The regular filing deadline is February 15th to receive the full exemption. To claim the exemption, the homeowner must make a one-time filing with the county assessor where the property is located.Complete a homestead declaration form. Complete form BOE-266, Claim for Homeowners'. Property Tax Exemption. Welcome to the homestead estimated amount page for Single Family Detached homes for Santa Clara county. The Office of the Assessor provides a variety of exemptions available on the assessed value of a parcel if certain qualifications are met. 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 86 forms are available for Santa Clara County for 2024. Funding for the program comes from a parcel tax on Santa Clara County properties each year.