The County offers a voluntary Deferred Compensation Plan in accordance with Section 457 of the Internal Revenue Code. The Contra Costa County Deferred Compensation Plan is a governmental 457(b) plan.Currently, CCCERA offers a deferred compensation plan in accordance with Section. The Board of Supervisors of Contra Costa County is accepting applications to fill a vacancy in the elected office of District Attorney. Meet your plan representatives. Get to know the knowledgeable professionals here to help you. A 457(b) plan is a tax-deferred retirement savings plan. Funds are withdrawn from an employee's income without being taxed and are only taxed upon withdrawal.