What is the Fair Tax... other than the Libertarian platform for tax reform? According to FairTax.org, "The Fair Tax Plan is a comprehensive proposal that replaces all federal income and payroll based taxes with an integrated approach including a progressive national retail sales tax, a prebate to ensure no American pays federal taxes on spending up to the poverty level, dollar-for-dollar federal revenue replacement, and, through companion legislation, repeal of the 16th Amendment.