620 ILCS 50/66
The fiscal year of the Commission shall correspond to the fiscal year of the county and in case of a joint Commission shall be the fiscal year of the county having the greater population.
The Commission shall make a progress report each month to the county board, and within one month after the close of such fiscal year, shall make a full and complete report of its activities and transactions.
The Commission, not later than thirty days prior to the end of the fiscal year, shall prepare a budget, and appropriation ordinance, in the same form and manner as is now prescribed by law for counties, and file the same with the county board, and shall certify to the county board the sum or sums necessary and require to be raised by taxation to defray the cost of constructing, operating, repairing, maintaining, improving and acquiring the airports under its jurisdiction for the next fiscal year.
620 ILCS 50/66