It also tells us about the various deductions that people are using, for foreign taxes paid and so on.

FORBES: Paul Krugman on the Buffett Tax

Mr Obama would cut the federal rate from 35% to 28% and pay for it by limiting various deductions, such as those for depreciation and interest.

ECONOMIST: Taxes, spending and the deficit

This means we must be ready to give up the various deductions that we've grown accustomed to in order to get the marginal tax rates on our income reduced.

FORBES: Political Economy