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.The Contra Costa County Employees' Retirement Association ("CCCERA") invites organizations to submit proposals on providing IRC 457(b) Deferred. The District also offers a Deferred. Deferred Compensation Plan. Contra Costa Federal Credit Union. •. How do I make contribution changes?