Does saying "I do" cost you or save you?
Enter what each spouse earns and see the 2024 federal picture: your tax as two single filers, your tax filing jointly, and whether marriage hands you a bonus or a penalty.
The two incomes
Uses 2024 federal brackets and the standard deduction ($14,600 single, $29,200 married filing jointly). Federal income tax only, no state tax, credits or itemized deductions.
What this means for you
Two singles vs filing jointly
Total federal tax, each way
Marriage scorecard
Bonus or penalty across income splits
Same combined household income, split different ways between the two spouses. A lopsided split leans toward a bonus, two equal high earners lean toward a penalty.
| Spouse 1 | Spouse 2 | Tax as singles | Tax filing jointly | Bonus / penalty |
|---|
Marriage and taxes, explained
What Is the Marriage Tax Penalty?
A marriage tax penalty occurs when a married couple filing jointly pays more in federal income tax than they would have paid as two single filers. This happens most often when both spouses earn similar incomes, pushing their combined earnings into higher tax brackets than they would face individually. The penalty is most pronounced at higher income levels, where the 35% and 37% brackets for married filers are not exactly double the single filer thresholds.
When Marriage Creates a Tax Bonus
A marriage tax bonus occurs when a couple pays less in taxes by filing jointly than they would as two single individuals. This typically happens when there is a significant income disparity between spouses, because the higher earner benefits from the wider married-filing-jointly brackets. The largest bonus occurs when one spouse has little or no income, effectively allowing the earning spouse to use the full joint bracket width and nearly doubling their standard deduction.
How Tax Brackets Change When You Marry
When you marry and file jointly, most federal tax bracket thresholds are exactly double the single filer amounts, which was designed to eliminate the marriage penalty at lower income levels. However, the 35% bracket begins at $243,725 for singles but $487,450 for joint filers (exactly double), while the 37% bracket starts at $609,350 for singles versus $731,200 for joint filers (not double). This gap at the top brackets is what creates the marriage penalty for two high earners.
Filing Jointly vs Filing Separately
Married filing jointly is almost always the more tax-efficient option, offering wider brackets, a larger standard deduction, and access to more credits and deductions. Filing separately results in a higher combined tax bill in most cases and disqualifies you from many benefits like the Earned Income Tax Credit and education credits. However, filing separately may be beneficial when one spouse has significant medical expenses, is on an income-driven student loan repayment plan, or when spouses want to keep their tax liabilities separate.
Common questions
What is the marriage tax penalty?
A marriage tax penalty occurs when a married couple pays more in taxes filing jointly than they would as two single filers. This typically happens when both spouses earn similar incomes, pushing more of their combined income into higher tax brackets.
When does marriage create a tax bonus?
A marriage tax bonus occurs when one spouse earns significantly more than the other. The higher earner benefits from the wider married brackets, effectively lowering their tax rate. The biggest bonus happens when one spouse has little or no income.
Should we file jointly or separately?
Filing jointly almost always results in a lower combined tax bill due to wider brackets and more deductions. Filing separately is rarely beneficial but may help in cases involving income-driven student loan repayments or when one spouse has large medical expenses.
How do tax brackets differ for married vs single filers?
Most married filing jointly brackets are exactly double the single brackets, eliminating the marriage penalty at lower incomes. However, the 35% and 37% brackets are not perfectly doubled, which can create a penalty for high-earning couples.
Estimate for planning only. Federal income tax based on 2024 brackets and the standard deduction, ignoring state tax, payroll tax, credits, itemized deductions and other adjustments. Your real tax depends on your full return. Verify with a tax professional before deciding.