STATEMENTS. This claim may be used to file for the Homeowners' Exemption for the Assessment Roll and the Supplemental Assessment Roll. Disabled applicants must complete form DTE 105E,.Download PDF BOE-266 REV. Exemptions ; 11930, Transfer into or out of a trust. Interests transferred outright to, or in trust for the benefit of any person or entity. Welcome to the homestead estimated amount page for Single Family Detached homes for Contra Costa county. Exemption forms are due June 30th each year. Once forms are filed exemption is automatically renewed each year. How to File a Homestead Exemption. A homeowner must file for the homestead exemption with the correct county recorder's office.