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. 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. We're talking about the homeowners' exemption in California. The main criteria are that the property must be your principal place of residence as of January 1st. Learn Everything You Need to Know About School Parcel Tax Exemptions in Santa Clara County.