I’ve mad it as clear as it is humanly possible to make it Lewis! The fact that YOU don’t “get it” surprises me not a whit!
Ignorance is bliss in Fairtax land.
You earn $100k. You pay $20K...It's gone, get it?
How could the money ($20K) you don't have be a percentage of the money ($80K) you have left?...It can't/doesn't/never could/never will.