For informational purposes only. Not financial, investment, or tax advice. Results are estimates based on the inputs provided. Consult a qualified financial professional before making financial decisions.
Calculator tool
How this calculator works
Use the explanation to understand the formula, assumptions, and practical limits behind the calculator result.
What This Calculator Compares
This calculator compares two tax scenarios from the same pair of incomes:
- Each income taxed as if filed by a separate single filer
- Both incomes combined on one married-filing-jointly return
The difference reveals a simplified marriage tax bonus or marriage tax penalty.
2026 Standard Deductions Used
| Filing model | Standard deduction used |
|---|---|
| Single | 16,100 |
| Married filing jointly | 32,200 |
The calculator then applies the 2026 progressive federal brackets built into the live tool.
How the Comparison Works
For each spouse, the calculator first subtracts the single standard deduction and computes tax under the single brackets. It then combines both incomes, subtracts the married-joint standard deduction, and computes tax under the married-joint brackets.
- A negative difference is a bonus
- A positive difference is a penalty
- Zero means no difference in this simplified model
Worked Example
If one spouse earns 60,000 and the other earns 40,000, the calculator compares:
| Scenario | Estimated federal tax |
|---|---|
| Two singles | 7,640 |
| Married filing jointly | 7,640 |
Under this simplified 2026 comparison, the result is no difference.
Important Limits
This tool is a comparison model, not a filing recommendation. It does not include:
- Tax credits
- Itemized deductions
- Dependents
- Payroll taxes
- Capital gains, business income, or special deductions
- State or local tax
- Married-filing-separately rules
Actual married taxpayers generally cannot choose to file as two single taxpayers. The two-single scenario exists only to measure the bonus-or-penalty effect.
Frequently asked questions
What causes a marriage tax bonus?
A bonus often appears when the two spouses have very different incomes. Combining them can let more of the higher earner's income fit into lower joint brackets than under the two-single comparison.
What causes a marriage tax penalty?
A penalty can appear when two incomes are both high enough that the joint brackets are not simply twice as wide as the single brackets at every level. The calculator shows that effect directly from the 2026 brackets it uses.
Does this calculator tell me how I should file?
No. It compares a hypothetical two-single model with married filing jointly so you can understand the marriage effect. It does not compare all real filing options, credits, or deductions.
Why might my tax software show a different result?
Tax software can include credits, itemized deductions, dependents, other income types, phaseouts, and state rules. This calculator intentionally keeps only ordinary income, the standard deduction, and federal brackets so the marriage effect is easier to isolate.
