Smart Web Apps US Federal Income Tax Calculator
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US Federal Income Tax Calculator

Estimate federal income tax using progressive brackets, filing status, and standard/itemized deductions. This page supports tax-year tables via JSON (so you can keep data current as IRS values update).

Loading tax tables…
Tax tables (advanced)
Data last updated: Not set Source: Not set
Pasted tables are stored in your browser (localStorage) and override the file-based tables.
Example: interest, freelance, taxable unemployment (varies), etc.
Example: student loan interest deduction (limits apply).
Applied after tax is computed. Not all credits are non-refundable.
Results
Estimated federal income tax
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Effective rate (tax Ă· total income)
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Intermediate values
Bracket breakdown
Rate Taxable slice Tax
Formulas

Tool description

This calculator estimates US federal income tax using progressive brackets. It does not include payroll taxes (FICA), state/local taxes, AMT, NIIT, capital gains schedules, phase-outs, or complex credits.

How to use

  1. Configure tax tables (tax year + IRS bracket/deduction data).
  2. Select filing status.
  3. Enter income, adjustments, and deductions.
  4. Calculate to view total tax and bracket breakdown.

Why it’s useful

  • Model “what-if” income scenarios.
  • See how deductions change taxable income and bracket slices.
  • Compare standard vs itemized deductions quickly.

Use cases & interpretation

  • Budgeting: estimate how much of your income may go to federal income tax.
  • Negotiation: model the impact of a raise on marginal vs effective rates.
  • Planning: estimate tax impact of deductions or pre-tax contributions (if applicable).

FAQs

IRS values (standard deductions and bracket thresholds) can change each tax year. This tool uses JSON tables so you can keep the data current.

Not necessarily. This is a simplified estimator focused on progressive brackets and deductions. Real returns can include additional schedules and rules.
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Disclaimer

This calculator provides estimates only and is not tax advice. For tax advice, consult a qualified professional.