Income Tax Calculator
Free online income tax calculator. No sign-up, no installation. Runs entirely in your browser.
Method: Based on progressive tax brackets: tax = Σ(income in each bracket × its rate); effective rate = tax ÷ total income.
Calculate Your Tax
What is This Calculator?
The Income Tax Calculator provides a quick estimate of your income tax liability based on simplified tax brackets for five major regions: the United States, Taiwan, the United Kingdom, Australia, and Canada. It uses a progressive tax system where different portions of your income are taxed at different rates.
This tool calculates:
- Income taxed: The income you enter, minus any additional deductions you add
- Total Tax: Sum of tax owed across all brackets
- Effective Tax Rate: Total tax divided by the income you entered (%)
- Marginal Tax Rate: Tax rate on your highest dollar of income (%)
- After-Tax Income: The income you entered minus total tax
How to Use
- Select your region: Choose the country/region where you live or earn income
- Choose filing status: Select "Single" or "Married Filing Jointly" (affects bracket thresholds)
- Enter your income: the figure differs by region — US/CA/TW: enter taxable income (after your standard deductions/exemptions); UK/AU: enter total income (the tax-free band is built into the brackets)
- Additional deductions (optional): Leave blank for 0, or enter any extra deductions to subtract
- Click Calculate: View your tax breakdown by bracket and key metrics
Note: This is a simplified estimate. Actual tax liability depends on many factors not covered here (credits, adjustments, state/provincial taxes, etc.). Consult a tax professional for accurate filing.
Common Use Cases
- Salary Planning: Estimate how a raise or bonus will affect your after-tax income
- Freelance/Self-Employment: Get a rough idea of tax owed on new income streams
- International Comparison: See how tax rates differ across five major economies
- Budget Planning: Determine expected tax liability for annual budgeting
- Tax Education: Understand how progressive tax brackets work visually
Frequently Asked Questions
Are the tax brackets current?
The brackets were verified on 2026-07-19 from each jurisdiction's official tax authority, all for the 2026 income year: US IRS (2026 tax year), Canada CRA (2026), UK GOV.UK (2026/27), Australia ATO (2026-27 financial year — the first rate was cut from 16% to 15%), and Taiwan's Ministry of Finance (assessment year 115 / 2026). The UK calculation includes the Personal Allowance taper for incomes over £100,000. Real tax systems still involve many deductions, credits, and special rules this tool does not model, and rates change yearly — for accurate planning, consult a certified accountant or your local tax authority.
What is the difference between effective and marginal tax rate?
Effective rate: Your actual tax burden as a percentage of the income you entered. Marginal rate: The tax rate on your last dollar earned. Due to progressive brackets, your marginal rate is always higher than or equal to your effective rate.
Does this include state, provincial, or local taxes?
No. This calculator shows only federal/national income tax. State, provincial, and local taxes vary widely and are not included. Check your local tax authority for additional taxes.
How does the deduction field work?
Enter the income the brackets apply to (US/CA/TW: taxable income after your standard deductions/exemptions; UK/AU: total income — the allowance/tax-free threshold is the 0% band) in the income field, and the brackets apply to it directly. The optional "Additional deductions" field defaults to 0; use it only if you want to subtract further deductions first.
What if I earn in multiple countries?
This calculator handles one region at a time. If you have income in multiple countries, calculate each separately and consult a tax professional about foreign tax credits and reporting requirements.
Is my data saved or shared?
No. All calculations happen in your browser. Your income and personal information are never sent to any server or shared with anyone.
⚠️ Disclaimer: This calculator provides estimates only and is for informational purposes. Actual tax liability depends on many factors including deductions, credits, adjustments, and jurisdiction-specific rules not covered here. Results may not reflect your true tax obligation. Always consult a qualified tax professional or your local tax authority for accurate tax planning and filing.