Marriage Tax Calculator - Tax Penalty
Calculate the marriage tax penalty or bonus for a couple filing jointly vs separately. See how combining incomes affects your federal tax bracket and
Formula
Compare single vs married filing jointly taxes
Compares total tax paid if both filed single vs filing married jointly. The difference shows whether marriage creates a tax penalty or bonus.
Worked Examples
Example 1: Marriage Penalty Example
Problem:Both spouses earn $100,000. Compare single vs married filing jointly.
Solution:Filing Single (each):\nEach pays ~$17,400\nTotal: $34,800\n\nFiling Married Jointly ($200,000):\nTax: ~$36,500\n\nMarriage Penalty: $1,700\n\nBoth high incomes push combined income deeper into the 24% and 32% brackets than if split between two single filers.
Result:$1,700 marriage penalty
Example 2: Marriage Bonus Example
Problem:One spouse earns $180,000, other earns $20,000.
Solution:Filing Single:\nSpouse 1 ($180K): ~$35,500\nSpouse 2 ($20K): ~$800\nTotal: $36,300\n\nFiling Married Jointly ($200,000):\nTax: ~$33,200\n\nMarriage Bonus: $3,100\n\nThe lower earner's income stays in the 10-12% brackets, pulling down the effective rate on combined income.
Result:$3,100 marriage bonus
Example 3: Single-Income Couple
Problem:One spouse earns $150,000, other is stay-at-home parent.
Solution:If Single:\nEarner: ~$28,500 tax\nStay-at-home: $0\nTotal: $28,500\n\nMarried Filing Jointly:\nTax: ~$22,500\n\nMarriage Bonus: $6,000\n\nSingle-income couples get the largest bonus because the entire income is spread across married brackets (which are wider at lower levels).
Result:$6,000 marriage bonus
Frequently Asked Questions
What is the marriage tax penalty?
When a married couple filing jointly pays more tax than they would filing as two singles. Occurs when both spouses have similar high incomes. The penalty exists because married brackets aren't exactly double single brackets at higher income levels.
What is the marriage tax bonus?
When a married couple pays less tax together than if single. Occurs with unequal incomes - the lower earner's income 'fills up' the lower brackets first, leaving more room before hitting higher brackets. One-income couples see the largest bonus.
Why does the penalty/bonus exist?
Tax brackets for married couples aren't exactly double the single brackets. At higher incomes, the married brackets are less than 2× single. Two $150K earners each would be in 24% bracket single, but combined $300K pushes into 32% married. This creates the penalty.
Who experiences the biggest marriage penalty?
Couples where both earn similar high incomes ($150K+ each). The penalty can be $5,000-15,000 annually. Two high-earning professionals often face significant marriage penalties due to how brackets combine.