Lease Agreement Template Illinois — Free IL Lease (2026)

An Illinois lease agreement is a legally binding contract between a landlord and tenant that outlines the terms of renting residential or commercial property in Illinois. Illinois law governs these agreements under the Illinois Landlord and Tenant Act (765 ILCS 705), which establishes the rights and responsibilities of both parties. A properly drafted Illinois lease agreement template should include the standard terms — rent amount, lease duration, security deposit, property description — plus Illinois-specific statutory provisions.

Using a lease agreement template designed for Illinois ensures you include the correct legal references and disclosures required by state law. Our generator automatically adds the relevant Illinois statutory clauses, including security deposit handling, required disclosures, and the Chicago Residential Landlord Tenant Ordinance (RLTO) provisions where applicable. This saves you from having to research local housing law and ensures your lease is compliant from day one.

Illinois has specific security deposit regulations that your lease agreement must address. Under the Illinois Security Deposit Interest Act (765 ILCS 715), landlords who own buildings with 25 or more units must pay interest on security deposits. The interest rate is determined by the rate paid by the largest commercial bank in Illinois. The deposit must be returned within 30 days of the tenant moving out, with an itemised list of any deductions within 30 days.

For leases in Chicago, the RLTO imposes additional requirements: landlords must provide a receipt for the security deposit and store it in a separate account. Failure to comply can result in damages of up to twice the deposit amount plus attorney's fees. Our Illinois lease agreement template includes all required security deposit language so you stay compliant whether you're renting in Chicago, Springfield, or Peoria.

Illinois law requires several specific disclosures in a residential lease agreement. The Radon Awareness Act (420 ILCS 46) requires landlords to disclose any known radon hazards and provide the Illinois Emergency Management Agency radon guide. The lead-based paint disclosure is required for properties built before 1978 under federal law. Additionally, the Illinois Carbon Monoxide Alarm Detector Act requires carbon monoxide detectors within 15 feet of every sleeping room.

For Chicago properties, the RLTO requires a summary of the ordinance to be attached to every lease. Landlords must also disclose whether the property has bedbug history and provide the Chicago Bedbug Information Sheet. Our generator includes all mandatory disclosures automatically based on the property's location within Illinois.

The Chicago Residential Landlord Tenant Ordinance (RLTO) is one of the most tenant-friendly laws in the United States. It applies to most rental properties within Chicago city limits and imposes strict requirements on landlords, including: mandatory interest on security deposits, required lease translations if the tenant's primary language is Spanish, Chinese, or Polish, and limitations on late fees (no more than $10 per month for rent under $3,000).

Non-compliance with the RLTO can be costly — landlords can be liable for up to twice the security deposit, two months' rent, and attorney's fees. If your rental property is in Chicago, our template automatically includes the RLTO summary attachment reference and the required fair housing notice. For a comparison with other major US cities, see our New York lease agreement template or our general residential lease agreement template.

Illinois does not have a statutory grace period for rent payments — it's determined by the lease agreement. However, many municipalities require a 5-day grace period before late fees can be applied. Under the Illinois Rent Slip Prevention Act, late fees must be reasonable and disclosed in the lease. For Chicago properties under the RLTO, late fees are capped at $10 per month for rent under $3,000 and $15 per month for rent over $3,000.

A 5-day notice is required for non-payment of rent in Illinois. If the tenant does not pay within 5 days, the landlord can file for eviction. Our lease agreement template includes a clear late fee clause with the correct jurisdiction-specific language, ensuring your fee terms are enforceable in court. You can also review our guide on what to include in a lease agreement for more details.