Marriage Tax Penalty Calculator
Compare a joint return against what two single filers would pay.
Shows whether marriage costs you or saves you, and where the penalty actually starts.
Changing your currency elsewhere on the site will not affect this page.
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 ($32,200 for 2026).
- Single Tax 1 and 2: each person’s tax calculated independently using the Single filing brackets and the single standard deduction ($16,100 for 2026).
Here is the part most articles on this get wrong.
For 2026 the joint brackets are exactly double the single ones all the way up through the 32% band, and the joint standard deduction is exactly double as well. Two people earning $90,000 and $85,000 pay $20,840 as two singles and $20,840 as a married couple. Not approximately. The same figure, to the cent.
The bracket table only breaks the doubling at the top. Single filers hit 37% at $640,600 of taxable income, so two of them would not reach it until $1,281,200 combined. A married couple hits it at $768,700. That one row is the entire federal marriage penalty in the income tax, and it does not touch anyone below roughly $800,900 of combined income.
When you get a bonus instead: One spouse earning much more than the other, or one earning nothing at all. The low earner’s unused low brackets absorb the high earner’s income. A couple at $200,000 and $0 saves several thousand dollars a year by being married, and that case is far more common than the penalty.
Worked example, an actual penalty: Two people each earning $500,000.
- As two singles: $138,134 each, $276,269 combined
- Married filing jointly on $1,000,000: $280,251
- Penalty: $3,982 a year
Where the penalty really bites, and none of it is in the bracket table:
| Provision | Single | Married filing jointly |
|---|---|---|
| Net Investment Income Tax starts | $200,000 | $250,000, not $400,000 |
| Additional Medicare 0.9% starts | $200,000 | $250,000, not $400,000 |
| State and local tax deduction cap | one cap each | one cap between them |
| Earned Income Credit phase-out | own limit | a shared limit |
Two single people with $180,000 each pay no Net Investment Income Tax at all. Marry them and $110,000 of their combined income sits above the joint threshold. That is a far bigger swing than the bracket arithmetic, and this calculator does not include it, so treat the figure it gives as the floor of the penalty rather than the whole of it.
State income tax compounds it again. Plenty of states run joint brackets that are not double the single ones, and a few require you to use the same filing status you used federally.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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