The former Bain executive has pledged to eliminate capital gains taxes for households with income under $200,000. Roberton Williams explains how this would work in reality:

Nearly 80 percent of households already pay no tax on gains and dividends—either because they have no investment income or because they’re in the 15-percent tax bracket or below. This cut—about $40 billion in 2015—can only help the remaining 20 percent. Not surprisingly, the bulk of benefits go to high-income households. And, because the threshold would apply only to non-gains and non-dividend income, households in the top 1 percent would get nearly a tenth of the tax savings.