Fill out this form and submit it via mail for processing. Learn more about how to start receiving income in the Learning Center.Submit your forms as follows: 1) Inquries and questions can be sent via email to the Plan. Does my participation in a deferred compensation plan affect my benefits from Middlesex County Retirement System? A voluntary retirement savings plan that provides quality investment options, investment educational programs and related services. (the "Hospital") established the Middlesex Retirement. Mandatory Retirement Plan Contributions. Do not complete this Enrollment Form if you are already enrolled in the 457 or 401(k) Plan and wish to elect Roth (after-tax) deferrals. Eligible employees can save and invest before-tax and after-tax dollars through salary deferrals into our wide array of low fee investments options.