Just a reminder: 70% tax rates won't work

Since the era of 70% tax rates, the U.S. income tax system has become far more “progressive.” Congressional Budget Office estimates show that from 1979 to 2007 average income tax rates fell by 110% to minus 0.4% from 4.1% for the second-poorest quintile of taxpayers. Average tax rates fell by 56% for the middle quintile and 39% for the fourth, but only 8% at the top. Despite these massive tax cuts for the bottom 80%, overall federal revenues were the same 18.5% share of GDP in 2007 as they were in 1979 and individual tax revenues were nearly the same—8.7% of GDP in 1979 versus 8.4% in 2007.

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In short, reductions in top tax rates under Presidents Kennedy and Reagan, and reductions in capital gains tax rates under Presidents Clinton and George W. Bush, not only “paid for themselves” but also provided enough extra revenue to finance negative income taxes for the bottom 40% and record-low income taxes at middle incomes.

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