Stats or survey on high-earning finance and accounting line of work/business

I am looking for some statistics, surveys, or data on the earning power (salary, revenue) of various types of finance and accounting work and business.
I know of a salary guide, but that only contains employment work. Does anything know of any figures that include self-employ work and running a business in this field?
I don't mind data coming from several sources as long as I can compile them together. This is for a research on comparing employed work in the finance and accounting field with finance and accounting professional who has gone out and seek independant work/set up business.
Thanks for any information. If this seems confusing, please respond and I will explain more clearly what I need.
Thanks.
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