £24,730 above £50,270 = £494.60, for an NI total of £3,511. Income tax + NI together: ≈ £20,943. Effective combined rate: ~27.9%. The headline difference vs. the US example at a similar absolute gross is roughly seven percentage points — that gap is what funds the NHS and the broader UK welfare state, in cash terms.

Example 3 — India: ₹15,00,000 (new regime)

Gross ₹15,00,000 (₹15 lakh), new regime, salaried. Standard deduction of ₹75,000 brings taxable income to ₹14,25,000. That climbs through four slabs:

• 0% on the first ₹4,00,000 = ₹0
• 5% on the next ₹4,00,000 = ₹20,000
• 10% on the next ₹4,00,000 = ₹40,000
• 15% on the last ₹2,25,000 (up to ₹14,25,000) = ₹33,750

Slab tax totals ₹93,750. Section 87A rebate does notapply — taxable income is above the ₹12,00,000 ceiling. No surcharge (income is well below ₹50 lakh). The 4% Health & Education Cess on ₹93,750 adds ₹3,750. Total tax owed: ₹97,500. Effective rate: ~6.5%.

That sub-7% effective rate at ₹15L is the structural reason most salaried earners in India should default to the new regime: the Budget 2025 rebate, the higher std deduction, and the wider 0% slab combine to produce an effective rate that is roughly a third of what a comparable US or UK earner pays. Crossing the ₹12L taxable line is the cliff — once you’re over it, the rebate vanishes and the slab tax becomes real.

Common Mistakes

• Confusing marginal rate with effective rate.“I’m in the 22% bracket” does not mean 22% of your income goes to tax. The 22% applies only to the slice of taxable income above the previous bracket. Effective rate — total tax divided by gross — is almost always 5–10 percentage points lower than your top marginal rate.
• Forgetting the standard deduction.US, UK, and India all give you a chunk of income tax-free before any brackets fire. A US single filer’s first $15,750 is shielded; a UK earner’s first £12,570; a salaried Indian’s first ₹75,000 (new regime). Tax calculators that skip the standard deduction overstate the bill by 10–25%.
• Treating FICA, NI, and cess as “not really tax”.They come out of your paycheck, they’re mandatory, and they’re what the government collects. FICA in the US, NI in the UK, and the 4% cess in India all belong in any honest accounting of total tax owed.
• Picking the wrong India regime by default. New regime wins for most salaried earners because of the ₹12L 87A rebate and ₹75,000 std deduction. Old regime only wins if your combined 80C + 80D + HRA + NPS + home-loan deductions exceed roughly ₹4 lakh. Run both regimes through the calculator before electing one in your Form 10-IE declaration.
• Ignoring the UK 60% trap. Earnings between £100,000 and £125,140 carry an effective marginal rate of ~60% because the personal allowance tapers away. A £1 raise in this band costs you 40p in higher-rate tax plus a clawback of 50p of PA (taxed at 40% = 20p), for a 60p hit. Pension contributions through salary sacrifice can blunt this — a tax-planning question, not a calculator question.
• Using last year’s brackets.Bands are inflation-adjusted in most years (US/India) or held flat as a stealth raise (UK’s frozen thresholds since 2022). This calculator uses the live tables — re-run it each tax year before building any planning spreadsheet on top.

When This Calculator Decides For You

Tax math feels academic until you realize the output drives a real choice. The four most common decisions this calculator settles:

1. Old regime vs new regime (India). Run both with your actual deductions. If the new regime tax is lower or within ₹5,000, default to it — simpler filing, no 80C lock-up. If old is meaningfully lower, you have a case for parking money in ELSS/PPF/insurance.
2. Single vs married filing jointly (US). If both spouses earn, joint filing usually wins because the brackets are wider — but a high-earning second spouse can push the household into the 32%+ bracket faster than two separate single filers. Run the household total both ways.
3. Whether a raise is worth it.A bonus that crosses you into the next bracket costs you the marginal rate on the new dollars — not your whole income. The calculator’s “before vs after” difference at two gross levels tells you exactly what a raise will deposit, net of tax.
4. Where to live for the same gross. The same $100k role pays differently in California, Texas, and Florida — state tax is the swing factor. The same £75k role pays differently in England vs Scotland (Scottish bands diverge sharply). Run both locations and compare effective rates before relocating.

What This Calculator Doesn’t Model

This is an employment income tax calculator — gross salary in, total income tax + payroll tax out. Several real-world tax situations live outside its scope:

• Capital gains, dividends, and interest income. Each has separate rates and bands in all three countries (US LTCG at 0/15/20%, UK CGT at 18/24%, India STCG/LTCG at 15%/12.5%). Use a dedicated capital-gains calculator if those dominate your income.
• Self-employment / contractor tax.US Schedule SE adds 15.3% self-employment tax (vs FICA’s 7.65% employee share); UK Class 2 + Class 4 NI replaces Class 1; India presumptive taxation under 44ADA changes the picture entirely. The calculator assumes W-2 / PAYE / salaried employment.
• Itemized deductions (US). Mortgage interest, SALT, charitable giving can exceed the $15,750 standard deduction for high-income homeowners in high-tax states. The calculator uses the standard deduction only; itemizing requires a full Schedule A.
• Salary sacrifice / pension contributions (UK). Employer pension schemes can shift gross down before tax + NI fire — a powerful lever for the £100k+ taper band. Out of scope here.
• Scottish income tax.Scotland diverges from rUK with starter, basic, intermediate, higher, advanced, and top rates running 19/20/21/42/45/48%. The UK path of this calculator uses rUK bands. Scottish residents should use HMRC’s Scotland-specific tool.
• Surcharge marginal relief (India). The calculator applies surcharge at the bracketed rate. Real 87A and surcharge marginal-relief provisions can shave a few thousand off in narrow income windows just over each threshold. Net effect: tax shown here is at most slightly conservative.
• State / local / city tax (US). Out of scope unless you enter a flat state rate. NYC and a few other cities add municipal income tax on top of state — not modeled here.

For the take-home flip side of this same math, see the Take-Home Pay calculator. To convert an annual salary into hourly equivalents, use Salary to Hourly. And to see how much of your nominal hourly rate evaporates to commute and unreimbursed work expenses, try the True Hourly Rate calculator — the tax this calculator returns is only one of the several layers between your headline salary and the dollars you actually spend.