The annual budget shall be considered at the first regular monthly meeting of the council in September and at subsequent meetings until a budget is adopted for the ensuing year. The meetings shall be so conducted as to give interested citizens a reasonable opportunity to be heard. The council shall also hold a public hearing on the budgets. The council may revise the proposed budgets but no amendment to the budgets shall increase the authorized expenditure to an amount greater than the estimated income. The council shall adopt the budgets by resolution no later than the dates required by the laws of Minnesota. The council shall also adopt a resolution levying the amount of taxes provided in the budgets and the finance director shall certify the tax resolution to the county auditor in accordance with state law.