How to use US Income Tax Calculator
This US federal income tax calculator estimates your total tax liability based on your annual income, filing status and the applicable tax brackets for the year you select. View rules for 2023, 2024, 2025 and 2026 in the year selector — each year has different brackets and deductions due to inflation adjustments. The calculator shows your effective tax rate, marginal rate, tax breakdown by bracket and deductions for Social Security and Medicare contributions.
- Select your tax year (2023, 2024, 2025, or 2026) from the dropdown at the top.
- Enter your annual gross income (salary, wages, bonuses before deductions).
- Choose your filing status: single, married filing jointly, head of household, or married separately.
- (Optional) Select your state — currently for informational reference only.
- Click Calculate to see your federal income tax, effective rate, marginal rate and contributions.
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How US tax brackets work
The United States uses a progressive tax system with seven federal tax brackets in 2025. Each bracket applies only to income within that range, not your entire income. For example, a single filer with $50,000 income pays 10% on the first $11,600 ($1,160) and 12% on the next $38,400 ($4,608), totaling $5,768 in federal tax — an effective rate of 11.5%, not 12%. This is why earning more money does not suddenly put your entire income into a higher bracket.
| Income Range | Tax Rate | Example (on $50,000 income) |
|---|---|---|
| $0–$11,600 | 10% | $1,160 |
| $11,600–$47,150 | 12% | $4,266 |
| $47,150–$100,525 | 22% | $638 (on $850 of $50k in this range) |
| $100,525+ | 24%+ | Not applicable for $50k income |
Standard deduction versus itemized deduction
You subtract the standard deduction from gross income to arrive at taxable income. In 2025, the standard deduction is $15,000 for single filers and $30,000 for married filing jointly. Most taxpayers use the standard deduction because it is simple and usually larger than the sum of itemized deductions (mortgage interest, property taxes, charitable donations). If your itemized deductions exceed the standard deduction, you can itemize instead. This calculator uses the standard deduction; if you itemize, you would reduce taxable income by your actual itemized total.
Effective versus marginal tax rate
Your effective tax rate is total tax divided by total income — your true average rate across all dollars earned. Your marginal tax rate is the rate on your next dollar of income, set by the highest bracket you touch. On $50,000 income, the effective rate might be 8%, but if the next bracket threshold is $47,150 (the 22% bracket), your marginal rate is 12%. This matters for planning: earning an extra $1,000 is taxed at your marginal rate, not your effective rate, so it is worth understanding which bracket you are in.
Social Security and Medicare contributions
These are mandatory payroll taxes withheld from your paycheck if you are an employee. Social Security is 6.2% on earnings up to $168,600 (2025 limit), capped at about $10,453 annually. Medicare is 1.45% with no wage cap. If you earn over $200,000 (single) or $250,000 (married), an additional 0.9% Medicare surtax applies to income above those thresholds. Together, these total about 7.65% of gross income for most workers, up to the Social Security wage base.
Worked examples
Single, $50K income, 2025
Inputs: $50,000 gross income
Result: ~$5,300 federal tax · 10.6% effective rate · 12% marginal rate
Married, $100K income, 2025
Inputs: $100,000 jointly
Result: ~$9,100 federal tax · 9.1% effective rate · 12% marginal rate
Head of Household, $75K, 2025
Inputs: $75,000 income
Result: ~$7,600 federal tax · 10.1% effective rate · 12% marginal rate
Glossary
- Tax bracket
- A range of income subject to a specific tax rate in the progressive system.
- Effective tax rate
- Total tax owed divided by total income — your true average tax rate.
- Marginal tax rate
- The tax rate applied to your next dollar of income, set by the highest bracket you touch.
- Standard deduction
- A fixed amount you subtract from gross income before calculating tax ($15,000–$30,000 depending on filing status).
- Taxable income
- Gross income minus the standard deduction (or itemized deductions), which is what tax brackets apply to.
- Filing status
- Your category (single, married, head of household, etc.) which determines your tax brackets and standard deduction.
- Wage base
- The maximum amount of income subject to a tax, such as the $168,600 Social Security wage base in 2025.
- Tax year
- The 12-month period (usually January–December) over which income and tax are calculated and reported.
Related reading
Frequently Asked Questions
Why use US Income Tax Calculator?
- Compare tax liability across multiple years (2023–2026) to see how inflation adjustments affect you
- See your effective rate (actual tax ÷ income) and marginal rate (rate on your last dollar)
- Full breakdown by tax bracket shows exactly how much of your income is taxed at each rate
- Includes mandatory payroll deductions: Social Security, Medicare and Additional Medicare Tax
- Four filing statuses (single, married, head of household, married separately) with separate brackets
Common use cases
- Estimate your federal income tax liability before filing to avoid surprise balances
- Compare how your tax changes from year to year due to bracket adjustments
- Understand the difference between marginal rate (next dollar) and effective rate (average)
- Plan contributions to retirement accounts to reduce taxable income and move into a lower bracket
- Compare your situation across filing statuses to confirm you are using the best one
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