STATEMENTS. This claim may be used to file for the Homeowners' Exemption for the Assessment Roll and the Supplemental Assessment Roll. Please Download PDF BOE-266 REV.A special tax statement is required to determine if any value exists. The tax exemption is for the value of the lien and does not include any equity of value. Once forms are filed exemption is automatically renewed each year. Complete and submit the application: Obtain the right form from the county assessor's office (or their website) and fill it out accurately. Here's the good news for them, plus anyone else: you can apply now to get the littlepublicized homeowners' exemption tax break going forward. Navigate your Contra Costa County property taxes with ease. Use our calculator, review assessment values, and find ways to save money with Ownwell. Service Fee Information.