Marriage Tax Calculator

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.

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.

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.

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.