The Minnesota Deferred Compensation Plan (MNDCP) is a voluntary savings plan intended for long-term investing for retirement. If you have questions about the deferred compensation plan, please contact the Minnesota Deferred Compensation Plan at 1-800-657- 5757. 4.The county currently offers merit employees the opportunity to voluntarily set aside a portion of their income and invest it for retirement. The Minnesota Deferred Compensation 457b Plan or mndcp is available to all public employees who work for the state. This booklet is a summary of information for Fairfax County employees retiring on a. Normal Service, Early Service or Deferred Vested Retirement. This plan offers a tax-deferred savings plan that can help supplement other retirement benefits.