Illinois security deposit law is primarily governed at the state level, but Chicago has its own Residential Landlord and Tenant Ordinance (RLTO) that provides significantly stronger protections for tenants within the city. If you rent in Chicago, your rights are among the strongest in the country.

The Short Answer

Illinois landlords must return your security deposit within 30 days of you vacating. For buildings with 25 or more units, landlords must pay interest on deposits held for more than 6 months. Chicago’s RLTO provides additional protections including stricter penalties for landlords who violate the rules.

Illinois State Law vs. Chicago RLTO

Illinois state law (765 ILCS 710) provides baseline protections, but Chicago tenants should look to the Chicago Residential Landlord and Tenant Ordinance for more comprehensive rules.

This guide covers both — with Chicago specifics noted.

Security Deposit Limits

Illinois state law does not cap the amount a landlord can charge as a security deposit. Chicago’s RLTO also does not set a cap, but common market rates are typically 1-2 months’ rent.

The 30-Day Return Deadline

Under Illinois state law, landlords must return your deposit (or provide an itemized statement of deductions) within 30 days of you vacating.

Chicago RLTO: Landlords must return the deposit within 30 days after the tenant vacates. If they intend to make deductions, they must provide a written itemized statement with receipts or estimates within 30 days, and return any balance within 45 days.

Interest on Security Deposits (Chicago and Large Buildings)

This is one of Illinois’s most distinctive rules:

Chicago landlords must pay annual interest on security deposits held for 6 months or more. The interest rate is set each year by the City Comptroller.
State law (765 ILCS 710) requires landlords of buildings with 25 or more units to hold deposits in interest-bearing accounts and pay interest annually at the rate of 0.5% per year or the rate the account earns, whichever is higher.

If your landlord fails to pay required interest, they may owe you the interest amount plus penalties.

What Can Be Deducted?

Both state law and the Chicago RLTO allow deductions for:

Unpaid rent
Damage beyond normal wear and tear
Cleaning costs if the unit was left significantly dirty

Chicago RLTO requirement: Itemized deductions must be accompanied by receipts for work done or written estimates from contractors. Without documentation, deductions may be unenforceable.

Normal Wear and Tear in Illinois

Normal wear and tear (cannot deduct):

Nail holes from hanging pictures
Minor scuffs and marks from regular use
Carpet wear from normal foot traffic
Faded paint

Damage (can deduct):

Large holes in walls
Stained or burned carpet or flooring
Broken fixtures or appliances due to misuse
Excessive dirt or damage requiring extraordinary cleaning

Penalties for Violations

Illinois state law: If a landlord fails to return the deposit within 30 days without proper notice of deductions, the tenant may be entitled to twice the deposit amount plus attorney’s fees.

Chicago RLTO: If a landlord fails to comply with the RLTO’s deposit rules, the tenant may recover the deposit plus twice the deposit amount (i.e., triple the deposit total) plus attorney’s fees. This is one of the strictest penalties in the country.

How to Get Your Deposit Back in Illinois

Give written notice of your move-out date and forwarding address to your landlord
Document the unit’s condition with photos and video before and after
Wait 30 days after you vacate
Send a written demand letter by certified mail if the deposit isn’t returned
File in Illinois small claims court — the limit is $10,000

Chicago tenants can also contact the City of Chicago’s Department of Housing for guidance or a referral to a tenant rights organization.

Key Sources

Illinois Security Deposit Return Act (765 ILCS 710): Read at ILGA.gov
Chicago RLTO: Chicago.gov

Real Situations in Illinois

Illinois statewide law has no security deposit limit, but the Chicago Residential Landlord and Tenant Ordinance (RLTO) provides significantly stronger protections for tenants in the city of Chicago. Among the most important: Chicago landlords must hold security deposits in a federally insured interest-bearing account, disclose the name and address of the bank, and pay interest on the deposit annually (currently at a rate set by the City Comptroller). Failure to pay interest — or to provide the required bank disclosure — entitles the tenant to a refund of the entire deposit plus damages, regardless of whether there were legitimate deduction claims.

This interest and disclosure requirement is the source of a large number of Chicago RLTO claims. Landlords who collect a deposit in Chicago but never disclose the bank, never pay annual interest, or hold the deposit in their personal checking account are in violation — and tenants can use these violations to force full deposit return even when the unit genuinely needed cleaning or repairs at move-out.

Outside Chicago, tenants in suburban Cook County, DuPage, Lake, and other collar counties operate under the less protective statewide law, with a 30-day return deadline and 2× damages for bad-faith withholding. The geographic line matters considerably.

Common Mistakes Illinois Tenants Make

Not checking whether the Chicago RLTO applies to their unit. The RLTO covers most rental units in Chicago, but there are exemptions (owner-occupied buildings with 6 or fewer units, condominiums where the owner lives in the building, etc.). Knowing whether you’re covered by the RLTO or just state law determines which rules and remedies apply to your deposit.

Not requesting the required bank disclosure. Chicago landlords must provide written disclosure of the bank and account number where your deposit is held. If they never gave you this disclosure, request it in writing. Failure to provide it — or holding the deposit in a non-qualifying account — is an independent RLTO violation that entitles you to return of the deposit regardless of other circumstances.

Missing the 30-day demand deadline under state law. Outside Chicago, if you want to sue for deposit violations, send your written demand within a reasonable time after the 30-day return deadline passes. Waiting months to assert your claim can undermine your position even if the landlord was clearly in the wrong.

Tenant Rights Guide: Know Your Rights in Every State — the complete hub for tenant protections, eviction laws, and landlord obligations
Illinois Eviction Notice Requirements — what your landlord must do before starting eviction proceedings in Illinois
Illinois Small Claims Court — how to sue your landlord for a wrongfully withheld deposit without a lawyer
Illinois Wage Theft Laws — Illinois wage laws, overtime rights, and how to recover unpaid wages
Illinois Tenant Rights Guide — complete tenant rights guide for Illinois renters

This article is for informational purposes only and does not constitute legal advice. Laws in Chicago differ from state law. Always verify current rules at the sources linked above or consult a licensed Illinois attorney. Last reviewed: March 2026.

Illinois Security Deposit Laws: 30-Day Return Rule and Interest Requirements