General information only, not legal advice. Laws change. Verify requirements with a licensed attorney or the statute before acting. Last reviewed: June 2026.
Security Deposit · IL
Illinois security deposit law
Key rules for landlords and tenants in Illinois, cited to 765 ILCS 710/1.
At a glance
- Max deposit
- No statutory limit (state law; Chicago RLTO has additional rules)
- Return deadline
- 30 days (with deductions) or 45 days (if deductions disputed)
- Interest required
- Yes (Interest required if landlord owns 25+ units and deposit held more than 6 months)
- Statute
- 765 ILCS 710/1
- Last reviewed
- June 2026
Frequently asked questions
What is the maximum security deposit in Illinois?
No statutory limit (state law; Chicago RLTO has additional rules). (765 ILCS 710/1, last reviewed June 2026.)
How long does a landlord have to return a security deposit in Illinois?
30 days (with deductions) or 45 days (if deductions disputed). The landlord must provide an itemized statement of any deductions. Failure to return on time may entitle the tenant to penalties under 765 ILCS 710/1.
Is interest required on security deposits in Illinois?
Yes. Interest required if landlord owns 25+ units and deposit held more than 6 months
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