Single vs Married Filing: How It Affects Your Taxes
Quick Answer
Married filing jointly typically results in lower taxes than filing as single, thanks to a larger standard deduction ($30,000 vs $15,000) and wider tax bracket thresholds. The benefit is greatest when one spouse earns significantly more than the other. However, when both spouses earn similar incomes, the combined amount can sometimes push into higher brackets, creating what is known as the marriage penalty.
Key Differences
| Feature | Single | Married Filing Jointly |
|---|---|---|
| Standard deduction (2025) | $15,000 | $30,000 |
| 10% bracket ends at | $11,925 | $23,850 |
| 12% bracket ends at | $48,475 | $96,950 |
| 22% bracket ends at | $103,350 | $206,700 |
| 24% bracket ends at | $197,300 | $394,600 |
Notice that the joint brackets are exactly double the single amounts for the lower brackets. This means two people earning the same amount pay the same tax whether they are single or married filing jointly — in theory. The marriage penalty appears at higher brackets where joint thresholds are less than double the single amounts.
Real Example With Actual Numbers
Scenario 1: One High Earner
James earns $120,000 and his wife Emily earns $0. They live in Texas.
If James were single: Taxable income = $120,000 - $15,000 = $105,000. Federal tax = ~$17,654.
Filing jointly: Taxable income = $120,000 - $30,000 = $90,000. Federal tax = ~$10,856.
Savings from filing jointly: $6,798 — this is the marriage bonus in action.
Scenario 2: Two Equal Earners
Alex and Sam each earn $100,000 ($200,000 combined). They live in California.
If both were single: Each has taxable income of $85,000. Each pays ~$13,656. Total: $27,312.
Filing jointly: Taxable income = $200,000 - $30,000 = $170,000. Federal tax = ~$27,686.
Marriage penalty: $374 — they pay slightly more filing jointly because the higher brackets do not perfectly double.
Try the married calculator to see exactly how your specific incomes combine.
When Married Filing Jointly Wins
- One spouse earns much more than the other
- One spouse does not work (stay-at-home parent)
- Combined income stays in lower-to-middle brackets
- You want to maximize credits (Child Tax Credit, education credits)
When Filing Separately Might Help
In some situations, married filing separately can be better:
- One spouse has high medical expenses (the 7.5% AGI threshold is easier to clear with lower individual income)
- Student loan repayment on an income-driven plan
- One spouse has tax liabilities or garnishments you want to keep separate
- See the full guide on when to file separately
Beyond Federal Tax
Filing status also affects:
- State taxes: Some states have their own marriage penalty or bonus
- FICA: Not affected by filing status
- Credits and phaseouts: Many credits phase out at different income levels for single vs married filers
- Dependents: Only one return can claim each dependent
Compare your single and married take-home pay side by side with the SalaryHog calculator and the married calculator.