Comparing Corporate Income Tax Rates Across Countries

These numbers just look at Federal Tax Rates. The study by the Cato Institute reporting these numbers also notes:

A number of countries are initiating or phasing-in further corporate tax-rate cuts in coming years, including Australia, Canada, Ecuador, Israel, Japan, New Zealand, and the United Kingdom. In some countries, such as Israel and Japan, these are straight rate cuts. In other countries, such as New Zealand and the United Kingdom, rate cuts are being paired with base-broadening measures. When these reforms are in place, the average effective tax rate in 2014 will be 18.0 percent in the OECD and 17.4 percent among all 83 countries. . . .