All Illinois Courts must accept these forms. Scroll down below the chart for important information on how to fill out these forms.An Illinois eviction notice allows a landlord to warn a tenant that they have violated their lease agreement and must vacate the premises. The first step is to file a summons and complaint with the clerk of the court. Take advantage of our Notice to Vacate Letter template to terminate your lease agreement legally. Use our services to create a valid legal document. Use our Easy Form programs to help you create the forms you need. Download our free Illinois eviction notice forms and use them to evict tenants for nonpayment or noncompliance. Customize and Download this "Illinois Notice to Vacate". Below is a template you can use when writing your notice to vacate letter.