The Tar Reform Act of 1986 combined a variety of base-broadening and b
ase-reducing reforms with reductions in the number and levels of margi
nal income tar rates. An important feature of this legislation is its
effect on vertical tar equity. After examining individual income tar r
eturns filed in 1983 and 1988, this article concludes that the progres
sivity of the federal income tax was increased by tar reform.