25 property tax bills have been mailed. Can the county assessor prorate assessments or taxes between the buyer and seller of taxable personal property?BOE forms (Information only. Obtain forms from either the County Assessor or the Clerk of the Board in the county where the property is located). Secured Property Tax (ex. Personal Property Tax Declaration. Living in beautiful Santa Clara County, California means paying property taxes if you own your home. If I file an appeal do I still have to pay the property tax bill? Pay with online home banking through your personal financial institution or bank. The Treasurer and Tax Collector mails the Annual Secured Property Tax Bills each year in October to every owner listed on the Secured Tax Roll.