Income Tax Calculator
Estimate your federal income tax liability based on 2024-2025 US tax brackets and standard deductions.
Input Parameters
Results
US Federal Income Tax (2024-2025)
The US uses a progressive tax system — you only pay a higher rate on income within each bracket, not your entire income. Your marginal rate is the rate on your last dollar of income; effective rate is your total tax divided by total income.
What is the Income Tax Calculator?
The Income Tax Calculator estimates your total federal tax liability based on the IRS progressive tax brackets. It helps you anticipate your tax bill before April or check if you are withholding enough money from your paychecks.
How It Works (Algorithm)
The US tax system is "progressive," meaning your entire salary is not taxed at one flat rate. Instead, chunks of your income are taxed at increasingly higher rates. The calculator fills up each "bracket" chronologically until your total income is accounted for, then subtracts the Standard Deduction.
$$ \text{Effective Tax Rate} = \frac{\text{Total Tax Owed}}{\text{Gross Income}} \times 100 $$
Calculates your true, blended tax percentage.
How to Use It
Enter your annual gross income. Select your filing status (Single, Married, Head of Household). The tool will run your income through the federal brackets and output your total estimated tax bill and your Effective Tax Rate.