Cal. Code Regs. tit. 18, § 13801.1
(a) Transfer by Will or Laws of Succession.
In the case of a transfer by will or pursuant to the laws of succession, the specific exemption in effect at the date of the transferor's death is the exemption applicable.
(b) Transfer Inter Vivos.
(1) On or After June 25, 1935.
In the case of a transfer during the life of the transferor made on or after June 25, 1935 (the effective date of the Inheritance Tax Act of 1935), the exemption in effect at the date of the transferor's death is the exemption applicable.
(2) Prior to June 25, 1935.
(B) The exemption in effect at the date of the transferor's death is the exemption applicable, if the transfer was incomplete (see Section 13304.2).
Note: Reference: Section 13801, Revenue and Taxation Code.
In the case of a transfer during the life of the transferor made prior to June 25, 1935: