How Landlords Sue for Unpaid Rent in Illinois Small Claims Court

Small Claims for Money, Eviction Court for Possession

This is the most important distinction for landlord cases: small claims court handles money — you sue to recover the dollar amount of unpaid rent. If the tenant is still in the property and you want them out, that is an eviction action under Article IX of the Code of Civil Procedure (735 ILCS 5/9-101 et seq.), which is a separate proceeding with different forms and rules.

If you also seek possession of the property, file a separate eviction case under Article IX. This guide covers the money claim only.

Confirm the Dollar Amount

Calculate the total unpaid rent, including any amounts owed under the lease that the security deposit does not cover. If you held a security deposit, deduct any legitimate withholding before filing — the judge will ask about this.

Keep your claim at or below $10,000 to stay in small claims. If the total owed exceeds that, you can waive the excess and file in small claims for $10,000, or file in the general civil division for the full amount.

Send a Demand Letter

Mail a formal demand to the tenant's last known address by certified mail, return receipt requested. The demand should state the specific months of unpaid rent, the dollar amount for each, the total owed, and a deadline to pay (14 to 30 days).

If the tenant has already vacated, use the forwarding address they provided (or the one you have from prior communications). If you have no current address, check online people-search tools or the USPS mail-forwarding database — you will need a valid address to serve the summons later.

Identify the Right Parties

Review the lease and any guaranty to determine which tenants or co-signers agreed to be responsible for the unpaid rent; whether they are jointly and severally liable depends on those documents.

If you are filing as an individual landlord or sole proprietor, you file in your own name. If your rental property is owned by an LLC or corporation, you must hire a lawyer — under Supreme Court Rule 282(b), business entities cannot file small claims pro se.

File and Serve

File through eFileIL in a county where a defendant resides or where the rental transaction or part of it occurred — often the county where the rental property is located. Attach a copy of the lease and your rent ledger showing the unpaid months.

Serve the tenant. If they still live at the property, clerk certified mail under Rule 284 or sheriff service are the standard options. If they have moved, you need their current address — sheriff service requires serving them at a physical location.

At the Hearing

Bring three copies of:

• The signed lease
• Your rent ledger or accounting showing exactly which months are unpaid
• The demand letter with proof of mailing
• Any communications from the tenant acknowledging the debt or disputing it
• Security deposit records showing how the deposit was applied (if applicable)

The judge will want to see a clear paper trail: what was owed, when it was due, what was paid, and what remains outstanding. If the tenant does not appear, you request a default judgment with a prove-up of damages.

Collecting the Judgment

If the tenant does not pay after judgment, enforcement options include a citation to discover assets (compelling the tenant to disclose income and bank accounts), wage garnishment (up to 15% of gross wages), and bank account garnishment. Post-judgment interest is generally 9% per year; consumer debt judgments of $25,000 or less accrue interest at 5% per year.

The Illinois Small Claims Filing Guide covers the filing process, service methods, and hearing preparation in detail — useful whether you are suing for one month's rent or the maximum $10,000.

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