Cal. Rev. & Tax. Code § 17952.5
(b) For purposes of this section, “qualified retirement income” means income from any of the following:
(9) Any plan, program, or arrangement described in Section 3121(v)(2)(C) of the Internal Revenue Code, or any plan, program, or arrangement that is in writing, that provides for retirement payments in recognition of prior service to be made to a retired partner, and that is in effect immediately before retirement begins, if that income is either of the following:
(A) Part of a series of substantially equal periodic payments (not less frequently than annually), which may include income described in paragraphs (1) to (8), inclusive, made for either of the following: