Tennessee Code Title 45. Banks and Financial Institutions § 45-4-602

(1) The applicable formula rate; or

(2) The rate of interest permitted to be charged by credit unions chartered by the federal government.

(1) Be determined in accordance with the actuarial method;

(2) Be calculated, in the case of a precomputed loan, on the assumption that all scheduled payments will be made as contracted; and

(3) Not be affected by the prepayment of the loan, in whole or in part.