Marriage Tax Calculator
Compare combined federal tax filing jointly as a married couple vs. each partner filing single, to reveal a marriage bonus or penalty.
- Combined Tax as Two Singles$18,706.00
- Tax Filing Jointly$18,706.00
Filing jointly saves $0.00 compared to filing single separately — a marriage bonus, common when one partner earns notably more than the other.
- Combined Tax if Both Filed Single$18,706.00
- Marriage Bonus$0.00
2024 federal brackets only — ignores deductions, credits and state tax.
About the Marriage Tax Calculator
It's a genuinely common assumption that married filing jointly simply doubles the single-filer brackets, so two incomes combined would owe exactly what they'd owe filing separately as singles. That's mostly, but not exactly, true — some joint brackets are less than double their single equivalents, which is exactly the gap that creates a marriage penalty or bonus depending on how the two incomes compare.
This calculator runs both scenarios — each partner's income taxed separately at single rates, versus the combined income taxed once at married rates — side by side, so couples can see which way it actually cuts for their specific numbers rather than relying on a rule of thumb.
Both partners' incomes stay on your device for this comparison — nothing about either income is sent anywhere or stored.
Frequently asked questions
What causes a marriage penalty?
It typically shows up when both partners earn similar, substantial incomes — combining them under joint brackets can push the combined total into higher brackets sooner than either partner would have hit filing separately as a single.
What causes a marriage bonus instead?
It's most common when one partner earns significantly more than the other, or one partner has little or no income — the lower earner's income effectively gets taxed at a lower bracket by being combined with the higher earner's, under wider joint brackets, than it would if filed alone.
Is it ever possible to file separately after marrying to avoid a penalty?
Married filing separately is a real filing status, but it usually results in a higher combined tax bill than filing jointly, not a lower one — it exists mainly for cases where separating liability matters more than minimizing tax, like some legal or student-loan-repayment situations.
Does this account for deductions and credits that change with filing status?
No — this compares the raw progressive bracket math only, on taxable income as entered. Several credits and deduction limits actually do shift with filing status in ways not modeled here, so a real return can diverge further from this estimate than the brackets alone suggest.
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