It is true that high-income Americans carry the biggest tax burden. While fewer than 1 in 20 families make more than $200,000, they pay almost half of all federal taxes. However they feel about the tax man, there is a case to be made that they can pay much more....a growing body of research suggests not only that the government could raise much more revenue by sharply raising the top tax rates paid by the richest Americans, but it could do so without slowing economic growth. Top tax rates could go as high as 80 percent or more.
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The New York Times