Cal. Rev. & Tax. Code § 43603

Any person who knowingly or willfully files a false tax return with the board, and any person who refuses to permit the board or any of its representatives to make any inspection or examination for which provision is made in this part, or who fails to keep records as prescribed by the board, or who fails to preserve such records for the inspection of the board for such time as the board deems necessary, or who alters, cancels, or obliterates entries in such records for the purpose of falsifying the records is guilty of a misdemeanor and shall be punished by a fine of not less than one hundred dollars ($100) nor more than one thousand dollars ($1,000), or by imprisonment in the county jail for not less than one month nor more than six months, or by both such fine and imprisonment.