Illinois Security Deposit Return Act: How to Sue Your Landlord in Small Claims Court

What the Law Actually Requires

The Illinois Security Deposit Return Act (765 ILCS 710/1) applies to residential landlords who receive a security deposit; the five-unit threshold was removed effective January 1, 2024. To withhold any part of a deposit for property damage, the landlord must provide an itemized statement and paid repair receipts (or copies) within 30 days after the tenant vacates or the right to possession ends, whichever is later. If the required statement and receipts are not provided, the full deposit must be returned within 45 days after the tenant vacates. If receipts cannot be produced through no fault of the landlord, the statute allows a verified explanation and other available evidence.

If the landlord does not provide the required itemized statement and receipts within 30 days (or the substitute evidence allowed by subsection (b)), the landlord may not withhold any part of the deposit for property damage. If the court finds the landlord refused to provide the itemized statement or supplied it in bad faith, and failed or refused to return the deposit due within the statutory time limits, the landlord is liable for twice the amount of the deposit due, plus court costs and reasonable attorney's fees.

Chicago has its own overlay: the Residential Landlord and Tenant Ordinance (RLTO) applies to most Chicago residential rentals and adds requirements like mandatory interest payments on deposits and specific penalties for noncompliance. Outside Chicago, the state act applies statewide; check whether a local ordinance adds requirements for the property location.

When Small Claims Court Is the Right Move

Small claims court in Illinois handles money-only claims up to $10,000. Most security deposit disputes fall well within that range. You don't need a lawyer — the whole system is designed for individuals to represent themselves.

The statute of limitations for security deposit claims depends on whether your lease was written (10 years under 735 ILCS 5/13-206) or oral (5 years under 735 ILCS 5/13-205). You almost certainly have time, but don't sit on it.

Before filing, send a written demand letter via certified mail. State the amount owed, cite the Security Deposit Return Act, give a 14-to-30-day payment deadline, and keep a copy with the postal receipt. Judges pay attention to whether you made a reasonable effort to settle.

How to Name the Right Defendant

This is where deposit cases go wrong. Identify the landlord or other party legally responsible for returning your deposit. Do not assume the property owner, management company, or leasing office is always the correct defendant.

If the property is owned by an LLC or corporation, search the Illinois Secretary of State Business Services database for the exact legal entity name and registered agent address. The name on your lease might not match the legal entity name on file, and suing the wrong entity means starting over.

For individual landlords, use their full legal name.

Filing Your Case

File in the county where the rental property is located — that's your proper venue under 735 ILCS 5/2-101.

For deposits of $2,500 or less, use the simplified complaint form under Supreme Court Rule 282. For larger deposits up to $10,000, use the standard Small Claims Complaint. Either way, attach a copy of your lease to the complaint (required under 735 ILCS 5/2-606 for contract-based claims).

Filing fees range from about $87 to $114 for claims under $2,500, and $266 to $284 for higher amounts, depending on the county. Fee waivers are available if your household income is at or below 125% of federal poverty guidelines.

What to Bring to Court

Your evidence package should include:

• The signed lease
• Move-in and move-out inspection records or photos
• Your demand letter and the certified mail receipt
• Any written communication with the landlord or management company about the deposit
• Bank statements showing the deposit payment
• Photos of the unit's condition when you left

The judge needs to see that you fulfilled your end of the lease and that the landlord failed to comply with the statutory return timeline.

The Illinois Small Claims Filing Guide walks through the complete filing sequence for security deposit claims, including a service tracking log and evidence organizer you can print and bring to court.

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