What does the 2026 federal income tax calculator include?
It uses the IRS 2026 ordinary-income tax brackets and 2026 basic standard deductions for Single, Married Filing Jointly, Married Filing Separately, and Head of Household.
What is taxable income?
This page first subtracts entered adjustments from income, then subtracts either the 2026 standard deduction or the itemized deduction amount you enter. The remaining amount is used with the progressive federal brackets.
What do marginal and effective tax rates mean?
The marginal rate is the bracket rate applied to the next dollar of ordinary taxable income. The effective rate shown here is estimated regular federal income tax divided by the gross income entered.
What is not included automatically?
Capital-gain rates, AMT, NIIT, refundable credits, special deductions, phaseouts, dependency rules, self-employment tax, penalties and many other tax-return items require more information than this calculator collects.
Frequently asked questions
Sources and methodology
The calculator uses the current federal figures or official agency guidance described below where those rules apply. State-specific results should always be checked with the relevant state tax authority.