Illinois Security Deposit Law 2026: Limits, Deadlines & Deductions
- How long does an Illinois landlord have to return a security deposit? 45 days after the tenant vacates — but the itemized deduction statement with receipts is due at 30 days (765 ILCS 710/1).
- Does Illinois limit how much deposit you can charge? No state cap for standard rentals (765 ILCS 710). Mobile-home tenancies are capped at one month's rent under separate law.
- Does the Illinois Security Deposit Return Act apply to small landlords? No — it applies only to residential property containing 5 or more units. Chicago's RLTO covers all covered units regardless, with stricter terms.
Illinois gives you a split clock: an itemized damage statement with paid receipts within 30 days of move-out, then the remaining balance back within 45 days. Get it wrong in bad faith and you're liable for twice the deposit plus court costs and the tenant's attorney's fees. One big caveat: the state return act only covers buildings with 5 or more units — and Chicago has its own stricter ordinance on top. Every section below is from the Security Deposit Return Act (765 ILCS 710) and the Security Deposit Interest Act (765 ILCS 715).
The short version: No state cap on the deposit (for 5+ unit buildings). Within 30 days of the tenant vacating, deliver or mail an itemized statement of damages with paid receipts; within 45 days, return the balance in person or by postmarked mail. Landlords with 25+ units holding deposits 6+ months owe interest annually. Blow the deadlines in bad faith and the court can award 2x the deposit plus fees.
The statute table
| Citation | What it says (one line) |
|---|---|
| 765 ILCS 710/0.01–710/1 | The Security Deposit Return Act applies to lessors of residential real property containing 5 or more units. |
| 765 ILCS 710/1 | No state cap on the deposit amount. |
| 765 ILCS 710/1(a) | Within 30 days of the tenant vacating, furnish an itemized statement of the damage and the estimated or actual cost of each repair, attaching paid receipts (or copies); the landlord's own labor may be billed at reasonable cost. |
| 765 ILCS 710/1(a) | If only estimated costs were given, deliver the paid receipts within 30 days of the itemized statement. |
| 765 ILCS 710/1(a) | No statement or receipts within 30 days = return the full deposit within 45 days of the tenant vacating, in person or by postmarked mail to the last known (or tenant-provided) address. |
| 765 ILCS 710/1(b) | No statement is required if the deposit is withheld solely for unpaid rent rather than property damage. |
| 765 ILCS 710/1 | If the tenant never provides a mailing or email address, the lessor is not liable for damages or penalties from that failure. |
| 765 ILCS 710/1(c) | Refusing the itemized statement, supplying it in bad faith, and missing the return deadline = liable for 2x the deposit due + court costs + reasonable attorney's fees. |
| 765 ILCS 715/1–715/2 | Landlords with 25 or more units holding a deposit 6+ months must pay interest every 12 months at the rate paid on savings accounts at the state's largest commercial bank as of Dec. 31 before the tenancy began. |
Limits: how much can you charge?
No state maximum for standard residential rentals. (The one exception lives outside these acts: mobile-home tenancies are capped at one month's rent.) The 5-unit threshold matters more than the cap: if your building has fewer than 5 units, 765 ILCS 710's statement-and-deadline machinery doesn't bind you — but Chicago's ordinance or your lease terms may impose their own. Sanity-check your amount with the Security Deposit Max Checker.
The 30-day and 45-day deadlines, precisely
Illinois runs two clocks, and the first one is the killer:
1. 30 days from the date the tenant vacated — deliver (in person, by postmarked mail, or by email to a verified address the tenant provided) the itemized statement of damages with estimated or actual repair costs plus paid receipts (710/1(a)).
2. 45 days from the date the tenant vacated — return the remaining deposit balance (in person or by postmarked mail).
If you can't produce the receipts (repairs not yet done), the itemized statement with estimates still goes out at 30 days, and the paid receipts follow within 30 days of the statement. Miss the 30-day statement entirely and you owe the full deposit back by day 45. Skip the 45-day return too, and you're in 710/1(c) penalty territory. Track both dates with the Security Deposit Deadline Finder.
