California Code, Family Code - FAM § 920

(a) The right arises regardless of which spouse applies the property to the satisfaction of the debt, regardless of whether the property is applied to the satisfaction of the debt voluntarily or involuntarily, and regardless of whether the debt to which the property is applied is satisfied in whole or in part. The right is subject to an express written waiver of the right by the spouse in whose favor the right arises.

(b) The measure of reimbursement is the value of the property or interest in property at the time the right arises.

(c) The right shall be exercised not later than the earlier of the following times: