Tenn. Code Ann. § 5-13-106

Excepting taxes such as the county trustee is authorized to collect, the payment of all moneys to the county trustee by any collectors authorized by statute, or by anyone on account due the county, shall be made only by issuance of a receivable warrant signed by the county mayor instructing the trustee to receive the amount named, for which the trustee shall issue a receipt, a duplicate of which shall be delivered to the director of accounts and budgets to be used by the director in posting the accounting records.