So corporate and individual tax compliance was $225 billion + 279 billion, or $507 billion. A little off of your $800 billion number just for corporate compliance, isn't it?
That was just one small sample of what you have chosen to overlook, however, Payne's 65 cents per tax dollar collected calculates a much higher value than $800billion in 2000,
The Flat Tax; Hall & Rabushka, '95:
What the Income Tax Cost the American People
Notes & References:
A comprehensive review of all the studies that attempt to measure the costs associated with the federal income tax appears in James L. Payne, Costly Returns: The Burdens of the U.S. Tax System (San Francisco: Institute for Contemporary Studies Press, 1993). Payne summarizes the estimates of compliance costs that appear in the following studies: Joel Slemrod and Nikki Sorum, "The Compliance Cost of the U.S. Individual Income Tax System," National Tax Journal 37 (December 1984): 462–65; Arthur D. Little, Inc., Development of Methodology for Estimating the Taxpayer Paperwork Burden (Washington, D.C.: Internal Revenue Service, 1988), pp. III–23; James T. Iocozzia and Garrick R. Shear, "Trends in Taxpayer Paperwork Burden," in Internal Revenue Service, Trend Analyses and Related Statistics, 1989 Update (Washington, D.C.: U.S. Government Printing Office, 1989), p. 56; Annual Reports of the commissioner of the Internal Revenue Service; and a variety of other IRS memoranda
As the response here demonstrated:
http://www.freerepublic.com/focus/f-news/1160242/posts?page=497#497