735 ILCS 5/12-803
The wages, salary, commissions and bonuses subject to collection under a deduction order, for any work week shall be the lesser of (1) 15% of such gross amount paid for that week or (2) the amount by which disposable earnings for a week exceed 45 times the Federal Minimum Hourly Wage prescribed by Section 206(a)(1) of Title 29 of the United States Code, as amended, or, under a wage deduction summons served on or after January 1, 2006, the minimum hourly wage prescribed by Section 4 of the Minimum Wage Law, whichever is greater, in effect at the time the amounts are payable. This provision (and no other) applies irrespective of the place where the compensation was earned or payable and the State where the employee resides. No amounts required by law to be withheld may be taken from the amount collected by the creditor. The term "disposable earnings" means that part of the earnings of any individual remaining after the deduction from those earnings of any amounts required by law to be withheld.
735 ILCS 5/12-803