Two-person comparison
2026 Marriage Penalty or Bonus Calculator
Filing jointly is not always cheaper than filing as two single people. When both partners earn similar, high incomes, the joint bracket thresholds can be less than twice the single thresholds at the top of the schedule, producing a marriage penalty. When incomes are unequal, joint filing often produces a bonus.
Enter both incomes. The tool computes the tax each person would owe as a single filer with a single standard deduction, adds them, then compares that with the tax on their combined income under the joint schedule and joint standard deduction.
Calculator
Official 2026 figures used here
| Partner A | Partner B | Two singles | Joint | Difference |
|---|---|---|---|---|
| $120,000 | $120,000 | $35,140 | $35,140 | $0 (no difference) |
| $150,000 | $40,000 | $27,354 | $24,140 | -$3,214 bonus |
| $40,000 | $0 | $2,620 | $780 | -$1,840 bonus |
| $500,000 | $500,000 | $276,269 | $280,251 | +$3,982 penalty |
How to read the result
The joint standard deduction is exactly twice the single amount, and the first five joint bracket thresholds are exactly twice the single ones. The asymmetry appears higher up: the 35% threshold is $768,700 jointly versus $640,600 singly, which is less than double, and the 37% threshold behaves the same way.
That top-end compression is why two high earners with similar incomes can pay more jointly. Conversely, when one partner earns little or nothing, joint filing lets the higher earner use the unused lower brackets of the joint schedule, which is where most marriage bonuses come from.
This comparison is deliberately simplified. Real returns involve credits that phase out differently by status, itemized deductions, and in some cases married filing separately. Treat the result as a structural illustration, not a filing recommendation.
Two practical notes before acting on the result. Withholding is set separately on each spouse's Form W-4, while a joint return combines the liability, so a bonus or penalty on paper often shows up as an unexpected refund or balance due rather than as a different total tax. Second, credits are where the largest discrepancies hide: several phase out at joint thresholds that are not exactly double the single ones, and some are unavailable to married filing separately. A couple with children, education expenses or retirement contributions should treat this bracket-only comparison as a starting point and then check the credit rules for their situation.
Questions people ask about this figure
Why does the tool only compare single and joint?
The IRS published 2026 rate thresholds for those two statuses in the guidance used here. Extrapolating thresholds for married filing separately would introduce unsupported numbers.
Is married filing separately ever better?
It can be in specific situations involving income-driven repayment, large itemized deductions or liability concerns. It generally has the least favorable thresholds and is not modeled here.
Do credits affect the comparison?
Yes, materially. Several credits have joint phaseout thresholds that are not double the single ones, so the real-world penalty can differ from this bracket-only result.
Related calculators
Every figure on this page appears in the official release listed below. The values were checked against those pages on 2026-11-14. Where a release states a threshold but does not publish a rate, this site reports the threshold and does not estimate the missing value.
- IRS: Tax inflation adjustments for tax year 2026 — Revenue Procedure 2025-32 / IR-2025-103