Illinois constitution
Article VI
Section 14

Judges shall receive salaries provided by law which shall
not be diminished to take effect during their terms of
office. All salaries and such expenses as may be provided by
law shall be paid by the State, except that Appellate,
Circuit and Associate Judges shall receive such additional
compensation from counties within their district or circuit
as may be provided by law. There shall be no fee officers in
the judicial system.