California Code, Revenue and Taxation Code - RTC § 45202

Except in the case of fraud, intent to evade this part or rules and regulations adopted under this part, or failure to make a report or return, every notice of a determination of an additional amount due shall be served within three years after the date when the amount was required to have been paid or the report or return was due, or within three years after the report or return was filed, whichever period expires later. In the case of failure to make a report or return, the notice of determination shall be served within eight years after the date the report or return was due.