Tax Calculator — Step-by-Step Solutions
The Tax Calculator estimates your US federal income tax using current tax brackets. It supports five modes: federal income tax calculation, effective tax rate, tax bracket finder, marginal versus effective rate comparison, and sales tax calculation.
Enter your taxable income and filing status to see your estimated tax liability, effective rate, and a bracket-by-bracket breakdown showing exactly how much tax you owe at each rate.
This is a simplified estimate for educational purposes. Consult a tax professional for actual tax advice.
Your calculations will appear here
How to Use the Tax Calculator
- Select a mode: Federal Income Tax, Effective Tax Rate, Tax Bracket Finder, Marginal vs Effective comparison, or Sales Tax.
- Enter your gross annual income and filing status for income tax modes. For sales tax, enter the price and tax rate.
- Review the bracket-by-bracket breakdown table to see how much tax is owed at each rate level.
- Compare your marginal rate against your effective rate to understand progressive taxation.
Formula and Theory
The US federal income tax system uses progressive brackets. The 2025 brackets for single filers are: 10% up to $11,600, 12% up to $47,150, 22% up to $100,525, 24% up to $191,950, 32% up to $243,725, 35% up to $609,350, and 37% above.
The standard deduction reduces taxable income. For 2025: $14,600 (single), $29,200 (married filing jointly), $21,900 (head of household).
Your marginal rate is the rate on your last dollar of income. Your effective rate is total tax divided by total income. The effective rate is always lower due to progressive brackets.
Sales tax is a consumption tax at point of sale. Rates vary by state (0% to 7.25%) and locality.
Worked Examples
Example 1: Federal tax on $85,000 (single)
Problem: Estimate federal income tax for $85,000.
Solution: Taxable = $70,400. Apply progressive brackets.
Answer: $10,541 (effective rate approximately 12.4%)
Example 2: Finding your tax bracket
Problem: What bracket for $55,000 single?
Solution: Taxable = $40,400. Falls in 12% bracket.
Answer: 12% marginal tax bracket
Example 3: Marginal vs effective comparison
Problem: Compare rates for $120,000 single.
Solution: Taxable = $105,400. Marginal is 24%.
Answer: Marginal: 24%, Effective: approximately 14.8%
Example 4: Sales tax calculation
Problem: $49.99 item with 8.25% sales tax.
Solution: Tax = $4.12.
Answer: $54.11 total
Frequently Asked Questions
Does this include state income taxes?
Marginal vs effective tax rate?
What is the standard deduction?
How accurate is this?
What is sales tax?
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