Marriage Tax Penalty Calculator
Compare taxes when filing jointly vs separately.
See if marriage creates a tax bonus or penalty — high earners with similar incomes often pay more married.
The marriage tax penalty (or bonus) refers to the difference in total income tax owed when two people file jointly as a married couple versus what they would have paid filing individually as two single taxpayers.
Formula: Marriage Difference = Joint Tax Liability − (Single Tax 1 + Single Tax 2)
- If the result is positive, you pay a marriage penalty (you owe more married than single).
- If the result is negative, you receive a marriage bonus (you owe less married than single).
What each variable means:
- Joint Tax Liability — the tax calculated on the couple’s combined income using Married Filing Jointly (MFJ) brackets and the MFJ standard deduction ($29,200 for 2024).
- Single Tax 1 and 2 — each person’s tax calculated independently using the Single filing brackets and the single standard deduction ($14,600 for 2024).
When penalties typically occur:
- Both spouses earn similar incomes — they get “pushed” into higher brackets faster when combined.
- High earners — the 32%, 35%, and 37% bracket thresholds are less than double the single thresholds.
When bonuses typically occur:
- One spouse earns much more than the other — the lower-earning spouse pulls the combined income into lower brackets.
- One spouse earns little or nothing — the couple benefits from the MFJ brackets without much income penalty.
Worked example: Person A earns $90,000 and pays ~$14,900 in federal tax (single). Person B earns $85,000 and pays ~$13,600 (single). Combined single tax = $28,500. As a married couple, their $175,000 joint income falls into higher brackets, resulting in ~$29,800 in tax — a marriage penalty of $1,300.
State income taxes often compound the penalty further, as many states do not fully adjust brackets for joint filers.