Herman Cain 84% of Americans would have their taxes increased under 9-9-9

I agree that his plan would raise taxes for most people, but I am a little confused about how they came to 84%. In the report it says that "The bases of all three taxes are essentially the same as the base of a national sales tax" and that "the three taxes combined are equivalent to a 25.38 percent national sales tax".

Can anyone explain to me how an income tax can be essentially the same as a sales tax? One is based on the outflow of money and the other is based on the inflow of money. I don't exactly see how they can equate the two.
 
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