He has stated ad nauseam that he feels he is undertaxed. If he truly feels this way, he should pay the amount of tax he feels appropriate. Extremely powerful and wealthy people should not be praised for stating the extremely obvious, and all the while taking every advantage they can of the tax code. Yes, I know he has shareholders to be accountable. Yes, I know he is one of the most outspoken members of the Gates' pledge. It has become en vogue for the ultra wealthy to talk about how they should be taxed more. Easy to say for them, especially when high income earners (like doctors) who aren't even in the same stratosphere and get lumped in with people like them.