Yes he is proposing a flat income tax. One where everybody pays including the 50% that don't pay now. So nationally that nets a yield of 18% compared to the existing system.
More revenue in at less cost for those who already pay taxes. The ones that don't will bitch about it. Of course there's Huntsman's plan, whoever he is.
999 is touted as if that is/will be the entire tax burden.9% sales tax added to a 3% state sales tax added to a 8% city sales tax = 20% sales tax. 20 cents on every dollar spent is a LOT.