Illinois garnishment rules are complex and favor judgment debtors.
To start learning about Illinois garnishment law, start with the Bills.com resource Illinois Collection Laws. This page explains some of the rights you and other Illinois residents share.
I can't find a definitive answer to your question, but it seems reasonable that any wages you earn could be garnished up the maximum amount allowed by state and/or federal law.
Because of the complexity of Illinois garnishment rules, the best advice I can give you is to consult with an Illinois attorney experienced in labor law, or make an appointment with Illinois Legal Aid.
You can also try contacting the Illinois Department of Labor.
I hope this information helps you Find. Learn & Save.