The total amount of temporary indebtedness incurred for current expenses and debt service shall, at no time, exceed an amount equal to the State appropriations not received but payable during the fiscal year, and the tax levied upon property taxable for school purposes within such school district, and remaining uncollected and unpledged for the current fiscal¹ year. All such loans shall be paid out of the receipts available, or pledged for the repayment thereof when and as the funds are received. The total amount of the temporary indebtedness for such purpose remaining unpaid at the close of the fiscal year shall become an obligation upon the following year's budget, and be included therein.