Tenn. Code § 8-3432
The deduction provided for herein shall be made notwithstanding that the minimum compensation provided by law for any member shall be reduced thereby. Every member shall be deemed to consent and agree to the deductions made as provided herein; and payment of salary or compensation, less said deductions, shall be a full and complete discharge of all claims for service rendered by such person during the period covered by such payments, except as to benefits provided by chapters 34 to 36, inclusive of this title.
An amount equal to the taxes under the Federal Insurance Contributions Act payable by a class A member for the period beginning January 1, 1956, and ending on the date coverage under the Social Security Act is extended to such members shall be deducted from amounts credited to such member in the employee's fund, but should the account of a member, who became a class A member after September 30, 1957, but who occupied a position on said date to which Social Security coverage was extended, be reduced thereby to an amount which is less than the amount which would have been standing to his credit had he become a class A member on said date, such difference shall be paid by the member in a lump sum prior to September 30, 1959.
T.C.A. § 8-3432