Inputs
Results
How this federal income tax calculator works
This calculator estimates federal income tax for the 2025 tax year. It starts with gross income, subtracts above-the-line or pre-tax deductions you enter, subtracts the standard deduction for your filing status unless you override it, and then applies the 2025 federal income tax brackets to estimated taxable income.
Gross income
Enter annual income before federal income tax. This can be wages, self-employed income after business accounting, or another planning estimate you want to test.
Deductions
The calculator subtracts optional deductions plus the standard deduction. Use the override field only if you want to test a different deduction amount.
Bracket math
Tax is calculated progressively, so each layer of taxable income is taxed at its own bracket rate. Your top bracket is not applied to every dollar.
Standard deduction and taxable income
Taxable income is not the same thing as gross income. For this simplified estimate, taxable income is gross income minus deductions entered on the page and the standard deduction used for your filing status.
The calculator uses 2025 standard deduction amounts from the shared tax table built into TheDailyo. If your real tax return uses itemized deductions, additional adjustments, or special deductions, your final taxable income may be different.
Marginal vs effective tax rate
The marginal tax rate is the rate on your last layer of taxable income. The effective federal income tax rate shown here is estimated federal income tax divided by gross income. These numbers answer different questions.
For example, being in the 22% bracket does not mean all income is taxed at 22%. Some taxable income may be taxed at 10%, some at 12%, and only the income inside the 22% bracket is taxed at 22%.
Example: estimating federal tax from income
Suppose a single filer has $80,000 of gross income and $3,000 of pre-tax deductions. The calculator subtracts the deductions and the standard deduction to estimate taxable income, then applies the 2025 tax brackets. The result shows estimated federal income tax, taxable income, marginal bracket, and effective rate.
This is useful for planning, but it is not a full tax return. Credits, dependents, business deductions, retirement contributions, capital gains, and other items can materially change the final number.
What this estimate does not include
This calculator focuses on regular federal income tax. It does not include payroll taxes, self-employment tax, state income tax, local tax, tax credits, alternative minimum tax, net investment income tax, capital gains rates, child tax credit, education credits, or every special rule that can apply to a real return.
If you want to estimate paycheck-level take-home pay, use the take-home pay calculator. If you are self-employed, pair this with the self-employment tax calculator and quarterly estimated tax calculator.
Sources and review
This page uses TheDailyo's 2025 federal bracket and standard deduction tables for a simplified educational estimate. Always confirm important tax decisions with official IRS guidance or a qualified tax professional.
- IRS federal income tax rates and brackets
- IRS standard deduction information
- TheDailyo educational-use disclaimer
Last reviewed: May 4, 2026.
FAQ
Is federal income tax based on gross income or taxable income?
Federal income tax brackets apply to taxable income, not gross income. Taxable income generally starts with income and then subtracts deductions and adjustments that apply to your situation.
Why is my marginal rate higher than my effective rate?
Federal tax brackets are progressive. Your marginal rate applies to the last portion of taxable income, while your effective rate averages the estimated tax across gross income.
Does this calculator include tax credits?
No. Credits can reduce tax directly, but this calculator keeps the estimate focused on income, deductions, taxable income, brackets, marginal rate, and effective rate.
Can I use this for state taxes?
No. State income tax systems use their own rules, deductions, rates, and credits. This page estimates federal income tax only.