Illinois Security Deposit Return Law & Calculator
Calculate your 30-day itemization deadline, 45-day final return window, verified 2026 Chicago interest rate (0.01%), and 2x statutory non-compliance damages.
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Illinois & Chicago Security Deposit Deadline Calculator
Calculate statutory return dates, required itemization milestones, 2026 accrued interest, and net refund obligations.
Chicago RLTO applies to multi-unit city rentals (exempting owner-occupied 6 units or fewer).
Statutory clocks commence on the date the tenant vacates and delivers possession.
Interest applies if held > 6 months.
If statement was received after 30 days, statutory forfeiture is triggered.
Final Refund Deadline (45 Calendar Days)
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Postmark or delivery deadline under 765 ILCS 710/1 & RLTO § 5-12-080(d).
Chicago RLTO § 5-12-080(f) awards 2x deposit plus interest and attorney's fees under strict liability.
Mail it by Certified Mail – $29
Proof of mailing and delivery sent via USPS Certified Mail with electronic return receipt. Tracked in your dashboard.
Deposit Evidence Pack – $9
Checklist of Illinois move-out photos, RLTO escrow demand notices, and itemized deduction challenge templates.
1. The Illinois Statewide 30-Day & 45-Day Two-Step Timeline (765 ILCS 710/1)
Under the Illinois Security Deposit Return Act (765 ILCS 710/1), residential landlords in buildings with 5 or more units must adhere to a strict two-step statutory timeline:
Step 1: 30 Calendar Days (Damage Statement)
If the landlord claims deductions for physical damage caused to the premises, they must deliver an itemized statement of the alleged damages and an estimated or actual cost of repairing or replacing each item within 30 calendar days of the date the tenant vacates.
Step 2: 45 Calendar Days (Final Refund)
If no damages are claimed, the lessor must return the 100% full deposit within 45 calendar days after the tenant vacates. If deductions were claimed in an itemized statement, the remaining balance must also be delivered within 45 calendar days.
Both deadlines begin on the calendar date the lessee physically vacates and surrenders the rental unit. Delivery must be made in person or by postmarked mail to the tenant's last known address.
2. Chicago RLTO (§ 5-12-080): Separate Escrow, Strict Liability & Move-In Fee Culture
Rental units located within the City of Chicago are governed by Chapter 5-12 of the Municipal Code of Chicago (the Residential Landlord and Tenant Ordinance, or RLTO). The RLTO applies to virtually all Chicago rentals, except owner-occupied buildings of 6 or fewer units (MCC § 5-12-020).
Segregated Escrow Account & No Commingling (§ 5-12-080(a))
A landlord must hold all security deposits in a federally insured, interest-bearing account in a financial institution located in the State of Illinois. The deposit funds remain the tenant's property and cannot be commingled with personal or operating assets of the landlord, nor subjected to the claims of the landlord's creditors.
Mandatory Written Bank Receipt (§ 5-12-080(b))
The landlord must provide the tenant with a written receipt specifying the deposit amount, the date received, the owner's name, a description of the unit, the signature of the person accepting funds, and the specific name and address of the financial institution where the deposit is held.
Why Chicago Has a Non-Refundable "Move-In Fee" Culture
Because technical violations of § 5-12-080 carry automatic double-deposit penalties plus attorney's fees under strict liability, many Chicago property managers do not collect security deposits. Instead, they charge a non-refundable "move-in fee" (standardly $300 to $600) which is completely exempt from RLTO escrow, interest, and return regulations.
3. Verified 2026 Chicago Deposit Interest Rate (0.01%) & Historical Rates Table
Under Municipal Code of Chicago §§ 5-12-081 and 5-12-082, the City Comptroller evaluates commercial bank interest rates annually in December and announces the official rate for the subsequent calendar year.
City of Chicago Official Comptroller Notice (Verified on chicago.gov):
For rental agreements governed by Chapter 5-12 from January 1, 2026, through December 31, 2026, the official security deposit interest rate is 0.01%.
Source: City of Chicago Department of Housing (chicago.gov interest rate service). Benchmark based on average rates at Chase Bank (Savings 0.01% and 6-month CD 0.01%).
6-Month Trigger: Landlords must pay interest on all security deposits and prepaid rent held for more than 6 months (§ 5-12-080(c)).
Payment Timing: Interest must be paid to the tenant within 30 days after the end of each 12-month rental period (by cash or credit against rent due) or returned with the deposit within 45 days of move-out.
