Compare estimated 2025 or 2026 US federal income tax for two individual filers with a married-filing-jointly estimate.
Calculator
Uses the standard deduction and ordinary income only. Other taxes, credits, and deductions are excluded.
Result Summary
Review the main answer, supporting values, chart breakdown, and calculation details.
Result Breakdown
Calculation Details
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How this marriage tax calculator works
Enter each spouse's ordinary income and choose the tax year. The estimate calculates regular federal income tax for each person filing as Single, adds those amounts, then compares that total with a married-filing-jointly estimate on combined income. A positive difference means the joint estimate is higher; a negative difference means it is lower.
2025 and 2026 federal tax brackets
The calculation applies progressive marginal rates to estimated taxable income after the IRS standard deduction: $15,750 per Single filer and $31,500 jointly for 2025; $16,100 per Single filer and $32,200 jointly for 2026. Higher marginal rates apply only to income within each bracket, not to all income.
Bracket and deduction amounts are based on the IRS 2026 tax-year adjustments and IRS Revenue Procedure 2025-32, including the updated 2025 standard deduction and tax tables.
What the estimate excludes
This is a simplified comparison of regular federal income tax on ordinary income, not a tax return or tax advice. It uses the standard deduction and does not model tax credits, itemized deductions, qualified dividends or capital gains, AMT, additional Medicare tax, self-employment tax, state or local taxes, dependents, or filing-status exceptions such as Head of Household. Your actual filing outcome can differ. Review the take-home pay calculator for a separate paycheck estimate and consult IRS instructions or a qualified tax professional for a full estimate.
Why marriage can change a tax bill
Federal brackets and deductions for joint filers are not always exactly twice the single amounts at every income level. When spouses have similar incomes, some income may cross a bracket threshold after combining; when incomes differ substantially, joint brackets can sometimes reduce the combined regular tax. Credits, deductions, and other tax provisions can change that comparison.
Frequently asked questions
Does this determine whether we should file jointly?
No. It compares a limited federal income-tax estimate. Filing decisions can affect credits, deductions, liability, and state taxes beyond this model.
Which year should I choose?
Select the year the income was earned, not the year you submit the return. For example, 2026 income is generally reported on a return filed in 2027.