Marriage Tax Calculator (Penalty vs Bonus)
2026Calculate whether marriage will increase or decrease your combined tax bill. Compare filing single vs married jointly.
By Konstantin Iakovlev · Updated September 2026 · Source: IRS Rev. Proc. 2025-32 — 2026 tax rate tables and standard deductions
Marriage Bonus
$150.00
Best Filing Strategy
Married Filing Jointly
Lowest Tax
$13,140.00
Filing Comparison
| Combined Gross Income | $140,000.00 |
| Both Filing Single | |
| Your Tax | $7,670.00 |
| Spouse's Tax | $5,620.00 |
| Total | $13,290.00 |
| Married Filing Jointly | $13,140.00 |
| Married Filing Separately | |
| Your Tax | $7,670.00 |
| Spouse's Tax | $5,620.00 |
| Total | $13,290.00 |
Marriage Penalty vs. Bonus
A marriage penalty occurs when a couple pays more in taxes filing jointly than they would as two single filers. A marriage bonus occurs when they pay less. Couples with similar high incomes are more likely to face a penalty, while couples with one high earner and one low/no earner often receive a bonus.
Use the Marriage Tax Calculator (Penalty vs Bonus) above to calculate your results. Enter your values and see instant results — all calculations run in your browser.
Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.
How It Works
Tying the knot can move your federal tax bill in either direction. Some couples owe more together than they would as two single filers, a so-called marriage penalty, while others owe less and enjoy a marriage bonus. Knowing which way it cuts matters when you are weighing marriage or deciding between filing jointly and separately.
To find the difference, the tool first adds up what each partner would owe filing as Single, then computes the bill for the same two incomes under Married Filing Jointly, and it shows Married Filing Separately as a third column. It uses the 2026 federal brackets and standard deductions ($16,100 single or separate, $32,200 joint) or the itemized amounts you enter; credits are not included. Every 2026 joint bracket threshold up to the start of the 35% rate is exactly double the single one, so the brackets alone produce a penalty only once combined taxable income passes $768,700, where the joint 37% rate begins (a single filer reaches 37% above $640,600).
How large that penalty or bonus turns out to be hinges on the size of each income and how far apart the two earners are. Couples with similar high incomes tend to face penalties, while a single-earner household often sees a bonus. Filing jointly can also shift which deductions and credits you qualify for, and those changes can swing the result more than the brackets alone.
Example: $150,000 Combined Income, Split Two Ways
- 1 Input: your income $80,000, spouse's income $70,000, both on the standard deduction. The calculator uses the 2026 brackets.
- 2 Both filing Single: $80,000 − $16,100 = $63,900 taxable, so $5,800 on the first $50,400 (10% and 12% slices) + 22% × $13,500 = $8,770. $70,000 − $16,100 = $53,900 taxable, so $5,800 + 22% × $3,500 = $6,570. Total: $15,340.
- 3 Married Filing Jointly: $150,000 − $32,200 = $117,800 taxable, so $11,600 on the first $100,800 + 22% × $17,000 = $15,340. Filing separately also comes to $8,770 + $6,570 = $15,340. The calculator shows a marriage penalty of $0, because at these incomes the joint brackets are exactly double the single ones.
- 4 Same $150,000, one earner: enter $150,000 and $0. As a single filer the earner would owe $17,966 + 24% × ($133,900 − $105,700) = $24,734, while the joint return is still $15,340, so the calculator shows a marriage bonus of $9,394.
Source: IRS Rev. Proc. 2025-32 — 2026 tax rate tables and standard deductions · Last updated: September 2026
Frequently Asked Questions
What is the marriage tax penalty?
Who gets a marriage tax bonus?
Can married couples file separately to avoid the penalty?
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