City of Chicago Historical Security Deposit Interest Rates
| Year | Annual Rate | Year | Annual Rate | Year | Annual Rate |
|---|---|---|---|---|---|
| 2026 | 0.01% | 2022 | 0.01% | 2014 | 0.013% |
| 2025 | 0.01% | 2021 | 0.01% | 2013 | 0.023% |
| 2024 | 0.01% | 2020 | 0.01% | 2010 | 0.073% |
| 2023 | 0.01% | 2015–2019 | 0.01% | 2006 | 1.71% |
Note for properties outside Chicago: Under the Illinois Security Deposit Interest Act (765 ILCS 715/), interest is required statewide only for properties containing 25 or more units where deposits are held for 6+ months.
4. Suburban Cook County (CCRTLO): 30-Day Return Standard
Tenants residing in suburban Cook County outside the City of Chicago are protected by the Cook County Residential Tenant Landlord Ordinance (CCRTLO), enacted in 2021:
30-Day Total Window: Unlike the Chicago RLTO's 45-day final window, CCRTLO landlords must return the security deposit and any itemized deduction notice within 30 calendar days of the tenant vacating.
Municipal Exclusions: CCRTLO applies throughout suburban Cook County except in municipalities that enforce their own local landlord-tenant ordinances (such as Chicago, Evanston, and Mount Prospect).
CCRTLO Penalties: Failure to return the deposit or provide the itemized statement within 30 days subjects the landlord to statutory damages of up to two times the deposit amount plus attorney's fees.
5. Small Buildings with 1 to 4 Units: Scope & Common Law Protections
A frequent point of confusion for Illinois renters concerns duplexes, three-flats, and single-family rental homes:
State Act Exemption: Section 1 of the Illinois Security Deposit Return Act (765 ILCS 710/1) expressly restricts coverage to "lessor[s] of residential real property containing 5 or more units." If your building has 1 to 4 units outside Chicago and Cook County, 765 ILCS 710 does not govern your lease.
Contract Terms Control: For exempt small buildings, the return timeline is dictated first by the written lease agreement. If the lease specifies 30 days, that contractual term binds both parties.
Common Law Prohibits Unjustified Retention: Even without 765 ILCS 710, small landlords cannot arbitrarily keep deposits. Under Illinois common law, security deposits remain the tenant's property held in trust. The landlord must prove actual out-of-pocket repair costs in Small Claims Court to justify any deduction.
6. Mandatory Contractor Receipts, Vendor Invoices & Statutory Forfeiture
Illinois law establishes rigorous evidentiary rules before a landlord can retain any deposit dollars for alleged tenant damages:
The 30-Day Follow-Up Receipt Rule (765 ILCS 710/1 & RLTO § 5-12-080(d)):
If the landlord delivers an itemized statement within 30 days citing estimated repair costs, they must subsequently provide the tenant with copies of paid receipts or vendor invoices within 30 calendar days after delivering the estimate.
If repairs were performed by the landlord's own maintenance employees, the landlord must provide a detailed certification specifying the actual hours worked and materials purchased.
Automatic Forfeiture: If the lessor fails to deliver the initial itemized statement within 30 days, or fails to deliver paid receipts within 30 days of the estimate, the lessor forfeits all right to retain any portion of the security deposit under 765 ILCS 710/1.
7. Normal Wear and Tear vs Lawful Deductions in Illinois
Under 765 ILCS 710/1, deductions are prohibited for reasonable wear and tear. Deductions are valid only for tenant-caused damages beyond ordinary use, unpaid rent, or unpaid utility obligations owed under the lease:
Non-Deductible (Wear & Tear)
- • Small pin or nail holes from picture frames
- • Minor baseboard scuffs or door trim rubbing
- • Carpet traffic wear patterns from normal walking
- • Faded paint or curtains caused by sunlight exposure
- • Routine turnover cleaning between tenancies
Lawful Deductions (Actual Damage)
- • Large drywall holes or broken interior doors
- • Pet urine stains or deep carpet burns
- • Unauthorized painting in non-neutral dark colors
- • Trash, abandoned furniture, or heavy junk removal
- • Unpaid prorated or full-month rent balances
8. Statutory Penalties: 2x Deposit Damages & Attorney Fees
Illinois and Chicago provide robust financial remedies against landlords who unlawfully withhold security deposits:
Chicago RLTO Strict Liability (§ 5-12-080(f))
In Chicago, courts hold landlords strictly liable for any non-compliance under § 5-12-080. If the landlord fails to pay annual interest, commingles funds, omits the bank name on receipts, or withholds funds unlawfully, the court shall award statutory damages equal to two times the security deposit plus interest, together with court costs and reasonable attorney's fees. Bad faith is not required.
Illinois State Bad-Faith Liability (765 ILCS 710/1)
Under state law (5+ units), if the court finds that the lessor refused to provide the itemized statement or withheld deposit funds in bad faith, the lessor is liable for twice the amount of the security deposit, plus court costs and reasonable attorney's fees.
