"Second of all, deductions are the way that the rich make sure that they pay a lot less taxes than the upper middle class. There is a reason that Barbra Streisand thinks that income taxes should be raised; she isn't going to pay much more tax. Most of her money is in assets, earning more money. It's the guy who owns the gas station down the street who's going to get it in the teeth. If we want to tax the rich, let's tax them, not give umpteen zillion deductions so they have the same marginal rate as your average bike messenger."
Courtesy of Megan McArdle.