Amends the State Mandates Act. Provides that any State mandate regarding any subject matter enacted on or after the effective date of the amendatory Act that necessitates additional expenditures from local government revenues shall be void and unenforceable unless the General Assembly makes necessary appropriations and reimbursements to implement that mandate. Provides that the failure of the General Assembly to make necessary appropriations and reimbursements shall relieve the local government of the obligation to implement any State mandate. Makes conforming changes. Amends the Property Tax Extension Limitation Law in the Property Tax Code. Provides that a taxing district shall reduce its aggregate extension base for the purpose of lowering its limiting rate for future years upon referendum approval initiated by the submission of a petition by the voters of the district. Provides that the extension limitation shall be: (a) the lesser of 5% or the average percentage increase in the Consumer Price Index for the immediately preceding 10 years; or (b) the rate of increase approved by the voters. Amends the Illinois Income Tax Act. Increases distributions into the Local Government Distributive Fund on and after August 1, 2024. Effective immediately.