Does Marriage Cost You at Tax Time?

This marriage tax calculator answers one question: would the same two incomes owe less tax as singles or as a married couple filing jointly? It runs 2025 federal brackets and standard deductions under both statuses and reports the penalty or bonus.

Where the Penalty Comes From

Two singles each get their own $15,000 standard deduction and their own low brackets. A married couple shares one $30,000 deduction — often a wash — but the second income stacks on top of the first, and the marginal dollars can land in higher brackets than they would separately. Dual high earners feel this most.

Reading Your Result

A positive number is a penalty — you pay more married. A negative number is a bonus — the law favors your union. The percentage row scales it against your singles tax so you can judge materiality, and the marginal-rate row shows which bracket your combined income actually sits in.