I've generally been in favor of progressive taxation, following the established economic consensus that high taxes on the wealthy is socially optimal. (I would prefer this were focused more strongly on Pigouvian and land taxes rather than income and property taxes, but in the absence of that option I guess I'll take income taxes.)
Of course, I've been effectively unemployed for the first ~10 years of my adult life, so it's easy to talk big about taxing others. Now that I have a real job, I just looked up my new tax bracket and WTF THE GOVERNMENT IS GOING TO TAKE 35% OF MY MONEY‽
Market resolves in 5 years based on whether I become significantly more opposed to income taxes on people who make the same amount of money as I do. My stated reasons for this are irrelevant.
@CraigDemel Not very. I suppose I should clarify that I'm in favor of progressive taxation in general, but not so much in favor of what the current government chooses to do with it.
Even long before any hint of getting a real job, I was in favor of billionaires engaging in tax avoidance in order to have more money to donate to effective charity.