Internal Audit reporting structure

Hi all,
I report administratively to our CEO, and he determines salary, etc., and performs an annual evaluation, though I report to the Audit/Supervisory committee also. I'm looking for some feedback on how your reporting structure works; who do you report to or has control over your annual audit plan, salary determination and performance evaluation, time off, etc.? Your CEO or Supervisory committee, or a combination of the two? Thanks for any feedback you can provide!