An Illinois Eviction — Complaint is a legal document filed by a landlord to begin the process of evicting a tenant from a rental property. The complaint outlines the reasons for the eviction and is filed with the court. There are two types of Illinois Eviction — Complaint: 1. For Non-Payment of Rent: This type of complaint is filed when a tenant has failed to pay rent on time and in full. The complaint will detail the amount of rent owed and the date it was due. 2. For Cause: This type of complaint is filed when the landlord believes the tenant has violated the terms of the lease, such as causing damage to the property or engaging in illegal activity. The complaint will detail the violation and provide evidence of the violation. Once the complaint is filed, the tenant will receive a summons from the court. The tenant will then have a certain amount of time to respond to the complaint. If the tenant fails to respond or does not contest the complaint, the landlord may be granted an eviction order from the court.