By James Kwak
In honor of the deficit commission, Ezra Klein is running a number of posts about the commission’s proposals and our tax code, including one about the mortgage interest tax deduction. Although this is often defended as a middle-class tax break, on a percentage-of-income basis it mainly benefits people between the 80th and 99th income percentiles; above that they make so much money that they can’t buy big enough houses to keep up. (On a dollar basis, of course, the correlation between income and tax savings is perfect.)
This should not be surprising, since like any itemized deduction (a) it’s worthless if you have a small house and take the standard deduction instead, (b) it’s proportional to the size of your mortgage, and (c) it’s proportional to your tax bracket. Klein says, “I’m not really clear why we’re giving people making hundreds of thousands a year large subsidies to buy a house, but I’m sure there’s a good reason.” I’m sure he knows the reason, but I’ll spell it out anyway.