Cal. Rev. & Tax. Code § 38707
(a) Except as otherwise provided by law, any person who is engaged in the business of preparing, or providing services in connection with the preparation of, returns under Chapter 5 of this part, or any person who for compensation prepares any such return for any other person, and who knowingly or recklessly does either of the following, shall be guilty of a misdemeanor, and, upon conviction thereof, shall be fined not more than one thousand dollars ($1,000) or imprisoned no more than one year, or both, together with the costs of prosecution: