Corporate tax
Corporate tax revenues fell from around $300 billion in 2017 to $200 billion in 2018, a $100 billion or 33% reduction, due to the Tax Cuts and Jobs Act, which reduced the corporate tax rate from 35% to 21%, along with other changes. Corporate tax revenues fell from 1.5% GDP in 2017 to 1.0% GDP in 2018, relative to the 1980-2007 average of 1.8%. CBO reported in 2018 that increasing the corporate tax rate by 1 percentage point would increase revenue collections by $100 billion total for the 2019-2028 period.