The State of Illinois Deferred Compensation Plan is a supplemental retirement program for State employees. Tax Social Security, Comments.NACo's Deferred Compensation Program has helped more than 1.5 million county employees and retirees save for and live comfortably in retirement. Find your employer's plan. §457 Contributions. This voluntary plan, called the SURS Deferred Compensation Plan (DCP), provides members an avenue to save more and generate additional income in retirement.