Tennessee Code Title 47. Commercial Instruments and Transactions § 47-15-104

(A) Permissible at the time the contract to make the loan is executed;

(B) Permissible at the time the loan is made;

(C) Permissible at the time the interest rate on the loan is converted from a variable to a fixed rate, or from one fixed rate to another fixed rate, whether such conversion is by terms of the contract or by renewal, modification, extension or otherwise;

(D) Permissible at the time of any renewal or extension of the loan or any note evidencing the loan; or

(E) Permissible by virtue of any combination of any of the foregoing.

(A) That authorized by statute at the agreed time of each variance; or

(B) That authorized at the time of execution of the contract or note evidencing the indebtedness upon which such variable rate is or is to be charged.