Ultimately, it won't be

The FairTax plan would be a huge departure from the current scheme - in a nutshell, it effectively abolishes the IRS and eliminates income and property taxes. All taxation occurs through a 23% sales tax, so the more you spend, the more taxes you pay. A monthly "prebate" check is sent out which covers cost of basic necessities, to avoid undue burden on the impoverished.
The biggest problem I see with something like this that makes sense and eliminates so many loopholes is that those who best benefit from said loopholes are also most able to see that the system isn't changed out of their favor in the first place.