Tenn. Code Ann. § 6-35-311: Annual audit

At the end of each fiscal year, an audit shall be made of the accounts and funds of the city covering the operations of the past fiscal year, by a certified public accountant selected by the council. The council may employ certified public accountants to audit all or any of its accounts and funds at the time it takes office or at any time it may deem expedient to assure correctness thereof.