9. How to Demand Your Security Deposit Refund in Illinois
If your Illinois or Chicago landlord has missed the 30-day itemization or 45-day refund deadline, follow these steps to recover your money:
- Serve a Formal Demand Letter: Issue a written demand citing 765 ILCS 710/1 or Chicago RLTO § 5-12-080, emphasizing that failure to meet deadlines forfeits all deduction claims and triggers double-deposit statutory liability.
- File in Illinois Small Claims Court: Small Claims Court in Illinois handles disputes up to $10,000 with simplified evidentiary procedures:
- Cook County: Circuit Court of Cook County (Richard J. Daley Center or suburban district courthouses).
- Downstate Counties: Local county Circuit Court Small Claims division.
- No attorney is required, and prevailing tenants can recover reasonable attorney's fees under both 765 ILCS 710/1 and Chicago RLTO § 5-12-080(f).
- Contact Chicago Tenant Organizations: Chicago renters can contact the Metropolitan Tenants Organization (MTO) or Legal Aid Chicago for counseling and dispute mediation.
Official Illinois Statutes & Municipal Sources
- • 765 ILCS 710 — Illinois Security Deposit Return Act (buildings with 5+ units: 30-day itemization, 45-day refund, paid receipts, and 2x bad-faith damages).
- • 765 ILCS 715 — Illinois Security Deposit Interest Act (buildings with 25+ units: annual interest for deposits held > 6 months).
- • City of Chicago Security Deposit Interest Rates — Official 2026 interest rate notice (0.01%) and historical table published by the City Comptroller.
- • City of Chicago RLTO Summary — Municipal Code of Chicago Chapter 5-12, Section 5-12-080 escrow, receipt, interest, and strict liability provisions.
- • Cook County CCRTLO — Suburban Cook County Residential Tenant Landlord Ordinance (30-day return rule).
Illinois Security Deposit Return FAQ
How long does an Illinois landlord have to return a security deposit?
Under the Illinois Security Deposit Return Act (765 ILCS 710/1) for buildings with 5 or more units and the Chicago RLTO (MCC § 5-12-080), landlords must deliver an itemized damage statement within 30 calendar days if making deductions. If no damage is claimed, the full deposit must be returned within 45 calendar days after the tenant vacates. In suburban Cook County under the CCRTLO, the return deadline is 30 calendar days.
Which rental properties are covered by the Illinois Security Deposit Return Act?
The Illinois Security Deposit Return Act (765 ILCS 710/) applies statewide to residential real property containing 5 or more units. Properties with 1 to 4 units outside Chicago are exempt from this specific statute and are governed by lease contract terms and Illinois common law in Small Claims Court.
What is the Chicago security deposit interest rate for 2026?
Under the Chicago Residential Landlord and Tenant Ordinance (MCC §§ 5-12-081 and 5-12-082), the official security deposit interest rate set by the City Comptroller for January 1, 2026, through December 31, 2026, is 0.01%. Landlords must pay interest on all deposits held for more than 6 months.
Does Illinois or Chicago place a statutory cap on security deposits?
Neither Illinois state statutes nor the Chicago RLTO impose a statutory cap on security deposit amounts. Landlords standardly charge one to two months' rent, though many Chicago landlords charge a non-refundable move-in fee ($300 to $600) instead of a deposit to avoid RLTO escrow liabilities.
What receipts must an Illinois landlord provide for damage deductions?
Under 765 ILCS 710/1 and Chicago RLTO § 5-12-080(d), if an estimated repair statement is provided within 30 days of move-out, the landlord must provide paid vendor receipts or contractor invoices within 30 calendar days after delivering the estimate. Failure to provide paid receipts forfeits the deduction.
What are the penalties if an Illinois or Chicago landlord fails to return a deposit?
Under the Chicago RLTO (§ 5-12-080(f)), a landlord who fails to comply with deposit rules is strictly liable for two times the deposit amount plus interest and attorney's fees. Under Illinois state law (765 ILCS 710/1), a landlord who withholds a deposit in bad faith is liable for twice the deposit amount plus court costs and attorney's fees.
What rules apply to rental units in buildings with fewer than 5 units in Illinois?
For residential buildings with 1 to 4 units outside Chicago, the Illinois Security Deposit Return Act does not apply. In suburban Cook County, the CCRTLO covers multi-unit rentals (except owner-occupied 6 units or fewer) with a 30-day return rule. Outside Cook County, deposit disputes for small buildings are resolved under lease agreement terms in local Small Claims Court.
Legal Disclaimer
This guide and calculator provide general educational information based on the Illinois Security Deposit Return Act (765 ILCS 710/), the Chicago RLTO (MCC § 5-12-080), and the Cook County CCRTLO. They do not constitute legal advice. Landlord-tenant laws vary by local municipal charter. If you require legal representation, contact a licensed attorney or a local legal aid organization.