Credit by state of overpayment of taxes by county, when

In all cases in which any county has heretofore or shall hereafter pay into the state treasury a greater amount of money than is or may be due from such county for the year in which such surplus money was paid, it shall be the duty of the director of accounts and reports and treasurer of state, at the close of each fiscal year, to credit such overpaid or surplus amount to the county paying the same as a credit upon the taxes due or thereafter to become due from such county to the state.