We've just released a new study on corporate taxation around the globe. Bottom line: the U.S. is a global leader in yet another area—high corporate tax rates... The United States has the highest overall corporate income tax rate (39.3 percent combined federal and sub-federal) among all countries in the Organization for Economic Cooperation and Development (OECD) (see table below). Japan (39.0 percent) and Germany (38.9 percent) have the second and third highest corporate income tax rates. The nation with the lowest corporate income tax rate in the OECD is Ireland (12.5 percent).