65 ILCS 5/8-2-9.4
Passage of the annual budget by the corporate authorities shall be in lieu of passage of the appropriation ordinance as required by Section 8-2-9 of this Act. The annual budget need not be published except in a manner provided for in Section 8-2-9.9. Except as otherwise provided in this Section, the annual budget shall be adopted by the corporate authorities before the beginning of the fiscal year to which it applies. On and after January 1, 2020, if a disaster, state of emergency, or national emergency is declared within 60 days of the end of a municipality's fiscal year and the disaster, emergency, or declaration impacts the municipality, the time limit to pass the annual budget shall be extended for the duration of the disaster or emergency and for 60 days thereafter. During the extended period, the municipality may expend sums of money up to amounts budgeted or appropriated for those objects and purposes in the previous fiscal year to defray all necessary expenses and liabilities of the municipality.
65 ILCS 5/8-2-9.4