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What is the US Fair Tax?
You asked about the challenges. The transition itself is the biggest one. For people to get used to the tax at the register vs at their paycheck. For a great number of people to find new work. I don't know the numbers, but anyone involved with personal income taxes would be out of work. Sales tax is already part of the process in most states, bumping it to a federal tax wont add too much in overhead.  I make no moral judgment, but consider, most prostitutes and drug dealers are avoiding income tax, but they still are buying the same goods in stores you and I are. This proposed tax reduces the collection noncompliance, and brings more people into "the system".  Another factor some may not like is the ability to affect behavior by picking and choosing what to promote, via deductions, such as home buying or charity.