To obtain the exemption, the claimant must be an owner or co-owner or a purchaser named in a contract of sale. Download PDF BOE-266 REV.To qualify for the homeowners' exemption, the home must have been the principal residence of the owner as of January 1 of that tax year. Total of 103 forms are available for Contra Costa County for 2024. Exemption forms are due June 30th each year. Once forms are filed exemption is automatically renewed each year. Only one can file on this homestead with the two other owners listed as occupying joint owners. Check YES if the property is intended as your principal residence, and indicate the date of occupancy or intended occupancy. See "Forms of Title for Multiple Owners," below, for examples of how these are entered onto the deed. There are two common ways an individual can own property: (1) as a tenant in common or (2) as a joint tenant.