Cal. Education Code § 25006

(a) The board may declare an additional earnings credit to be applied to Defined Benefit Supplement accounts for a plan year. Prior to declaring an additional earnings credit, the board shall consider all of the following: (1) Whether the plan’s investment earnings with respect to the Defined Benefit Supplement Program for the plan year exceed the amount required to meet the liabilities identified in paragraphs (2), (3), and (4). (2) The amount required for the plan year to credit interest on members’ nominal accounts at the minimum interest rate. (3) The amount of the plan’s administrative expenses with respect to the Defined Benefit Supplement Program for the plan year. (4) The sufficiency of the Gain and Loss Reserve and whether any additions must be made to that reserve. (b) For any plan year that the board declares an additional earnings credit, the board shall specify the amount to be added to members’ accounts as a percentage increase. The additional earnings credit shall be applied to the balance of credits in each member’s nominal account as of the last day of the plan year and shall be applied as of the date specified by the board. The additional earnings credit shall not be added to the balance of credits transferred from a member’s Defined Benefit Supplement account to the Annuitant Reserve. (c) The declaration of an additional earnings credit shall be made as a plan amendment adopted by the board with respect to the Defined Benefit Supplement Program upon recommendation of the actuary based on the actuarial valuation undertaken following the plan year pursuant to Section 22311.5, but no later than June 30 following the end of the plan year.