Illinois Security Deposit Return Deadline and Rules

Illinois regulates when a security deposit comes back and what interest it earns, but it does not cap the amount a landlord can collect at the state level. This article covers the return deadlines, the itemized-statement requirement, deposit interest, the penalties for a landlord who ignores the rules, and how Chicago’s ordinance changes the picture. It is one of the procedures covered in Illinois landlord-tenant law on deposits, leases, and tenant rights, the hub that orients the whole topic.

Is there a maximum security deposit in Illinois?

Illinois has no statewide statute limiting the size of a residential security deposit. A landlord and tenant negotiate the amount, and one or two months’ rent is a common figure. The state Security Deposit Return Act and Security Deposit Interest Act govern how the deposit is held, what interest it earns, and when it must be returned, not how much it can be.

Local ordinances can add rules, but even Chicago’s detailed ordinance does not impose a dollar cap on the deposit itself. The practical limits on deposit size come from the rental market and from the return and interest obligations that attach to whatever amount a landlord collects. Because the state law that follows applies only to buildings of a certain size, the first question for any deposit dispute is how many units the building has.

The security deposit return deadline

The core deadline sits in the Security Deposit Return Act. Under 765 ILCS 710/1, a landlord who wants to keep part of the deposit to cover property damage must furnish the tenant an itemized statement of the damage within 30 days of the date the tenant vacated the premises, or within 30 days of the date the tenant’s right of possession ends, whichever is later. The statement lists the damage and the estimated or actual cost to repair or replace each item, with paid receipts attached. If the landlord gives estimated costs, the paid receipts must follow within 30 days of the statement.

If the landlord does not send that itemized statement, the same section requires the landlord to return the full deposit within 45 days of the date the tenant vacated. The deadline can be met by personal delivery, by postmarked mail to the tenant’s last known address, or, for the statement, by email to a verified address the tenant provided. A tenant who never gives the landlord a forwarding address removes the landlord’s exposure to penalties for missing the deadline.

Interest on the deposit

A separate statute governs interest. Under 765 ILCS 715/1, a landlord of a residential building with 25 or more units, in one building or a complex on contiguous parcels, must pay interest on a deposit held for more than six months. The rate is tied to the passbook savings rate at the largest commercial bank headquartered in Illinois as of December 31 of the year before the lease began.

The payment timing is set by 765 ILCS 715/2. The landlord pays accrued interest of $5 or more within 30 days after the end of each 12-month rental period, in cash or as a credit against rent, unless the tenant is in default. All accrued interest, regardless of amount, comes due when the tenancy ends. The interest obligation is narrower than the return obligation: it starts at 25 units, while the return deadlines start at five.

Penalties when a landlord misses the deadline

The Return Act carries a specific penalty. Under 765 ILCS 710/1(c), a court that finds a landlord refused to supply the itemized statement, supplied it in bad faith, and failed to return the deposit within the time limits can hold the landlord liable for an amount equal to twice the deposit, plus court costs and reasonable attorney’s fees. That penalty is on top of returning the deposit itself.

The Interest Act has its own penalty. Under 765 ILCS 715/2, a landlord who willfully fails or refuses to pay required interest is liable for an amount equal to the deposit, together with court costs and attorney’s fees. A tenant pursuing either penalty files in circuit court; deposit disputes usually fit within small claims limits. The penalties are not automatic. A court has to find the specific conduct the statute describes, which is why documentation of the deposit amount, the move-out date, and any forwarding address given to the landlord matters in a dispute.

Chicago’s security deposit rules

Chicago’s Residential Landlord and Tenant Ordinance (RLTO) imposes stricter and broader requirements than state law for covered units. Under Chicago Municipal Code § 5-12-080, a landlord must hold the deposit in a federally insured, interest-bearing Illinois account, keep it separate from the landlord’s own funds, and disclose the financial institution in writing. The deposit must be returned, minus lawful deductions, within 45 days after the tenant moves out. If the landlord deducts for damage, an itemized statement with receipts is due within 30 days.

The RLTO covers most Chicago rentals rather than only larger buildings, so many tenants excluded from the state Act are protected by the ordinance instead. Interest under Chicago Municipal Code § 5-12-081 is set annually by the city comptroller; the published rate has been 0.01 percent for 2024, 2025, and 2026. A landlord who violates the deposit provisions of § 5-12-080 owes the tenant two times the deposit plus interest, along with attorney’s fees under the ordinance. Other Illinois municipalities, including Evanston, Urbana, and Mount Prospect, have their own ordinances with comparable 45-day return windows.

What counts as a lawful deduction

Both the state Act and the Chicago ordinance allow deductions for unpaid rent and for damage beyond normal wear and tear, not for ordinary aging of the unit. Unpaid rent is also the basis for a nonpayment eviction, and the notice a landlord must serve first is covered in Illinois eviction notices and the 5-day, 10-day, and 30-day rules. Repainting after a long tenancy or cleaning to a normal standard generally falls under wear and tear. Holes in walls, broken fixtures, and stains beyond routine cleaning are the kinds of damage the statutes contemplate.

Under 765 ILCS 710/1, a written lease can specify a fixed cost for cleaning, repair, or replacement of a named building component, and the landlord may withhold that stated amount, but the itemized statement must reference the lease provision and attach the relevant portion of the lease. When a tenant leaves early and the landlord claims unpaid rent, the deposit rules interact with the rules on ending a lease; the mechanics of an early exit are covered in breaking a lease in Illinois without penalty. A landlord who deducts amounts not tied to actual unpaid rent or documented damage risks the double-damages penalty.