Finance & Investment
Income Tax Calculator
Calculate income tax based on current tax brackets
How Is U.S. Federal Income Tax Calculated?
The U.S. uses a progressive tax system — you don't pay one flat rate on all your income. Instead, your taxable income is split across brackets, and each portion is taxed at its own rate (10% to 37%). Only the income within each bracket is taxed at that bracket's rate.
The calculation flow: Gross Income → subtract pre-tax deductions (401k, health insurance) → Adjusted Gross Income (AGI) → subtract standard or itemized deduction → Taxable Income → apply bracket rates → subtract credits → Tax Owed. FICA taxes (Social Security 6.2% + Medicare 1.45%) are calculated separately on gross income.
How to Use This Calculator
- Enter your gross annual income and select your filing status
- Choose standard or itemized deduction (enter amount if itemized)
- Add your state tax rate and number of dependents
- Optionally enter pre-tax deductions like 401(k), health insurance, and HSA/FSA
- Click "Calculate Taxes" to see your federal tax, FICA, state tax, effective rate, and take-home pay
Common Use Cases
- Paycheck planning: Estimate your monthly and bi-weekly take-home pay after all taxes
- 401(k) impact: See how increasing pre-tax contributions reduces your tax bill
- Filing status comparison: Compare tax outcomes for Single vs Head of Household or Joint filing
- State tax comparison: Compare your tax burden across states with different tax rates
- Deduction decision: Determine whether standard or itemized deduction saves you more
- Salary negotiation: Understand the after-tax value of a raise or new job offer
2024 Federal Income Tax Brackets
| Rate | Single | Married Filing Jointly | Head of Household |
|---|---|---|---|
| 10% | $0 – $11,600 | $0 – $23,200 | $0 – $16,550 |
| 12% | $11,601 – $47,150 | $23,201 – $94,300 | $16,551 – $63,100 |
| 22% | $47,151 – $100,525 | $94,301 – $201,050 | $63,101 – $100,500 |
| 24% | $100,526 – $191,950 | $201,051 – $383,900 | $100,501 – $191,950 |
| 32% | $191,951 – $243,725 | $383,901 – $487,450 | $191,951 – $243,700 |
| 35% | $243,726 – $609,350 | $487,451 – $731,200 | $243,701 – $609,350 |
| 37% | Over $609,350 | Over $731,200 | Over $609,350 |
Standard Deductions & Payroll Taxes (2024)
Standard Deductions
| Single | $14,600 |
| Married Filing Jointly | $29,200 |
| Married Filing Separately | $14,600 |
| Head of Household | $21,900 |
| Additional (65+ or blind) | +$1,550 / +$1,950 single |
FICA Payroll Taxes
| Social Security | 6.2% on first $168,600 |
| Medicare | 1.45% on all earnings |
| Additional Medicare | 0.9% over $200,000 |
| Total FICA (employee) | 7.65% typical |
| Child Tax Credit | $2,000 per qualifying child |
Marginal vs. Effective Tax Rate
| Taxable Income (Single) | Federal Tax | Marginal Rate | Effective Rate |
|---|---|---|---|
| $25,000 | $2,768 | 12% | 11.1% |
| $50,000 | $5,894 | 22% | 11.8% |
| $75,000 | $11,394 | 22% | 15.2% |
| $100,000 | $16,894 | 24% | 16.9% |
| $150,000 | $28,894 | 24% | 19.3% |
| $250,000 | $52,206 | 35% | 20.9% |
Marginal rate = the rate on your last dollar earned. Effective rate = total tax ÷ total income. Your effective rate is always lower than your marginal rate because of progressive brackets.
FAQ – Income Tax Calculator
What is a progressive tax system?
In a progressive system, higher income is taxed at higher rates — but only the income within each bracket is taxed at that bracket's rate. For example, a single filer earning $50,000 in 2024 pays 10% on the first $11,600, 12% on $11,601–$47,150, and 22% on the remaining $2,850. This means moving into a higher bracket doesn't increase the tax on your lower income.
What is the difference between marginal and effective tax rate?
Your marginal tax rate is the rate applied to your last dollar of income — it's your tax bracket. Your effective tax rate is the total tax you pay divided by your total income. Because of progressive brackets, your effective rate is always lower. Someone in the 22% bracket might have an effective rate of only 12–15%.
Should I take the standard deduction or itemize?
Take whichever is larger. For 2024, the standard deduction is $14,600 (single) or $29,200 (married jointly). Itemizing makes sense if your mortgage interest, state/local taxes (SALT, capped at $10,000), charitable donations, and medical expenses exceed the standard deduction. About 87% of taxpayers use the standard deduction.
What are FICA taxes?
FICA (Federal Insurance Contributions Act) includes Social Security tax (6.2% on the first $168,600 of earnings in 2024) and Medicare tax (1.45% on all earnings, plus an additional 0.9% on earnings over $200,000). Your employer pays a matching amount. Self-employed individuals pay both halves (15.3% total).
How do pre-tax deductions reduce my taxes?
Pre-tax deductions like 401(k) contributions, health insurance premiums, and FSA/HSA contributions are subtracted from your gross income before taxes are calculated. A $10,000 401(k) contribution for someone in the 22% bracket saves $2,200 in federal taxes plus applicable state taxes. The money grows tax-deferred until withdrawal.
What is the child tax credit?
The child tax credit is $2,000 per qualifying child under 17. It directly reduces your tax bill (not just taxable income). Up to $1,700 per child is refundable, meaning you can receive it even if you owe no tax. The credit phases out for single filers earning over $200,000 and joint filers over $400,000.
Which states have no income tax?
Nine states have no state income tax: Alaska, Florida, Nevada, New Hampshire (dividends/interest only), South Dakota, Tennessee, Texas, Washington, and Wyoming. Enter 0% for state tax rate if you live in one of these states. State tax rates in other states range from about 1% to 13.3% (California's top rate).
How accurate is this calculator?
This calculator provides a solid estimate using 2024 federal brackets, standard deductions, FICA rates, and child tax credits. It doesn't account for all possible credits (earned income credit, education credits), alternative minimum tax (AMT), investment income (capital gains), or state-specific deductions. For exact figures, consult a tax professional or use IRS tax software.
What filing status should I choose?
Single: unmarried with no dependents. Married Filing Jointly: married couples combining income (usually the best option). Married Filing Separately: married but filing individual returns (useful in specific situations like income-based loan repayment). Head of Household: unmarried with a qualifying dependent — gives wider brackets and a larger standard deduction than Single.
How can I reduce my tax bill legally?
Maximize pre-tax contributions (401k up to $23,000 in 2024, HSA up to $4,150 single/$8,300 family). Contribute to a traditional IRA ($7,000 limit). Claim all eligible credits. Harvest investment losses to offset gains. If self-employed, deduct business expenses. Charitable donations reduce taxable income if you itemize. Timing income and deductions across tax years can also help.