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)
Judge Questions Why Correspondents’ Dinner Shooting Suspect Was Placed on
Suicide Watch
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A federal magistrate ordered that the D.C. Department of Corrections
explain why it had placed Cole Tomas Allen in especially restrictive
conditions.
2 hours ago