Whenever cash flow is not sufficient to meet current expenses, which usually occurs as a result of inadequate accumulated fund balances, the county may issue revenue anticipation notes, subject to the approval of the state director of local finance. An important point: These notes must be paid off by June 30th of the fiscal year in which they are issued. This requirement insures against the approval of a deficit budget. T.C.A. §§ 9-21-801 through 9-21-803.