I think you all underestimate basic human ambition. Communism-esque ideas like this always ignore that a lot of people (maybe even half or even a majority; I wouldn't be surprised at either) want to make it big, so to speak. Especially in America. Most of them won't, but they like having that unattainable goal. I think there would be some pretty widespread dissapointment/disillusionment/"What's the point of doing anything anymore" feelings among the populace.
So, here's a slightly different solution. Let any income over the $100,000(I'm assuming this is ending, after insurance/business expenses/required taxes stuff, otherwise this idea is even worse) be used by the earner in any non-personal way they see fit. They can donate to charity, build a park, fund the invention of a time machine, whatever, as long as it can benefit others. You avoid the problem of a crappy government getting ludicrous tax income, and the people losing the money don't feel like they're losing it. Seeing the money float off into a pool of government taxes is disheartening; seeing it become a public park with your name on it would be fulfilling.