Cal. Rev. & Tax. Code § 18640
(a) Any corporation allocating amounts as patronage dividends, rebates, or refunds (whether in cash, merchandise, capital stock, revolving fund certificates, retain certificates, certificates of indebtedness, letters of advice, or in some other manner that discloses to each patron the amount of the dividend, refund, or rebate) shall render a correct return that shall contain or be verified by a written declaration that it is made under the penalty of perjury, stating both of the following:
(2) The amount of those allocations to each patron.
If required by the Franchise Tax Board, any corporation described in this subdivision shall render a correct return, which shall contain or be verified by a written declaration that it is under penalty of perjury, of all patronage dividends, rebates, or refunds made during the calendar year to its patrons. This section shall not apply in the case of any corporation exempt from tax under Article 1 (commencing with Section 23701) of Chapter 4 of Part 11.
(b) Every cooperative required to make a return under subdivision (a) shall furnish to each person whose name is required to be set forth in that return a written statement showing both of the following: