Gwen's marginal tax bracket is 25%. Gwen pays alimony of $24,000 per year. Gwen's after tax cost for the $24,000 payment is Tax Chapter 3 Gwen's marginal tax bracket is 25%. Gwen pays alimony of $24,000 per year. Gwen's after tax cost for the $24,000 payment is A) $-0-. B) $6,000. C) $18,000. D) $24,000. Answer: C Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+