I like how 90% (no pun intended) of right wing maniacs don't understand the basic concept of MARGINAL tax rates. If the top marginal tax rate is 90% for income over $1,000,000, the second bracket is 40% for $500,000-1,000,000 and the bottom rate is 20% for $0-500,000, a person making $1,000,000 in pre-tax income will take home (500,000-(20%)(500,000)) + (500,000 - (40%)(500,000)) = $700,000.
the MARGINAL tax rate is only effective on portions of income OVER the amount at which they kick in. Hope this helps.