Estimate your federal income tax, taxable income, effective tax rate, marginal tax rate, and after-tax income. This free income tax calculator is a simple planning tool for common filing situations.
Enter your values and click Calculate to estimate your income taxes.
This income tax calculator estimates federal income tax by starting with annual gross income, subtracting pre-tax adjustments, then applying either a standard deduction or itemized deductions to reach taxable income.
It then applies progressive federal tax brackets to estimate federal tax, subtracts any entered tax credits, and optionally estimates state income tax using a flat percentage rate. The results show taxable income, total estimated tax, effective tax rate, and after-tax income.
This calculator uses a simplified tax-planning method:
Adjusted Gross Income = Gross Income - Pre-Tax Adjustments
Taxable Income = Adjusted Gross Income - Deduction
Federal income tax is then calculated progressively through tax brackets, meaning different portions of taxable income are taxed at different rates.
Effective tax rate is estimated with:
Effective Tax Rate = Total Tax ÷ Gross Income
Your marginal rate applies to the highest portion of your taxable income, while your effective rate reflects your total tax burden across all brackets.
Some taxpayers benefit more from the standard deduction, while others benefit from itemizing. Comparing both can be useful for planning.
Credits typically reduce your tax bill dollar for dollar, while deductions reduce taxable income before tax is calculated.
Real tax returns can include many additional rules, phaseouts, surtaxes, payroll taxes, and state-specific details not included here.
No. This calculator estimates income tax only. Social Security and Medicare payroll taxes are not included in this version.
No. This is a simplified planning tool. It does not include every tax credit, deduction limit, phaseout, or special rule.
Yes. This calculator lets you switch between a standard deduction and a custom itemized deduction amount.
No. The state tax estimate in this version uses a flat rate that you enter. Actual state tax systems may be more complex.