What is an unsecured property tax? It is an ad-valorem (value based) property tax that is the liability of the person or entity assessed for the tax.Total of 103 forms are available for Contra Costa County for 2024. The interment application will not be complete until all the Next of Kin complete the Financial Statement. Everything you need to know about Contra Costa Property Tax, including rates, laws, and ways to reduce your bills. For more information on these statements or to request a Business Property Statement, please call the Assessor's Office at (858) 505-6100. We have audited the basic financial statements of the governmental activities and each major fund of the Contra. Retirement Association Act 37 retirement plan. 8. Part-time faculty must complete a Withholding Tax Statement (W-4),. If NO, sign and complete the certification on page 2.