What Is the Marriage Bonus?
Quick Answer
The marriage bonus is the tax savings a couple gets by filing jointly instead of as two single filers. It occurs most often when one spouse earns significantly more than the other. The higher earner benefits from the lower earner's unused tax bracket space and the doubled standard deduction, resulting in a lower combined tax bill than if both filed separately as single.
How the Marriage Bonus Works
When you file as married filing jointly, your combined income is spread across bracket thresholds that are double the single amounts (for most brackets). If one spouse earns much more than the other, the high earner's income that would have been in the 22% or 24% bracket as a single filer drops into the 12% bracket on the joint return because the other spouse's bracket space is unused.
Additionally, the joint standard deduction is $30,000 vs $15,000 for a single filer. A couple where only one person works gets $30,000 in deductions on the earner's income — double what they would get filing as single.
Real Example With Actual Numbers
Andrew earns $140,000 and his wife Beth is a stay-at-home parent. They live in Texas.
If Andrew Filed as Single
- Taxable income: $140,000 - $15,000 = $125,000
- Federal tax: $1,192.50 + $4,386 + $12,072.50 + $5,196 = $22,847
Filing Jointly
- Taxable income: $140,000 - $30,000 = $110,000
- Federal tax: $2,385 + $8,772 + $2,871 = $14,028
Marriage bonus: $8,819 per year
Andrew saves nearly $9,000 in federal taxes by being married and filing jointly. The extra $15,000 standard deduction and Beth's unused bracket space make a huge difference. Try the married calculator to see your bonus.
When the Marriage Bonus Is Largest
The bonus grows with greater income disparity between spouses:
| Earner 1 | Earner 2 | Combined Tax (Joint) | Tax as Two Singles | Marriage Bonus |
|---|---|---|---|---|
| $100,000 | $0 | $8,370 | $14,260 | $5,890 |
| $150,000 | $0 | $14,028 | $24,458 | $10,430 |
| $200,000 | $0 | $29,566 | $38,878 | $9,312 |
| $100,000 | $50,000 | $14,996 | $17,622 | $2,626 |
| $100,000 | $100,000 | $21,400 | $21,400 | $0 |
When both spouses earn the same amount, the bonus disappears entirely. When incomes are very different, the bonus can exceed $10,000.
The Marriage Bonus Beyond Federal Tax
State Taxes
In states with progressive taxes, the marriage bonus can add additional savings. California and New York have their own bracket structures for joint filers. States with no income tax like Texas and Florida have no state-level bonus to gain.
Credits and Deductions
Filing jointly also opens up credits that increase the effective bonus:
- Roth IRA contribution phaseout is higher for joint filers
- Earned Income Tax Credit is available (not available for MFS)
- Education credits have higher AGI phaseouts
- Child Tax Credit applies more favorably
Getting Married? Here Is What to Do
If you are planning to get married and expect a marriage bonus:
- Update your W-4 after the wedding to adjust withholding
- Coordinate retirement contributions — Both spouses should maximize 401(k) contributions
- Plan for the first joint return — If you marry in December, you are considered married for the entire year
- Review state tax impact — Check how your state handles joint filing
Read more about how getting married affects your taxes or model your scenario with the married calculator.