35 ILCS 128/1-155

The application of every exemption, credit, and deduction against tax imposed by this Act that becomes law after the effective date of this Act shall be limited by a reasonable and appropriate sunset date. A taxpayer is not entitled to take the exemption, credit, or deduction beginning on the sunset date and thereafter. If a reasonable and appropriate sunset date is not specified in the Public Act that creates the exemption, credit, or deduction, a taxpayer shall not be entitled to take the exemption, credit, or deduction beginning 5 years after the effective date of the Public Act creating the exemption, credit, or deduction and thereafter.