Former Big 5 accounting firm partner and now B-school prof Hank Adler lays out an outline for judging the proposed "Fair Tax" in "A Hard Look At The Fair Tax."

Footnote 1 to the outline is missing.  I got it from Hank.  It reads:

[1]As discussed in Purchasing Power vs. the Tax Rate, H.R. 25 proposes a tax inclusive sales tax rate of 23% on all retail purchases of goods and services. Sales taxes are traditionally described and administered on a tax exclusive basis. This is a distinction with a significant difference. A 23% tax inclusive sales tax rate is precisely equal to a 29.87013% (rounded to 30%) tax exclusive rate. This paper refers to the tax rate as proposed in H.R. 25 as 30% so that the tax rate may be more accurately compared and contrasted with other tax rates which are traditionally described on a tax exclusive basis.