Income Tax Calculator

Estimate your US federal income tax

Income & Filing
Tax Summary
Estimated Tax: $0
After-Tax Income: $0
Taxable Income: $0
Effective Rate: 0%

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What is Income Tax?

Federal income tax is a progressive tax levied by the US government on individual and business income. The tax system uses marginal tax brackets, meaning different portions of your income are taxed at different rates. As your income increases, only the amount above each bracket threshold is taxed at the higher rate, not your entire income.

This calculator uses the current US federal tax brackets to estimate your tax liability based on filing status, income, deductions, and credits. It shows both your effective tax rate (total tax divided by income) and marginal rate (rate on your highest dollars). Understanding your tax burden helps with financial planning, withholding adjustments, and tax-efficient investment decisions.

How to Use This Calculator

Step 1: Select your filing status - this determines your tax brackets and standard deduction.
Step 2: Enter your annual gross income from all sources (wages, business, investments).
Step 3: Input deductions - standard deduction or itemized deductions (mortgage, state tax, charity).
Step 4: Enter tax credits - dollar-for-dollar reductions (child tax credit, education credits).
Step 5: Click "Calculate Tax" to see your estimated federal tax liability.
Step 6: Review effective vs marginal rates and adjust withholding if needed.

Examples

Example 1 - Single Filer: Income: $75,000, Deductions: $5,000, Credits: $0. Taxable: $70,000. Estimated tax: ~$11,000. Effective rate: ~15%. After-tax income: ~$64,000.

Example 2 - Married Joint: Income: $150,000, Deductions: $10,000, Credits: $2,000. Taxable: $140,000. Estimated tax: ~$22,000. Effective rate: ~15%. After-tax: ~$128,000.

Example 3 - Head of Household: Income: $60,000, Deductions: $8,000, Credits: $1,500. Taxable: $52,000. Estimated tax: ~$7,000. Effective rate: ~12%. After-tax: ~$53,000.

Who Should Use This Calculator?

  • Employees – Check if withholding is adequate to avoid owing at tax time.
  • Self-Employed – Estimate quarterly tax payments to avoid penalties.
  • Side Gig Workers – Understand tax impact of additional income.
  • Financial Planners – Optimize retirement contributions and deductions.
  • Taxpayers – Plan for tax refunds or amounts due before filing.

Pro Tips

  • Maximize pre-tax deductions: 401(k), HSA, and traditional IRA reduce taxable income.
  • Tax credits are more valuable than deductions - prioritize credit-eligible activities.
  • Bunch deductions in alternating years if near standard deduction threshold.
  • Time income and deductions between years to stay in lower brackets when possible.
  • Use IRS Tax Withholding Estimator to fine-tune W-4 allowances.
  • Safe harbor: Pay 100% of prior year tax (110% if AGI >$150k) to avoid underpayment penalties.
  • Consider Roth vs Traditional contributions based on current vs expected future tax rates.

Frequently Asked Questions

What are the current federal income tax brackets?
2024 Federal Tax Brackets (Single): 10% on $0-$11,600; 12% on $11,601-$47,150; 22% on $47,151-$100,525; 24% on $100,526-$191,950; 32% on $191,951-$243,725; 35% on $243,726-$609,350; 37% over $609,350. Married Filing Jointly brackets are approximately double. Tax is calculated progressively - you pay each rate only on income in that bracket.
What is the difference between marginal and effective tax rate?
Marginal rate is the tax rate on your next dollar of income - the highest bracket you reach. Effective rate is your total tax divided by total income - your average tax burden. Example: $50,000 income with $6,000 tax has 12% effective rate, but marginal rate might be 22%. Marginal rate helps planning decisions; effective rate shows overall burden.
What deductions can I take?
Above-the-line deductions reduce AGI: 401(k), traditional IRA, HSA, student loan interest. Itemized deductions include: medical expenses (over 7.5% of AGI), state/local taxes (SALT cap $10k), mortgage interest, charitable donations. Standard deductions (2024): Single $14,600; Married $29,200; Head of Household $21,900. Most taxpayers take the standard deduction.
What tax credits are available?
Popular credits: Child Tax Credit ($2,000 per child), Earned Income Credit (low-moderate income workers), Child and Dependent Care Credit, Education Credits (American Opportunity, Lifetime Learning), Saver's Credit (retirement contributions), Energy Credits (EVs, solar). Credits reduce tax dollar-for-dollar, making them more valuable than deductions.
Should I take standard or itemized deduction?
Itemize if your total deductions exceed the standard deduction. Common itemizers: Homeowners with large mortgage interest, high state tax payers (up to $10k limit), major medical expenses, significant charitable donors. 90%+ of taxpayers now use standard deduction due to increased standard deduction amounts from 2018 tax reform.
How do I know if I'm withholding enough?
You're safe from penalty if: You owe less than $1,000 when filing, you paid 90% of current year tax, you paid 100% of prior year tax (110% if AGI >$150k). Use IRS Tax Withholding Estimator to check. Adjust W-4 if: You owed money last year, had a major life change (marriage, child, new job), or have non-wage income.
How do capital gains affect my taxes?
Short-term capital gains (held <1 year) are taxed as ordinary income. Long-term gains (held >1 year) have preferential rates: 0% for low incomes, 15% for most taxpayers, 20% for high earners. High earners may also pay 3.8% Net Investment Income Tax. Capital gains count toward AGI and can push you into higher brackets or phase out deductions.