Greg Mankiw's Blog: Inequality Wars. Quoting Alan Reynolds in the Wall Street Journal.
As was well-documented years ago by economists Roger Gordon and Joel Slemrod, a great deal of the apparent increase in reported high incomes has been due to "tax shifting." That is, lower individual tax rates induced thousands of businesses to shift from filing under the corporate tax system to filing under the individual tax system, often as limited liability companies or Subchapter S corporations.
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Switching income from corporate tax returns to individual returns did not make the rich any richer. Yet it caused a growing share of business owners' income to be newly recorded as "individual income" in the Piketty-Saez and Congressional Budget Office studies that rely on a sample of individual income tax returns. Aside from business income, the top 1%'s share of personal income from 2002 to 2004 was just 7.2% — the same as it was in 1988.
In short, income shifting has exaggerated the growth of top incomes.
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