What Is the Marriage Penalty?
Quick Answer
The marriage penalty occurs when a married couple filing jointly pays more in federal income tax than they would if they were two single filers. It happens most commonly when both spouses earn similar incomes, especially at higher levels. The penalty exists because certain tax bracket thresholds for joint filers are less than double the single thresholds, causing the combined income to be taxed at higher rates.
When the Marriage Penalty Occurs
The 2025 federal brackets for married filing jointly are exactly double the single brackets through the 32% bracket. But the 35% and 37% brackets are narrower:
| Bracket | Single Starts At | MFJ Starts At | Perfectly Doubled? |
|---|---|---|---|
| 35% | $250,526 | $501,051 | Yes |
| 37% | $626,351 | $751,601 | No ($1,252,702 would be double) |
The marriage penalty is most pronounced at the 37% bracket, where the joint threshold ($751,601) is significantly less than double the single threshold ($1,252,702). But penalties can also appear at lower incomes through the standard deduction interaction and credit phaseouts.
Real Example With Actual Numbers
Rachel and Carlos each earn $130,000 in New York. Both take the standard deduction and have no other deductions.
As Two Single Filers
Each: $130,000 - $15,000 = $115,000 taxable Each pays: ~$20,402 Combined: $40,804
As Married Filing Jointly
Combined: $260,000 - $30,000 = $230,000 taxable Joint tax: $41,540
Marriage penalty: $736 per year
The penalty is modest here because the bracket misalignment primarily affects the highest brackets. For two earners making $400,000 each, the penalty can exceed $10,000.
Run your own comparison at the married calculator.
Who Is Most Affected
The marriage penalty tends to hit:
- Two similar high earners: Two people each earning $200,000+ face the largest penalties
- Couples near credit phaseouts: The Additional Medicare Tax threshold is $200,000 for single but only $250,000 for joint (not $400,000), creating a hidden marriage penalty
- Couples with investment income: The Net Investment Income Tax has the same uneven thresholds
Who Gets a Marriage Bonus Instead
The marriage bonus occurs when one spouse earns significantly more than the other. The higher earner's income benefits from the lower earner's unused bracket space. A couple with a $200,000 / $0 income split can save $10,000+ by filing jointly vs the earner filing single.
The FICA Marriage Penalty
There is also a hidden marriage penalty in FICA. The Additional Medicare Tax kicks in at $200,000 for single filers but $250,000 for married couples — not the expected $400,000. A couple earning $180,000 each would pay no Additional Medicare Tax as two single people, but owe 0.9% on $110,000 ($360,000 - $250,000 = $110,000) when married.
Strategies to Minimize the Penalty
While you cannot eliminate the marriage penalty through filing status choice (MFS brackets offer no relief), you can reduce your combined taxable income:
- Both spouses max out their 401(k): $23,500 each = $47,000 reduction in taxable income. See how 401(k) reduces taxes
- Both contribute to an HSA: If eligible, HSA contributions reduce AGI
- Coordinate withholding: Make sure your combined W-4s account for the penalty so you do not underpay throughout the year
Check your marriage penalty or bonus with the married calculator and see state-by-state impacts at the SalaryHog calculator.