A licensee who seeks to collect a contingent fee shall comply with the rules of the AICPA, PCAOB, SEC and other recognized public or private standard-setting bodies as applicable to the professional services being performed.
49 Pa. Code § 11.25
The provisions of this §11.25 issued under section 506 of The Administrative Code of 1929 (71 P. S. § 186); and section 3(10)-(12) of The CPA Law (63 P. S. § 9.3(10)-(12)).