Illinois Landlord-Tenant Compliance (IL)
Launch Interactive Illinois Notice Builder →
Illinois Security Deposit Return Deadline & Late Fee Calculator (765 ILCS 710/1)
Under the Illinois Security Deposit Return Act (765 ILCS 710/1, applicable to lessors of 5 or more units), a landlord may not withhold any part of a security deposit unless they furnish an itemized statement of damage within 30 days of the date the lessee vacated the premises (with paid receipts provided within 30 days thereafter), and must return the security deposit in full within 45 days if no statement is furnished.
Statutory Return / Claim Window
45d Return / 30d Claim
Calendar days post-surrender
Late Fee Cap & Grace Period
Chicago/Cook County RLTO: $10 on first $500 + 5% on excess over $500
Grace Period: 5 days
Security Deposit Limit
No statewide cap (Cook County/Chicago local caps apply)
Quick Illinois Security Deposit Postmark Deadline Calculator
Mandatory Postmark Deadline:
2026-12-15
2027 Edition B2B Spreadsheet Operating Systems
Automate Your Entire Illinois Rental Portfolio in Microsoft Excel & Google Sheets
Download our unlocked 5-tab Landlord Portfolio OS ($29) or get all 5 Real Estate & Contractor Operating Systems (Landlord OS, BRRRR Underwriter, Airbnb/STR Tax OS, Contractor Estimate/Lien OS, & IRS Schedule E Tax OS) for $49.