Minn. Stat. § 355.02
Subd. 1. General authority.
(b) The agreement may contain those provisions relating to coverage, benefits, contributions, effective date, modification and termination of the agreement, administration, and other appropriate provisions as the director and the federal Secretary of Health and Human Services shall agree upon, but, except as may be otherwise required by or under the Social Security Act as to the services to be covered, such agreement must provide in effect that:
Subd. 2. Interstate instrumentality.
(a) Any instrumentality jointly created by this state and any other state or states is authorized, upon the granting of like authority by the other state or states, to:
Subd. 3. Groups covered by Social Security.
(a) The following groups having coverage under a retirement plan in section 356.30, subdivision 3, except clauses (4) and (7) must be covered by an agreement or a modification to an agreement between the director and the federal Secretary of Health and Human Services:
(b) The following groups must be covered prospectively following the referendum in subdivision 4 and the modification to the state Social Security agreement under subdivision 1:
Subd. 4. Referendum.
The director shall authorize and supervise a referendum under section 218(d)(6)(C) of the Social Security Act to be held on the date or dates set by the local governmental subdivision or by the special authority or district desiring inclusion under subdivision 3, paragraph (b). The referendum must permit each eligible employee the opportunity to elect Social Security coverage. The notice of referendum required by section 218(d) of the Social Security Act must contain a statement sufficient to inform the person of the rights which accrue under the Social Security Act and the employee contribution rates applicable to the program. The cost of the referendum must be borne by the governmental subdivision. The director, on receiving satisfactory evidence that the conditions required by section 218 of the Social Security Act have been met, must so certify to the Secretary of Health and Human Services.
Subd. 5. Retroactive Social Security coverage.
An employee or elected official who elects Social Security coverage under subdivision 4 may obtain retroactive coverage for the period specified in the modification of the agreement if the individual is employed by the local governmental subdivision or by the special authority or district on the date of the modification of the agreement. The employee or elected official must pay an amount equal to the taxes which would have been imposed on the person by the Federal Insurance Contributions Act had the service been covered at the time performed. The employing local governmental subdivision or special authority or district must pay the necessary employer contributions for the retroactive period. Nothing in this section requires an employee or elected official to elect retroactive Social Security coverage.