Marriage Tax: $100,000 and $100,000 Incomes
Comparing federal tax filing jointly vs. filing separately as two singles. Use the calculator below to try your own numbers.
Marriage Bonus
$0
Example
Filing jointly with incomes of $100,000 and $100,000, your combined federal tax is $27,228, versus $27,228 if each spouse filed Single separately — a marriage bonus of $0.
Combined Tax (Filing Separately)
$27,228
Tax Filing Jointly
$27,228
Filing separately vs. jointly
What Is the Marriage Tax Penalty (or Bonus)?
The marriage penalty (or bonus) is the difference in total federal tax a couple pays filing jointly compared to what they would owe if each filed as Single individually. Because tax brackets and standard deductions for Married Filing Jointly aren't always exactly double the Single amounts, combining two incomes can push a couple into a situation where they owe more — or sometimes less — tax than if they weren't married.
A penalty tends to occur when both spouses earn similar, moderate-to-high incomes, since combined income pushes into higher brackets faster than two separate incomes would. A bonus tends to occur when incomes are very unequal, since the higher earner effectively "shelters" some income in the lower spouse's unused bracket space.
How Is This Calculated?
This calculator computes federal tax three ways: each spouse's tax as if filing Single (using Single brackets and the Single standard deduction), then tax on the combined income using Married Filing Jointly brackets and deduction. The difference between the joint tax and the sum of the two Single taxes is the penalty (if positive) or bonus (if negative).
Why Similar Incomes Tend to Trigger a Penalty
When both spouses earn comparable incomes, filing jointly stacks both incomes into the same set of brackets. Because the Married Filing Jointly brackets are less than double the Single brackets in the higher tax tiers, a two-high-earner couple can end up with more combined income taxed at a higher marginal rate than either would face filing alone.
Why Unequal Incomes Tend to Trigger a Bonus
When one spouse earns significantly more than the other, filing jointly lets the couple use the lower earner's unused lower-bracket space, effectively taxing some of the higher earner's income at a lower rate than they'd pay filing Single. This is the mechanism behind most marriage bonuses.
This Is an Estimate, Not a Filing Recommendation
Actual tax liability depends on credits, itemized deductions, state taxes, and other factors not modeled here. Married couples generally cannot choose to file as two Singles regardless of the result — the comparison is illustrative, not a legal filing option, except for the separate "Married Filing Separately" status, which typically produces a worse result than joint filing.
Example — Your Current Inputs
Filing jointly with incomes of $100,000 and $100,000, your combined federal tax is $27,228, versus $27,228 if each spouse filed Single separately — a marriage bonus of $0.
Additional Example — Equal $100,000 Incomes
Two spouses each earning $100,000 (combined $200,000) face a modest marriage penalty of a few hundred dollars under 2025 brackets, since their combined income crosses into a higher bracket sooner jointly than it would filing as two separate $100,000 Single filers.
About These Parameters
- Spouse 1 & Spouse 2 Annual Income
- Enter each spouse's gross annual income before deductions. The calculator applies the standard deduction automatically — it does not currently support itemized deductions or additional income adjustments.
Frequently Asked Questions
Does everyone who gets married pay a penalty?
No — most couples with unequal incomes actually receive a marriage bonus. The penalty mainly affects couples where both spouses earn similar, moderate-to-high incomes.
Can I just file as Single to avoid the penalty?
No — married couples must file as either Married Filing Jointly or Married Filing Separately, not Single. Married Filing Separately is usually a worse outcome than filing jointly, so it rarely eliminates a penalty.
Does this include state income tax?
No — this calculator estimates federal tax only. State tax treatment of marriage varies significantly and isn't included in this estimate.