Tenn. Code Ann. § 8-20-107: Costs and attorney's fees

(a) The cost of all cases must be paid out of the fees of the office collected by such officers, and they and each of them must be allowed a credit for the same in settlement with the county trustee.

(b) An award of attorney's fees must be consistent with and awarded pursuant to Rule 8 of the Rules of the Supreme Court of the State of Tennessee, Rules of Professional Conduct 1.5, or the corresponding subsequent rule of the Tennessee supreme court. The court shall determine the reasonableness of attorney's fees for all parties, and in making that determination, the court shall consider the factors in Rule 8 of the Rules of the Supreme Court of the State of Tennessee, Rules of Professional Conduct 1.5.