Tenn. Code Ann. § 9-1-101: Fiscal year for state and county government

(a) The fiscal year of state government shall hereafter commence on July 1 of each year and end on the following June 30. This fiscal year shall be followed in making appropriations and in financial reporting, and shall be uniformly adopted by all departments, institutions, offices and agencies of state government.

(b) Unless otherwise allowed by the comptroller of the treasury upon grounds of special hardships, the fiscal year of the counties of the state shall begin on July 1 of each year and shall end on the following June 30. The fiscal year shall constitute the budget year and the year for accounting and reporting of each and every fund, office, department, institution, activity and agency of the county government, but the aforementioned provision shall be in addition to, and not in lieu of, any accounting and reporting now required of any official by general law.