Existing law establishes the California Interagency Council on Homelessness to identify mainstream resources, benefits, and services that can be accessed to prevent and end homelessness in California by creating partnerships between federal, state, local, and nonprofit entities. Existing law requires a state agency or department that administers one or more state homelessness programs, upon request of the council, to participate in council activities, as specified, and to provide to the council any relevant information regarding those state homelessness programs. This bill would require, commencing September 1, 2025, a state agency or department that administers one or more state homelessness programs to report annually to the council cost and outcome data for each program the agency or department administers, and would require the council, in coordination with each agency or department required to report to the council, as specified, to develop data collection and reporting procedures for this purpose. The bill would require the council to compile the data reported by agencies and departments and, commencing April 1, 2026, annually make that data available to the public.