"Key drivers for Estonia’s high rank are its relatively low corporate tax rate at 21 percent with no double taxation of dividend income, a nearly flat 21 percent income tax rate, a property tax that only taxes the value of land and not the value of building and structures, and a territorial tax system that exempts 100 percent of foreign profits."

So 21% I guess

http://taxfoundation.org/blog/estonia-has-most-competitive-t...