The 2017 Tax Cuts and Jobs Act (TCJA) cut the federal corporate tax rate from 35% to 21% — a structural change that brought U.S. rates close to OECD averages but reduced corporate-tax revenue as a share of GDP.
Subsequent debates have focused on whether to raise the rate (proposed: 25-28%), broaden the base, or impose a corporate alternative minimum tax based on book income. The OECD/G20 negotiated a 15% global minimum tax (Pillar Two) that the U.S. has only partially implemented.
Defenders of low rates argue they attract investment and competitiveness. Critics argue corporate profits and stock buybacks have boomed while wage growth has been modest, suggesting the cuts didn't deliver promised gains.