"Based on standard assumptions, the Tax Cuts and Jobs Act reduced tax liability of most households, with
a larger effect on after-tax income for high-income households. According to estimates from the Tax Policy Center in the first column of Table 3, 80 percent of tax filing units received a tax cut; the average tax cut overall tax units was $1,610 in 2018. After-tax income rose by 2.2 percent on average, but by only
0.4 percent for households in the lowest quintile, compared with 1.6 percent and 2.9 percent for those in the middle and top quintile respectively, more than 4 percent for those in the ninety-fifth–ninety-ninth percentiles, and 3.4 percent for taxpayers in the top 1 percent. The differences in dollars are more extreme:
$60 for those in the bottom quintile, $930 for the middle quintile, and $51,140 for the top 1 percent