Federal Income Tax Calculator 2026

What is a federal income tax calculator?

A federal income tax calculator estimates the federal income tax you may owe based on your income, filing status, deductions and credits. This income tax calculator uses the 2026 rules and figures listed on this page. It can help you plan before filing or decide whether to review your withholding.

The estimate starts with adjusted gross income. It subtracts eligible deductions to find taxable income, then applies the tax brackets for your filing status. Long-term capital gains and qualified dividends use separate rates that depend on how they stack with ordinary income. Eligible child and dependent credits can reduce the tax estimate.

Why your federal tax estimate matters

Your estimated tax can inform decisions about paycheck withholding, a bonus, retirement contributions and the timing of income or gains. If the estimate differs from what you expected, check the inputs before changing your budget or making a financial decision.

Your marginal rate applies to your last dollar of income. Your effective rate compares total estimated tax with income. The rates answer different questions: the marginal rate can help you understand the tax effect of additional ordinary income, while the effective rate gives you a broader view of the estimate.

This federal tax calculator estimates federal income tax, not your complete tax picture. It does not replace a filed return, and the estimate may not account for every tax or personal circumstance. For tax planning or a filing decision, confirm the result with a qualified tax professional.

How to use this federal income tax calculator

1. Choose your filing status. The calculator uses it to select the applicable standard deduction and tax brackets.
2. Enter wages and salary, then add other ordinary income. Use amounts that match your estimate for the tax year.
3. Enter long-term gains and qualified dividends separately from ordinary income. The calculator applies their rates separately from ordinary income.
4. Add pre-tax 401(k), HSA and similar contributions. Enter the amount that reduces your income for this estimate.
5. Enter itemized deductions if you plan to use them. Enter zero to use the standard deduction; the calculation subtracts the larger of the two.
6. Add the number of people on the return age 65 or older, children under 17 and other dependents. Include qualified overtime premium and qualified tips if applicable. Eligibility and limits can affect whether these amounts qualify for deductions or credits, so confirm them before relying on the estimate.

Federal income tax calculator example

How to read your tax calculator results

Adjusted gross income is wages and other income plus gains, minus pre-tax contributions, as calculated here. Taxable income is what remains after the applicable deduction amounts are subtracted. It is not the same as your gross wages.

Tax before credits is the estimated tax before child and dependent credits are applied. Federal income tax is the estimate after credits used. The child tax credit is $2,200 per qualifying child, and the credit for other dependents is $500; the child credit phases out above $200,000, or $400,000 for joint filers. Up to $1,700 per child may be refundable. Actual eligibility and the amount you can claim depend on your circumstances.

Ways to manage your federal tax estimate

1. 01

   Review paycheck withholding

   Compare the estimate with federal tax withheld so far and your expected withholding for the year. If they do not seem aligned, consider reviewing your withholding elections with payroll or asking a tax professional what change fits your situation.

2. 02

   Check pre-tax contributions

   If you can afford to save more, consider whether increasing a 401(k) or HSA contribution fits your goals and plan rules. Re-enter the contribution amount to see how it changes the estimate. A lower tax estimate is not the only consideration; contributions also affect money available in your paycheck.

3. 03

   Confirm deductions and credits

   Check whether itemizing or using the standard deduction gives the larger amount. Confirm that any senior, overtime, tip or dependent-related entry meets the applicable requirements before you count it in your plan.

4. 04

   Plan around income and gains

   If you expect a bonus, additional income or a sale with long-term gains, enter it separately and review how the estimate changes. Consider discussing timing with a qualified tax professional before acting.

Common federal tax calculator mistakes

• Treating taxable income as total income

  Taxable income reflects deductions. Check adjusted gross income and taxable income separately when comparing the result with pay or income records.

• Entering overtime pay instead of the premium

  The input asks for qualified overtime premium, not all overtime wages. Use the amount that meets the applicable rules, and confirm eligibility with a tax professional.

• Using the wrong deduction amount

  Entering itemized deductions replaces the standard deduction only when itemizing produces the larger deduction. Check the amount and filing status before relying on taxable income.

• Assuming the estimate is a refund or final bill

  Estimated federal income tax and tax withheld are different figures. Withholding is a payment toward tax; the estimate is not a filed return or a guarantee of what you will owe or receive.

The federal income tax formula

Key terms

Adjusted gross income

Income after the pre-tax contributions included in this calculator are subtracted.

Taxable income

Income remaining after applicable standard or itemized deductions and other included deductions are subtracted.

Marginal tax rate

The rate applied to your last dollar of income.

Effective tax rate

Total estimated tax divided by income, expressed as a percentage.

Qualified dividends and long-term gains

Income entered separately from ordinary income and calculated using the applicable long-term capital gains rates.