¿Que? For most of the last half-millennium, taxes were assessed by head or collected at the border.Do you really want to fall back on the tax model of King George or King Herod?
the sales tax, especially one at 500% of what is "normal and customary", has never been applied is such a manor.
Are you just making this up as you go? The dominant tax model worldwide is the VAT, at rates around 15%, give or take a few points. If a 30% retail sales tax is five times what is :"normal and customary," I think there is at least one word there that I do not think means what you think it means.