US Income Tax Calculator
Estimate your federal income tax (single filer, simplified).
✓ Get an accurate estimate of your federal income tax liability in seconds. Our calculator uses 2025 tax brackets and deductions to show you exactly what you'll owe.
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Understanding Your Tax Calculation
Your federal income tax is calculated using a progressive tax system with seven tax brackets. This means different portions of your income are taxed at different rates, not your entire income at one rate.
Key Tax Terms
Gross Income: Your total income before any deductions, including wages, salaries, bonuses, and other earnings.
Deductions: The 2025 standard deduction for single filers is $14,600. You can choose this or itemize deductions if they exceed the standard amount.
Taxable Income: Calculated as Gross Income minus Deductions. This is the amount subject to federal tax.
Effective Tax Rate: Your actual tax rate as a percentage of gross income, accounting for the progressive bracket system.
Marginal Tax Rate: The tax rate on your last dollar of income. Important for understanding how additional income or deductions affect your taxes.
Tax Planning Tips
- Maximize Deductions: Compare standard deduction ($14,600) to itemized deductions. If itemized exceed standard, use those.
- Retirement Contributions: Contributions to 401(k)s and traditional IRAs reduce taxable income, lowering your federal tax.
- Child Tax Credits: Dependent children can save you $2,000 per child in taxes.
- State Taxes: This calculator only estimates federal taxes. Remember to account for state and local taxes as well.
Frequently Asked Questions
Get answers to common questions about this calculator
Q: What's the difference between marginal and effective tax rates?▼
A: Your marginal tax rate is the rate on your last dollar of income. Your effective tax rate is your total tax divided by total income. For example, if you owe $15,000 on $100,000 income, your effective rate is 15%, but your marginal rate might be 22%.
Q: Should I use the standard deduction or itemize?▼
A: Use whichever is higher. For 2025, the standard deduction for single filers is $14,600. Itemize if your deductible expenses (mortgage interest, charitable donations, property taxes, etc.) exceed this amount. Most people benefit from the standard deduction.
Q: How do dependent credits affect my taxes?▼
A: Each dependent (child) provides a $2,000 child tax credit, which directly reduces your tax bill. This is different from a deduction—it's a dollar-for-dollar reduction in taxes owed, which is more valuable.
Q: This calculator seems low/high. Why?▼
A: This is a simplified calculation for single filers using 2025 brackets. It doesn't account for alternative minimum tax (AMT), earned income tax credit (EITC), investment income, self-employment tax, or state/local taxes. Consult a tax professional for a complete picture.