"Of course, most people don't feel that their taxes have fallen sharply. And they're right: taxes that fall mainly on middle-income Americans, like the payroll tax, are still near historic highs. The decline in revenue has come almost entirely from taxes that are mostly paid by the richest 5 percent of families: the personal income tax and the corporate profits tax. These taxes combined now take a smaller share of national income than in any year since World War II."