How much is the federal income tax for domestic partner's medical benefit?

Is there any extra income tax for someone with a domestic partner than just one single person? If so, what's the percentage and how is it calculated?

Anonymous2008-05-03T10:58:55Z

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The extra tax is your marginal tax bracket.

Let's say you had taxable income at $30K. The extra insurance value is $5000. For a single person, some would be at 15%, the rest at 25% because of the tax tables. (It's like getting a bonus at the end of the year.)