I just do not see what stops them at any time either raising the national tax higher, or also going back an implementing some form of income tax again, as they love to target enemies using weaponized taxes.
They jever colect enough taxes to cover spending, they always have rationalizations for raising taxes or creating them.
One year later, oops, we need an income tax again, the “rich” arent paying their fair share.
Unless they have language that says there can never be any other form of taxation on citizens while a national sales tax exists, we have no insurance against this.
Yes.
See what I said in #50 above.