What Financial Disclosure Means Under California's Premarital Agreement Law
Family Code section 1615 is the rule. California's premarital agreement statutes are known as the Uniform Premarital Agreement Act (Family Code section 1600). Section 1615(a) lists when a premarital agreement, which section 1610 defines as an agreement between prospective spouses "made in contemplation of marriage and to be effective upon marriage", cannot be enforced. One of the conditions is that the party resisting the agreement "was not provided a fair, reasonable, and full disclosure of the property or financial obligations of the other party."
Each of those three words does work. Fair points to honesty, so values are not shaded to look smaller. Reasonable points to a level of detail a sensible person could actually use. Full points to completeness, so nothing important is left off. A disclosure can be accurate in what it lists and still fall short if it leaves out something significant.
"Property" is defined broadly in section 1610. It means an interest, "present or future, legal or equitable, vested or contingent," in real or personal property, "including income and earnings." "Financial obligations" is the other half, meaning what a person owes. That covers loans, credit balances, taxes owed, and continuing payments such as support for a former spouse or a child.
Disclosure matters in both directions. The statute protects whichever party a spouse later tries to enforce the agreement against, so the partner with fewer assets discloses too. That partner's debts can matter as much as the other partner's holdings.
Prenup disclosure is also not the same thing as the disclosure that happens in a divorce. In a dissolution or legal separation case, Family Code section 2104 requires each party to serve a preliminary declaration of disclosure under penalty of perjury on a Judicial Council form, unless a court orders otherwise for good cause or another statute excuses it. The petitioner serves it with the petition or within 60 days of filing, and the respondent serves it with the response or within 60 days of filing the response. The parties' written agreement or a court order can extend those periods. That is a requirement at a different stage, under a different statute. Prenup disclosure happens before the wedding, as part of making the agreement.