Tangible property owned, claimed, possessed or controlled in the conduct of a profession, trade or business may be subject to property tax. What is business personal property?Please complete the information and file the form with the tax collector. Fill out and copy your forms. Our California personal property tax experts answer common questions. California is unique and complex when it comes to managing property taxes. Examples of business property that would be assessed as personal property include but are not limited to: • Operating Supplies. To calculate your property taxes in Alameda County, you can use the formula: Assessed Value x Tax Rate = Property Taxes. Find information and due dates for unsecured personal and unsecured supplemental property taxes. Identify, assess, evaluate, and solve problems.