Enroll to schedule payment of your property taxes upon notification, due date or a more convenient date - on or before each installments delinquent date. Due date of filing annual business property statement.Payments on a collections account can be made at any Contra Costa County Superior Court location Monday-Friday, am to pm (except holidays). The MyCitations online tool allows you to enter a plea and make an ability to pay requests on eligible infractions without going to court. When Are Property Taxes Due in Contra Costa County? Each application becomes available on October 1 one year prior to the academic year, with a filing deadline of June 30 at the end of the academic year. The October 16, 2023, deadline applies to the quarterly estimated tax payments, normally due on January 17 and April 18, 2023. At Contra Costa College, we provide essential resources to support your academic journey. Our comprehensive support services are designed to help you succeed.