In contested divorce actions, mandatory self-disclosure requires litigating spouses to automatically disclose a long list of financial information.
In most cases, mandatory self disclosure includes recent pay information; tax information (returns if a couple filed separately); recent bank and brokerage statements; current statements about assets.
This information is conveyed in standardized forms, and is governed by the time standards of the court.
Nothing about mandatory self-disclosure prevents a third parties -- additional disclosures may be needed.
As a rule of thumb, mandatory self-disclosure includes all the financial information a couple would need if they were going to a financial planner to do estate planning for retirement.
See Discovery.