This comes close to the science fiction story where every transaction was subject to a "Floating Instantaneous Sales Tax", or FIST. Every time you agreed to buy something, you paid with your hand held computer, which automatically added the FIST, so of course you could see it. And every time Congress voted for a spending bill, the FIST was automatically increased.
However, there was a check and balance -- if half the people in a congressional district got pissed off enough to punch their red button on their computer, a small explosive charge would go off in the back of the head of their congressman. :)
That should be a Constitutional Amendment!