Research on the distribution of income during the 1980s has identified a trend towards increasing inequality, which may be the continuation and acceleration of trends spanning several decades. This paper explores to what extent behavioral responses to the tax changes during the 1980s may also explain the rising inequality. The 1986 Tax Reform Act is used as a natural experiment to explore the roles played by both taxes and a variety of nontax factors. Our principal finding is that both tax rates and nontax factors appear to have had significant effects on relative income growth during the late 1980s.

What Does the Taxable Income Elasticity Say About Dynamic Responses to Tax Changes? by Robert Carroll and Warren Hrung. Published in volume 95, issue 2, pages 426-431 of American Economic Review, May 2005

We investigate the effect of entrepreneurs' personal taxes on their use of labor, analyze the tax returns of sole proprietors before and after the Tax Reform Act of 1986, and determine how the substantial reductions in marginal tax rates affected their hiring decisions and wage bills. Individual income taxes exert a statistically and quantitatively significant influence on the probability of hiring workers. Raising the entrepreneur's “tax price” by 10% raises the mean probability of hiring by about 12%. Further, taxes influence total wage payments to workers. The tax‐price elasticity of the median wage bill is about .37.