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)
Headlines from the Life-style Blog of an Increasingly Anxious Ivanka Trump - Dana Schwartz writes satirical headlines for the tense, uneasy blog posts that Ivanka Trump might write in order to hide her terror.
32 minutes ago