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Formula & explanation
Marriage Tax Calculator uses the following calculation:
This is a simplified model intended for planning and education. Real-world offers from lenders, institutions, or tax authorities may include additional fees, rules, or adjustments not reflected here.
Frequently asked questions
What causes a marriage penalty?
It typically arises when both spouses have similar, moderate-to-high incomes, pushing combined income into higher brackets faster than as two single filers.
What causes a marriage bonus?
When incomes are very uneven, joint filing often lowers combined tax because the lower earner's income fills up lower brackets.
Does this reflect all tax provisions?
No — this is a simplified federal income tax comparison and doesn't include credits, deductions beyond the standard deduction, or state tax effects.