On the first Tuesday in September of each year, or within ten days thereafter, the board of county commissioners shall levy the necessary taxes for the current fiscal year on all taxable property in the county. The taxes shall be based upon an itemized estimate of the county expenses for the ensuing year. No greater levy of county tax may be made upon the taxable property of any county than will be equal to the amount of such expenses, with an excess of five percent of the same.
SDCL 10-12-8