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.Your income needs will depend on your debt and retirement lifestyle. If you are participating in a deferred compensation plan—a 457(b) or a. The Minnesota Deferred Compensation Plan is a voluntary savings plan to supplement your pension and social security income at retirement. This plan offers a tax-deferred savings plan that can help supplement other retirement benefits.