Special case: if you're withholding only for unpaid rent and not for property damage, no itemized statement is required at all (710/1(b)). Send one anyway — judges reward paper trails.
When the clocks actually start
Both clocks run from the date the tenant vacated the unit — not from the lease end date on paper, not from your walk-through, and not from when cleaning finishes. A tenant who surrendered keys and removed their belongings on the 2nd starts the clock on the 2nd even if the lease nominally ran to the 5th; a tenant who holds over keeps the clock from starting until they are actually out. The 30-day statement and the 45-day return are measured from that same vacate date, so the statement is not due 30 days before the refund by accident — the gap is deliberate: Illinois wants the tenant to see the itemized charges, with receipts, before the balance is final. Log three dates in the deposit file on move-out day: the vacate date, the date the statement was delivered or postmarked, and the date the balance was delivered or postmarked. In a penalty dispute those three postmarks are the whole case.
A worked example
Say a tenant in a 6-unit building renting for $1,800 a month vacates on Monday, March 2, 2026, leaving a $1,800 deposit. Your itemized statement of damages, with paid receipts or copies, is due within 30 days: Wednesday, April 1, 2026. The balance is due within 45 days: Thursday, April 16, 2026. Suppose the file supports $450 of tenant-caused damage beyond normal wear and tear and $200 of cleaning the lease prices explicitly — $650 in total. The statement delivered by April 1 lists each item with its estimated or actual cost and attaches the paid receipts; the $1,150 balance then goes out in person or by postmarked mail by April 16. If repairs are not finished by April 1, the statement still goes out on time with good-faith estimates, and the paid receipts follow within 30 days of the statement — by Friday, May 1, 2026. What you cannot do is hold the statement hostage to the repairs: a perfect statement delivered on day 35 is still a missed 30-day deadline, and missing the statement entirely converts the obligation into a full $1,800 refund due by day 45.
Never miss Illinois' two-clock system: the Security Deposit Disposition & Deadline Tracker ($14.95) tracks per-unit deductions, itemization status, and both deadlines — the 30-day itemized statement and the 45-day refund — so the clock never lapses.
Deductions and the itemized list
Allowable deductions: unpaid rent, unpaid utilities, physical damage beyond normal wear and tear, costs from lease breaches, and charges spelled out in the lease. If your written lease specifies a dollar amount for cleaning, repair, or replacement of a building component, you may withhold that exact amount — just reference the lease section and attach a copy of it (710/1(a)).
The statement itself must list each damaged item with its estimated or actual cost, attach paid receipts or copies, and may include the reasonable cost of your own labor. Produce the compliant paperwork with the Security Deposit Deduction Letter Generator.
Move-out compliance checklist
1. Confirm the Return Act even applies. Count the units in the property: at 5 or more, 765 ILCS 710 binds you; below 5, check whether Chicago's ordinance or your own lease imposes equivalent duties before assuming none apply.
2. Fix the vacate date on day one. Record the date the tenant actually vacated and get a forwarding mailing or email address in writing — a missing address is your safe harbor, but only if you asked.
3. Calendar both clocks immediately. Day 30 for the itemized statement with receipts, day 45 for the balance. Calendar backwards from day 30, not forwards from when repairs finish.
4. Inspect and document in the first days. Photograph every claimed item and tie each charge to damage beyond normal wear and tear, an unpaid amount, or a dollar figure your lease itself specifies.
5. Attach paid receipts, or use the estimate bridge correctly. Receipts or copies travel with the statement; if only estimates are ready, deliver the statement on time anyway and send the paid receipts within 30 days of the statement.
6. Deliver provably. Hand-deliver, postmarked mail, or email to a verified address the tenant provided — and keep the postmark or delivery record with the deposit file.
7. Close by day 45 even when the file is messy. Return the undisputed balance on time; a partial, documented, on-time return is defensible, while a full refund withheld past day 45 in bad faith is what triggers the double-damages penalty.
