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.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Site Timeline is a site by and for consumers of financial services and advice. We are not affiliated with any of the banks, financial services or software manufacturers discussed here. All logos and trade names are the property of their respective owners.

Tax and financial advice you come across on this site is freely given by your peers and professionals on their own time and out of the kindness of their hearts. We can guarantee neither accuracy of such advice nor its applicability for your situation. Simply put, you are fully responsible for the results of using information from this site in real life situations.