Income Tax Calculator
Estimate your income tax in the US, UK, or Canada. See the difference between your marginal rate (what you pay on the last dollar) and your effective rate (what you actually pay overall).
Your effective tax rate is always lower than your marginal rate because only income in each bracket is taxed at that rate. US top federal rate: 37%. UK: 45% income tax + 2% NI above £125,140. Canada: 33% federal + up to 25.75% provincial (Quebec).
How Income Tax Works Differently by Country
All three countries use progressive tax systems — higher income is taxed at higher rates — but the structure differs significantly.
🇺🇸 United States — Federal Income Tax
The US federal tax applies to income above standard deductions ($14,600 for single filers in 2024). States add their own income tax on top (0% in Texas and Florida, up to 13.3% in California). FICA (Social Security + Medicare) taxes add another ~7.65% for employees.
🇬🇧 United Kingdom — Income Tax + National Insurance
The UK has both income tax and National Insurance (NI) contributions, which function as separate taxes. The Personal Allowance of £12,570 is tax-free. NI is charged at 12% on earnings between £12,570 and £50,270, then 2% above that — making the combined effective rate higher than it appears from income tax alone.
🇨🇦 Canada — Federal Income Tax
Canada has federal income tax plus provincial/territorial tax. Combined marginal rates in high-income provinces (Ontario, Quebec) can exceed 50% for the highest earners. The Basic Personal Amount ($15,705 in 2024) reduces the tax you owe.
| Feature | 🇺🇸 US | 🇬🇧 UK | 🇨🇦 Canada |
|---|---|---|---|
| Tax-free threshold | $14,600 (std. deduction) | £12,570 (personal allowance) | CA$15,705 (basic personal amount) |
| Top federal rate | 37% | 45% (+2% NI) | 33% |
| State/Provincial tax | Yes (0–13%) | No | Yes (5–26%) |
| Social security tax | Yes (FICA ~7.65%) | NI included above | CPP ~5.95% |
| VAT / Sales tax | State sales tax varies | 20% VAT | GST/HST 5–15% |
* This calculator provides estimates for educational purposes only. Consult a tax professional for your actual tax liability. Tax laws change annually.
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Sources & Methodology
Income tax estimates apply current statutory brackets and standard deductions from each country's tax authority. Figures are simplified estimates, not filing advice.
- U.S. Internal Revenue Service (IRS)
- UK HMRC — Income Tax rates and bands
- Canada Revenue Agency — Canadian income tax rates
- Australian Taxation Office (ATO)
Standards and figures reviewed 2026.