President Obama argues that the election gave him a mandate to raise taxes on high earners, and the White House indicates that he won't compromise on this issue as the so-called fiscal cliff approaches.
But tax rates are already high—much higher than is commonly understood—and increasing them will likely further depress the economy, especially by affecting the number of hours Americans work.
Taking into account all taxes on earnings and consumer spending—including federal, state and local income taxes, Social Security and Medicare payroll taxes, excise taxes, and state and local sales taxes—Edward Prescott has shown (especially in the Quarterly Review of the Federal Reserve Bank of Minneapolis, 2004) that the U.S. average marginal effective tax rate is around 40%. This means that if the average worker earns $100 from additional output, he will be able to consume only an additional $60.
Research by others (including Lee Ohanian, Andrea Raffo and Richard Rogerson in the Journal of Monetary Economics, 2008, and Edward Prescott in the American Economic Review, 2002) indicates that raising tax rates further will significantly reduce U.S. economic activity and by implication will increase tax revenues only a little.
High tax rates—on both labor income and consumption—reduce the incentive to work by making consumption more expensive relative to leisure, for example. The incentive to produce goods for the market is particularly depressed when tax revenue is returned to households either as government transfers or transfers-in-kind—such as public schooling, police and fire protection, food stamps, and health care—that substitute for private consumption.
In the 1950s, when European tax rates were low, many Western Europeans, including the French and the Germans, worked more hours per capita than did Americans. Over time, tax rates that affect earnings and consumption rose substantially in much of Western Europe. Over the decades, these have accounted for much of the nearly 30% decline in work hours in several European countries—to 1,000 hours per adult per year today from around 1,400 in the 1950s.
Changes in tax rates are also important in accounting for the increase in the number of hours worked in the Netherlands in the late 1980s, following the enactment of lower marginal income-tax rates.