65 ILCS 5/8-3-17

The corporate authorities of a municipality may not impose a tax on any tuition or fees received by a public or private post-secondary educational institution or on any student with respect to his or her being enrolled in such an institution. This Section is a denial and limitation under subsection (g) of Section 6 of Article VII of the Illinois Constitution of the power of a home rule municipality to impose a tax in violation of this Section.