Income Tax Calculator
Estimate your income tax based on tax brackets.
Tax Brackets
Disclaimer
This is a simplified estimate. Actual taxes may vary based on deductions, credits, filing status, and other factors. Consult a tax professional for accurate calculations.
About this tool
A simplified income tax calculator for the United States, South Korea, and Japan based on 2024 federal/national income brackets. It applies progressive marginal rates to your taxable income to estimate the total tax, effective rate, and after-tax amount. Many real-world deductions, credits, and state/local taxes are not modeled. For educational purposes only — not legal or tax advice.
How to use
- Choose the country: United States, South Korea, or Japan.
- Enter your annual taxable income in the local currency.
- View your estimated tax, effective rate, and after-tax income.
- Scroll down to see the bracket-by-bracket marginal rates used.
- Compare different income levels to see how brackets stack.
Common use cases
- Comparing how the same income is taxed across countries.
- Estimating self-employment quarterly tax payments.
- Understanding the difference between marginal and effective rates.
- Sanity-checking the tax line on a contract or offer letter.
- Educational discussions about progressive taxation.
Frequently asked questions
Q. Are state, local, or filing-status differences included?
A. No. The calculator uses single-filer federal/national brackets only. State, prefectural, and local taxes are not modeled.
Q. Why is my actual tax different?
A. Real returns include deductions, credits, payroll-withheld amounts, and special situations (capital gains, AMT, etc.) that this tool does not handle.
Q. What is the difference between marginal and effective rates?
A. Marginal is the rate on your next dollar; effective is total tax divided by total income — usually lower than the top marginal rate.
Q. Is this legal or tax advice?
A. No. Always consult a licensed tax professional (CPA / 세무사 / 税理士) for binding decisions.