On 8 March 2017, the U.S. Congressional Budget Office (CBO) published its report: International Comparisons of Corporate Income Tax Rates. The report examines statutory, average, and effective marginal corporate tax rates and the factors that affect them for the U.S. and other G20 member countries. For the U.S., the top statutory corporate tax rate is 39.1%, the average rate is 29%, and the effective rate is 18.6%, which in comparison with other G20 countries, ranks the U.S. as the highest for statutory rate, and the third and fourth highest for average and effective rates respectively.