"California is considered a "Community Property" state. Community property is defined as all property and debt that was acquired from the date of marriage until the marital cut-off date. The community assets will be split equally by the Superior Court if the spouses are unable to reach an agreement.
California: Cal. Fam. Code �� 1600 to 1617
1610. As used in this chapter:
(a) "Premarital agreement" means an agreement between prospective spouses made in contemplation of marriage and to be effective upon marriage.
(b) "Property" means an interest, present or future, legal or
equitable, vested or contingent, in real or personal property,
including income and earnings.
1611. A premarital agreement shall be in writing and signed by both parties. It is enforceable without consideration." -
Divorce Support - California Property Division Factors
An agreement or a pre-nup can override the 50/50 rule in Cali.