Marriage Tax Calculator

Two incomes — see whether joint filing helps or hurts versus filing as two singles.

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No difference
$0.00
Tax as two singles
$17,540.00
Tax filing jointly
$17,540.00

Couples with very unequal incomes tend to see a bonus, since the lower earner's income fills up the lower joint brackets. Two high, similar incomes can trigger a penalty, since the top joint brackets aren't simply double the single ones.

A worked example

Two spouses each earning $80,000 pay exactly the same federal tax filing jointly as they would as two singles — no bonus, no penalty. But a couple earning $150,000 and $30,000 sees a bonus of about $4,214, since the lower earner's income fills brackets that would otherwise go unused.

Frequently asked questions

Why do equal incomes usually show no difference?

Most federal tax brackets for married-filing-jointly are set at exactly double the single brackets specifically to keep equal-earning couples tax-neutral — the marriage bonus or penalty mostly shows up when incomes are unequal or very high.

Why would a couple with very different incomes get a bonus?

When one spouse earns much more than the other, filing jointly lets the lower earner's income occupy the lowest tax brackets that would otherwise go unused — pulling the couple's overall average rate down compared to filing as two singles.

Why would two high, similar earners see a penalty?

At high income levels, the top one or two married-filing-jointly brackets are not simply double the single brackets — they compress sooner, pushing a larger share of combined income into the top rate earlier than two equivalent single filers would experience.

This calculator provides estimates for general informational purposes only and is not tax advice. Uses 2026 federal brackets and standard deductions only — doesn't account for credits, itemized deductions, or state taxes.