Russia, Saudi Arabia, Ukraine, Serbia and the Republic of Abkhazia. Each of these countries use a flat tax system.
Dr. Ben Carson's Biblical tithe plan is essentially a 10% flat tax. Just like in Albania, Kazakhstan, Turkmenistan, Mongolia, and the Republic of Abkhazia.
More countries that have a flat tax system (Wiki page)
Harry Bliss’s “City Living” - Françoise Mouly talks to the illustrator Harry Bliss about “City Living,” his cover for the June 25, 2018, issue of The New Yorker.
20 minutes ago