In a divorce proceeding, Family Code 2104 tells us what each party must disclose to the other party in order to advance the divorce case to a settlement conference or a trial:
(1) Each party shall serve on the other party a preliminary declaration of disclosure, executed under penalty of perjury on a form prescribed by the Judicial Council. The commission of perjury on the preliminary declaration of disclosure may be grounds for setting aside the judgment, or any part or parts thereof, pursuant to Chapter 10 (commencing with Section 2120 ), in addition to any and all other remedies, civil or criminal, that otherwise are available under law for the commission of perjury. The preliminary declaration of disclosure shall include all tax returns filed by the declarant within the two years prior to the date that the party served the declaration.
(2) The preliminary declaration of disclosure shall not be filed with the court, except on court order. However, the parties shall file proof of service of the preliminary declaration of disclosure with the court.