Marriage Tax Calculator
Adjust the inputs below. Results update as you type.
How it works
A marriage penalty occurs when combined tax as MFJ exceeds the sum of two single returns—common when both spouses earn similar incomes. A bonus occurs when one spouse earns much more—the lower earner's income is effectively taxed at a lower rate. The 2017 TCJA reduced penalties for most couples but they persist at higher income levels. AMT, EITC, and ACA subsidies also create marriage effects.
Input guidance
- Use realistic rates from lender or provider quotes instead of headline averages.
- Model conservative, baseline, and optimistic scenarios before deciding.
- Include recurring real-world costs (fees, taxes, insurance, maintenance) where relevant.
The formula
Compare tax filed jointly as a married couple against the sum of two single returns on the same incomes. A positive difference is a marriage penalty; a negative one is a marriage bonus.
Worked example
Two earners making $90,000 each may owe slightly more filing jointly than as two singles (a penalty), while a couple with one $150,000 earner and one with no income usually pays less jointly (a bonus).
More examples to test
- Conservative case: use a higher interest rate and lower growth assumptions to stress-test affordability.
- Optimistic case: use a lower rate with stable income assumptions to compare upside potential.
How to interpret results
Treat this as a planning model, not a final approval tool. Compare at least two scenarios and focus on total-cost and cash-flow trade-offs.
When this can be inaccurate
Results can diverge due to fees, changing rates, tax rules, lender policies, and behavior changes that simplified models cannot fully capture.
Change history
- July 2026: Quality-reviewed for publication with formula checks and explanatory copy updates.
Site-wide corrections also appear on the corrections log.
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Frequently asked questions
What causes a marriage penalty?+
When two similar high incomes combine and push the couple into higher brackets faster than two separate single filers would reach them.
What is a marriage bonus?+
When incomes are unequal, joint filing can pull the higher earner's income into lower brackets, reducing total tax versus filing single.
Does everyone see a change?+
No. Many couples see little difference; the size and direction depend on how similar the two incomes are and on deductions.
How should I use this result?+
Treat it as a planning estimate. Compare at least two realistic scenarios, then confirm with statements, quotes, or a qualified professional before acting.
How often should I refresh assumptions?+
Refresh whenever rates, income, costs, or policy limits change materially, and before making irreversible commitments.