marginal tax rate

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amount of tax imposed on an additional dollar of income. In the U.S. progressive income tax system, the marginal tax rate increases as income rises. Economists believing in supply-side economics hold that this reduces the incentive to be productive and discourages business investment. In urging that marginal tax rates be cut for individuals and businesses, they argue that the resulting increased work effort and business investment would reduce stagflation.
See also flat tax.

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The rate at which income over a certain amount is taxed. Although in general, graduated income taxes impose higher tax rates on higher incomes, the tax rate does not rise for each additional dollar earned. Rather, it rises by income brackets, and each tax rate applies only to income that falls in that bracket. For example, in 2002, the highest marginal federal tax rate was 38.5 percent, which for single taxpayers was imposed on income in excess of $54,000.

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The amount of tax paid on an additional dollar of income. As income rises, so does the tax rate.

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Many believe this discourages business investment by removing the incentive to work harder.

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