Cal. Rev. & Tax. Code § 19525

The Franchise Tax Board, under regulations prescribed by the Franchise Tax Board, may establish a reward program for information resulting in the identification of underreported or unreported income subject to taxes imposed by Part 10 (commencing with Section 17001) or Part 11 (commencing with Section 23001). Any reward may not exceed 10 percent of the taxes collected as a result of the information provided. Any person employed by or under contract with any state or federal tax collection agency shall not be eligible for a reward provided for pursuant to this section.