Tenn. Code § 17-511
Each judge who is a member shall contribute to the fund from the date he becomes a member, four per cent (4%) of earnings.
Every member shall be deemed to consent and agree to the payroll deductions made as provided in this chapter; and the payment of salaries and the payment of compensation, less such deductions shall be full and complete discharge of all claims for services as judge rendered by such members to the county during the period covered by such payment.
Any member who is entitled to prior service as defined in § 17-501(f) may claim same by applying to the board, showing the periods of service claimed and furnishing evidence thereof satisfactory to the board, and upon paying to the state treasurer in a lump sum a total contribution equal to four per cent (4%) of the compensation he received for any such service plus common interest at the rate of five per cent (5%) per annum from the date or dates of such prior service.
Upon actual retirement no further contributions on the part of a retired judge or his beneficiary shall be required.
T.C.A. § 17-511