Federal Tax Calculator

How to use this tool

Enter taxable wage estimate and rate assumption. Compare scenarios by adjusting income or rate.

Worked example

Example: $85,000 wages at 24% marginal slice for planning → adjust for brackets and deductions separately.

When to use this

• Annual tax planning conversations.
• Side-income impact estimates.
• Explaining marginal vs effective rates.

Common mistakes

• Ignoring FICA separately.
• Using prior year brackets without checking updates.
• Omitting self-employment tax on 1099 income.

Related long-tail tasks

• federal withholding calculator
• tax bracket calculator
• 1040 estimate

How it works

Enter gross income, optional deductions, a primary tax rate, and an optional additional rate (for example state tax). Taxable income is gross income minus deductions, then each rate is applied to taxable income. Results show total tax, net income, effective rate, and monthly estimates. This is a simple estimate, not official tax advice.

Limitations

This calculator applies a simple percentage to taxable income. It is not tax advice and does not account for jurisdiction, tax year, filing status, brackets, credits, or local rules. Consult a qualified tax professional for personal guidance.

Privacy and file handling

Your data is processed in your browser and is not uploaded to our server.

Accuracy & methodology

This section documents how the calculator works, what it leaves out, and when results were last reviewed. Figures are educational estimates—not professional advice—and are not labeled "current" unless tied to automatically updated reference data.

Formula source or methodology

Taxable income = max(0, gross − deductions). Primary tax = taxable × primary rate%. Additional tax = taxable × additional rate%. Net = gross − total tax.

Jurisdiction

User-defined (no built-in country tables)

Unit system

Currency; percent rates

Rounding method

Currency amounts round to two decimal places (half up via Math.round × 100 / 100). Effective rate uses Percentages round to two decimal places unless shown as whole percents in the UI.

Assumptions

• Flat effective rates entered by the user—not progressive brackets
• Deductions are a single lump sum
• Annual income; monthly figures divide by 12

Known omissions

• Not tax, legal, investment, or lending advice. Confirm material decisions with qualified professionals.
• Federal income tax brackets, standard deduction, and credits for any tax year
• State and local income taxes
• Filing status (single, married, head of household, etc.)
• Payroll taxes (FICA, Medicare surtax) and self-employment tax
• Alternative Minimum Tax (AMT) and net investment income tax
• Capital gains preferential rates

Test cases (automated)

• $50,000 gross, $10,000 deductions, 20% rate → $8,000 tax and $42,000 net
• Deductions exceeding gross clamp taxable income to zero
• Combined rates over 100% are rejected

Version & last verified

Logic version 1.0. Content and formulas last verified 2026-07-06.

Frequently asked questions

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