Income Tax Calculator

Estimate U.S. federal income tax, taxable income, marginal rate, effective rate, and after-tax income.

How to Use

  1. Select the tax year and filing status.
  2. Enter annual gross income and any pre-tax deductions.
  3. Choose standard deduction or enter an itemized deduction amount.
  4. Add eligible tax credits if you want a closer estimate.
  5. Review the live breakdown and open Show Work for bracket-by-bracket math.

This tool estimates federal income tax only. It does not replace tax advice or a full filed return.

Tax Snapshot
Live Estimate
Fast client-side estimate for planning and budgeting.
Marginal
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Effective
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Estimated Federal Income Tax
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Enter your details to generate an estimate.
Gross Income
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Taxable Income
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Deductions Used
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Tax Credits
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Tax Before Credits
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After-Tax Income
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Ready for input.
Inputs & Settings
Enter annual values. Results update in the browser.
Federal estimate using the selected year’s bracket set.
Used to determine standard deduction and bracket thresholds.
Income before deductions and credits.
Examples: certain payroll or retirement reductions used for planning.
Choose standard or provide your own itemized deduction estimate.
Only used when Itemized Deduction is selected.
Credits reduce tax after bracket calculation.
Optional manual add-on for planning scenarios not covered by base federal income tax.
Estimated Tax
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Taxable Income
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Marginal Rate
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Effective Rate
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Use this estimate for planning. State, local, payroll, and special-case taxes may not be included.
Show Work (step-by-step)
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Work will show adjusted income, deduction used, taxable income, tax-by-bracket, credits, and final estimated federal income tax.

Estimator Logic

Quick answer: This tool estimates tax by subtracting deductions from income, applying the selected year’s federal tax brackets, then subtracting credits.

  • Adjusted income: Gross income − pre-tax deductions
  • Taxable income: Adjusted income − selected deduction
  • Tax before credits: Sum of tax due across each bracket
  • Estimated federal income tax: Tax before credits − credits + manual additional taxes
  • Effective tax rate: Estimated tax ÷ gross income
Negative taxable income is treated as zero. Credits cannot reduce the displayed federal income tax below zero before optional manual additional taxes are added.

FAQ

Does this include state income tax?

No. This page is for estimated U.S. federal income tax only unless you manually add other taxes for planning.

What is the difference between marginal and effective rate?

Marginal rate is the top bracket reached by your taxable income. Effective rate is your estimated total tax divided by gross income.

Should I use standard or itemized deduction?

Use the larger deduction if you are comparing planning scenarios. This tool lets you test both quickly.

Why might my filed return differ?

Real returns can include payroll taxes, phaseouts, special credits, capital gains treatment, self-employment tax, additional schedules, and state rules that are outside a simple estimator.

Tool Info

Last updated:

Updates may include UI improvements, bracket-year support, validation, and clearer planning assumptions.