Free Tax Calculator - Estimate Your Tax Liability
Estimate your income tax bracket and liability.
Formula & Methodology
The Tax Calculator applies each portion of your income to the tax bracket it falls into, multiplies by that bracket's rate, and sums the results for your total tax. The effective rate is that total tax divided by your taxable income, which is usually lower than your top marginal bracket.
- Tax = Σ (Income in Bracket × Bracket Rate)
- Effective Rate = Total Tax / Taxable Income
Worked Example
Using the Tax Calculator: apply the formula above to your input values. For instance, Tax = Σ (Income in Bracket × Bracket Rate), then Effective Rate = Total Tax / Taxable Income. The tool performs each step instantly and shows the result.
Frequently Asked Questions
How is income tax calculated?
Taxable income is run through progressive brackets, so different portions of your income are taxed at increasing rates.
What is the difference between marginal and effective tax rate?
The marginal rate applies to your last dollar earned, while the effective rate is your total tax divided by total income.
How do deductions reduce my tax?
Deductions lower your taxable income, which can drop you into lower brackets and reduce the total tax owed.