CRS – Changes in the Distribution of Income Among Tax Filers Between 1996 and 2006: The Role of Labor Income, Capital Income, and Tax Policy, Thomas L. Hungerford, Specialist in Public Finance, December 29, 2011
Three potential causes of the increase in after-tax income inequality between 1996 and 2006 are changes in labor income (wages and salaries), changes in capital income (capital gains, dividends, and business income), and changes in taxes. To evaluate these potential reasons for increasing income inequality, a technique to decompose income inequality by income source is used. While earnings inequality increased between 1996 and 2006, this was not the major source of increasing income inequality over this period. Capital gains and dividends were a larger share of total income in 2006 than in 1996 (especially for high-income taxpayers) and were more unequally distributed in 2006 than in 1996. Changes in capital gains and dividends were the largest contributor to the increase in the overall income inequality. Taxes were less progressive in 2006 than in 1996, and consequently, tax policy also contributed to the increase in income inequality between 1996 and 2006. But overall income inequality would likely have increased even in the absence of tax policy changes.”
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