Not so. From Cain's official website:
Individual Flat Tax 9%. Gross income less charitable deductions.
I think there's more to learn about Cain's plan. Someone upthread mentioned they'd have to pay the 9% sales tax on utilities. In interviews, Cain has said utilities, property tax, car payments, mortgage/rent, inurance are not subject to the 9% sales tax. I think he may have said healthcare is exempt as well, but I'm not entirely sure. None of this is on his website, though. I'd like to see him get into more details like this, and post it in a FAQ on his website.
That is interesting given we sell Cain999 as ending loopholes for corporations and the wealthy.
Foundations serve as a central loophole for limo-socialists protect their wealth from taxation.