I am sure it has been discussed before in older threads, but I didn't see it after looking through the first 2 pages of old threads so I'm making a new one. This is regarding a flat sales tax model that exempts food tax in the U.S. I admit I had a hard time finding any reliable information on how much is going untaxed, so if you happen to have reliable sources (i.e. NOT Fox , MSNBC, Huffington Post, LA Times, BBC, NPR, or other know biased sources the list is very long...) I would like to try and figure out exactly how much is not being taxed to accurately figure revenue different sales tax rates would generate in comparison to our current tax system. Please be constructive and include links to information sources.