35 ILCS 5/225
For taxable years beginning on and after January 1, 2017, a taxpayer shall be allowed a credit in the amount paid by the taxpayer during the taxable year for instructional materials and supplies with respect to classroom based instruction in a qualified school, or the maximum credit amount , whichever is less, provided that the taxpayer is a teacher, instructor, counselor, principal, or aide in a qualified school for at least 900 hours during a school year.
The credit may not be carried back and may not reduce the taxpayer's liability to less than zero. If the amount of the credit exceeds the tax liability for the year, the excess may be carried forward and applied to the tax liability of the 5 taxable years following the excess credit year. The tax credit shall be applied to the earliest year for which there is a tax liability. If there are credits for more than one year that are available to offset a liability, the earlier credit shall be applied first.
For purposes of this Section, the term "materials and supplies" means amounts paid for instructional materials or supplies that are designated for classroom use in any qualified school. For purposes of this Section, the term "qualified school" means a public school or non-public school located in Illinois.
For purposes of this Section, the term "maximum credit amount" means
This Section is exempt from the provisions of Section 250.
35 ILCS 5/225