Interest and where the money sits
No separate account required. Interest is required, but only at scale: landlords leasing 25 or more units who hold a deposit for 6 months or longer must pay interest credited or paid to the tenant every 12 months, at the rate paid by savings accounts at the largest commercial bank in the state as of December 31 before the tenancy began (765 ILCS 715/1–715/2). Under 25 units? No interest owed. Compute what you owe with the Security Deposit Interest Calculator.
Chicago warning: the Chicago Residential Landlord and Tenant Ordinance is stricter than state law (its own interest rate set annually by the City Comptroller, receipt requirements, 2x penalty). If you own in Chicago, the ordinance — not this page — is your rulebook.
The penalty, spelled out
Under 765 ILCS 710/1(c), when a circuit court finds the lessor refused the itemized statement, supplied it in bad faith, and failed to return the deposit due within the time limits, the lessor is liable for:
- twice the amount of the security deposit due,
- court costs, and
- the tenant's reasonable attorney's fees.
Safe harbors: no liability if the tenant never gave you a mailing or email address to send anything to — so always ask for a forwarding address in writing at move-out.
Run the worked example through that sanction: on the $1,800 deposit above, if the full $1,800 was due and a court found a bad-faith refusal plus a missed deadline, the award is twice the deposit due — $3,600 — plus court costs and the tenant's reasonable attorney's fees, on top of returning the deposit itself. Note what the multiplier measures: the deposit due, not just the $650 you argued about. That is why the cheap move in Illinois is always procedural — an on-time statement with receipts and an on-time balance cost nothing extra, and they are the entire defense if the tenant later claims bad faith.
FAQ
How long does an Illinois landlord have to return a security deposit?
45 days after the tenant vacates — but the itemized deduction statement with receipts is due at 30 days (765 ILCS 710/1).
Does Illinois limit how much deposit you can charge?
No state cap for standard rentals (765 ILCS 710). Mobile-home tenancies are capped at one month's rent under separate law.
Does the Illinois Security Deposit Return Act apply to small landlords?
No — it applies only to residential property containing 5 or more units. Chicago's RLTO covers all covered units regardless, with stricter terms.
When must Illinois landlords pay interest on deposits?
Landlords with 25+ units holding a deposit 6+ months pay interest every 12 months at the largest commercial bank's savings rate as of the prior Dec. 31 (765 ILCS 715).
What if the landlord only withholds for unpaid rent?
No itemized statement is required when the deposit is withheld solely for unpaid rent rather than property damage (765 ILCS 710/1(b)).
What is the penalty for violating Illinois deposit law?
Twice the deposit due, plus court costs and the tenant's reasonable attorney's fees (765 ILCS 710/1(c)).
What happens if repairs are not finished within 30 days?
The itemized statement still goes out by day 30 with estimated costs; the paid receipts then follow within 30 days of the statement (765 ILCS 710/1(a)).
Does Chicago follow the same Illinois deposit rules?
No. Chicago's Residential Landlord and Tenant Ordinance adds its own receipt, interest, and penalty rules on top of state law and is stricter; Chicago landlords should follow the ordinance.
Read the statute yourself
Everything on this page traces back to the Security Deposit Return Act (765 ILCS 710) and the Security Deposit Interest Act (765 ILCS 715). If a deadline, deduction, or penalty question is ever disputed, the primary sources — not a summary — are what control:
- Security Deposit Return Act, 765 ILCS 710 (Justia) — full text of the act covering the 5-unit threshold, the 30-day itemization rule, the 45-day return, and the double-damages penalty.
- Security Deposit Interest Act, 765 ILCS 715 (Justia) — full text of the act covering interest for landlords with 25 or more units holding a deposit 6 months or longer.
- 765 ILCS 710/1 (Cornell Law Institute) — a readable version of the core return-and-itemization section, useful for cross-checking the full text.
More security deposit guides
- Security deposit laws by state
- Idaho security deposit law
- Indiana security deposit law
- Hawaii security deposit law
- Iowa security deposit law
Last verified: October 15, 2026. This is general information, not legal advice. Verify with a licensed Illinois attorney before acting.