Jerz
The top 1% of NYC residents already pay 50% of its income taxes, so you keep raising taxes on that population and they're going to start heading for the exit.
That should be amended to say, the top 1% of residents who pay their taxes in full. The richest 10% in the U.S. are also the most likely to use offshore accounts and quasi-legal tax shelters as ways to avoid paying taxes. Quite a number of millionaires get away with paying paltry sums in taxes each year.
But more importantly, you should remember that even for someone in a lower tax bracket - say, me - paying a smaller percentage of their total income each year is still a lot of money, relatively speaking. When you make $40k/year, paying $10k of that into taxes is a big bite into your lifestyle. If I make $250k a year, paying $100k of that back in taxes (which is an exaggeration, but still) ain't really hurting that bad.
This isn't an argument to soak the rich. But the wealthiest Americans pay far less in income tax today than at any other point in history, so... I don't feel too bad for 'em.