35 ILCS 135/3-5: Sunset of exemptions, credits, and deductions.

The application of every exemption, credit, and deduction against tax imposed by this Act that becomes law after the effective date of this amendatory Act of 1994 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.