Cal. Probate Code § 21523

(a) The Economic Recovery Tax Act of 1981 was enacted August 13, 1981. This section applies to an instrument executed before September 12, 1981 (before 30 days after enactment of the Economic Recovery Tax Act of 1981). (b) If an instrument described in subdivision (a) indicates the transferor’s intention to make a gift that will provide the maximum allowable marital deduction, the instrument passes to the recipient an amount equal to the maximum amount of the marital deduction that would have been allowed as of the date of the gift under federal law as it existed before enactment of the Economic Recovery Tax Act of 1981, with adjustments for the following, if applicable: (1) The provisions of Section 2056(c)(1)(B) and (C) of the Internal Revenue Code in effect immediately before enactment of the Economic Recovery Tax Act of 1981. (2) To reduce the amount passing under the gift by the final federal estate tax values of any other property that passes under or outside of the instrument and qualifies for the marital deduction. This subdivision does not apply to qualified terminable interest property under Section 2056(b)(7) of the Internal Revenue Code.