Cal. Rev. & Tax. Code § 19384

The action provided by Section 19382 shall be filed within four years from the last date prescribed for filing the return or within one year from the date the tax was paid, or within 90 days after (a) notice of action by the Franchise Tax Board upon any claim for refund, or (b) the determination (including the issuance of a decision, opinion, or dismissal) by the State Board of Equalization on an appeal from the action of the Franchise Tax Board on a claim for refund becomes final pursuant to Section 19334, whichever period expires the later.