Cal. RTC § 7153.5

Notwithstanding any other provision of this part, any person who violates this part with intent to defeat or evade the reporting, assessment, or payment of a tax or an amount due required by law to be made is guilty of a felony when the amount of unreported tax liability aggregates twenty-five thousand dollars ($25,000) or more in any 12-consecutive-month period. Each offense shall be punished by a fine of not less than five thousand dollars ($5,000) and not more than twenty thousand dollars ($20,000), or imprisonment for 16 months, two years, or three years, or both the fine and imprisonment in the discretion of the court.