The Marriage Tax Bonus: How Much More Couples Actually Keep
Filing jointly instead of single can save a one-earner household thousands of dollars a year — and the gap grows the more you earn. Here's the real math behind the marriage bonus, and when it can flip into a penalty instead.
What Is the "Marriage Bonus"?
When one spouse is the primary earner, married filing jointly almost always pays less federal tax than the same person would pay filing single — because the married standard deduction and bracket widths are roughly double the single ones, but the income isn't. This is often called the marriage bonus. It's the opposite of the "marriage penalty" people sometimes warn about, which mainly shows up when both spouses earn similar, high incomes.
| Income | Fed. tax (single) | Fed. tax (married) |
| $40,000 | $2,762 | $1,000 (−$1,762) |
| $60,000 | $5,162 | $3,123 (−$2,039) |
| $80,000 | $9,214 | $5,523 (−$3,691) |
| $100,000 | $13,614 | $7,923 (−$5,691) |
| $150,000 | $25,247 | $16,228 (−$9,019) |
| $250,000 | $52,263 | $38,494 (−$13,769) |
| $500,000 | $139,297 | $104,526 (−$34,771) |
This is one of the largest, most consistent "bonuses" in the tax code for single-earner households — and it gets bigger in dollar terms as income rises, since the standard deduction gap and bracket-width gap apply to a larger base.
When Does It Flip Into a Penalty?
The marriage penalty shows up when both spouses earn similar, substantial incomes. Because married brackets aren't always exactly 2× the single brackets at every level (especially at the very top), two high earners combining their income onto one joint return can occasionally land in a higher combined bracket than they would filing separately as two single people — though "married filing separately" is usually still worse than joint in practice for most couples.
- One income, or a big income gap between spouses: Marriage bonus, usually substantial.
- Two similar high incomes (e.g., both earning $200k+): Can produce a marriage penalty at the margin, though it's usually smaller than the bonus single-earner households see.
- Two similar moderate incomes: Roughly a wash — close to what each would pay filing single.