The tax system that is placed in western countries is and was not the same tax system that was prevalent in 7th century.Tax is haram but the question is is tax evasion haram? Some might even say it's ***** perhaps to evade paying taxes. I guess you could say Trump is a *****i then.
Kings, Lords or rulers would use the tax to enrich themselves.
Tax today is use to build infrastructure, medical programs, education, etc.