237.061  Budget and parts thereof must balance.--If, when a tentative budget has been prepared in accordance with regulations of the state board, the proposed expenditures, plus transfers, and balances exceed the estimated income, transfers, and balances, the proposed tax levy shall be increased, if that is possible without exceeding the maximum millage authorized by the voters and the millage which may be authorized by the board pursuant to law. If such increase is not possible, the appropriations, transfers, or reserves shall be reduced so that the budget and each of the parts thereof will balance.