[Bigun]

If the Fair Tax brings in the same amount of money as the income tax, where will the funding for the new entitlement program come from?

First there is no "entitlement program" and secondly the money for the tax prebate comes form the exact same place as your standard deduction under the income tax does. Taxpayers!

[Mojave]

The President’s Advisory Panel for Federal Tax Reform cited the rebate as one of their chief concerns when analyzing their national sales tax, stating that it would be “the largest (entitlement program) in American history”, and contending that it would “make most American families dependent on monthly checks from the federal government”.

http://www.taxreformpanel.gov/final-report/TaxReform_Ch9.pdf

You just got spanked again.