Tennessee Code Title 8. Public Officers and Employees § 8-36-210

(1) The political subdivision authorizes and pays for the cost of an actuarial study to determine the liability associated with the granting of such benefits;

(2) Following the review of the cost of granting such benefits, the chief governing body of the political subdivision passes a resolution authorizing the provisions of this section for such members, and accepting liability for such benefits; and

(3) Any such member electing to be covered under this section pays to the retirement system in a lump sum the difference between what such member would have contributed had such member been a Group 2 member and the amount such member actually paid, plus interest at the rate provided in § 8-37-214.