If you have some time, please check out my reply to this thread: Get rid of taxes completely
TL;DR, if we’re stuck with fiat, we might as well have the treasury just print the budget and have no federal taxes whatsoever. Bonus points if there’s a hard limit on the amount they can print, linked to middle-class prosperity. Even more bonus points if the individual “taxpayers” can choose their own spending bill to direct their share of the money printer.