Complete a homestead declaration form. Sign your declaration in front of a notary.Download PDF BOE-266 REV. Disabled applicants must complete form DTE 105E,. To claim the exemption, the homeowner must make a one-time filing with the county assessor where the property is located. Edit, sign, and share homestead san bernardino county online. No need to install software, just go to DocHub, and sign up instantly and for free. Fill out a new application and mail to the address noted above. Please indicate what is being changed and when the change is effective. The new California Homestead Exemption was introduced through AB 1885 on Sept 18, 2020.