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Author: Mark Ainely | Partner GC Realty & Development & Co-Host Straight Up Chicago Investor Podcast
The security deposit is the smallest number in your lease and the one most likely to land you in court. I have been managing rentals in Chicagoland since 2003, and our team at GC Realty now oversees roughly 1,500 units across more than 100 municipalities. The pattern never changes. Owners rarely get sued over rent. They get sued over a $1,200 deposit they held a week too long or a paint charge they could not back up with a receipt.
Illinois makes this harder than it needs to be. There is no single statewide rulebook. A state act sets the baseline, then Chicago, Cook County, and a handful of suburbs layer their own rules on top, each with different caps, deadlines, and interest requirements. The penalty for getting it wrong is usually two times the deposit plus the tenant's attorney fees, which turns a small mistake into a real check.
This guide walks through how much you can collect, where it has to sit, when it has to go back, what you can legally deduct, and how our team decides what to charge at move out.
Key Takeaways
Illinois has no statewide cap on security deposits. Suburban Cook County caps them at 1.5 times monthly rent, and Chicago has no cap, although most Chicago landlords use a non refundable move in fee instead of a deposit.
Since January 1, 2024, the state Security Deposit Return Act applies to every residential landlord in Illinois, not just buildings with five or more units.
To keep any part of a deposit for damage, you must send an itemized statement with receipts or estimates within 30 days. If you skip it, the full deposit is due back within 45 days.
Chicago landlords must return deposits within 45 days, hold them in a federally insured Illinois account, give a signed receipt, and pay interest every year. Suburban Cook County landlords have 30 days.
You can only deduct unpaid rent and tenant caused damage beyond ordinary wear and tear, priced at actual cost.
The usual penalty for getting it wrong is two times the deposit plus the tenant's attorney fees.
Which Rules Apply to Your Property
Your address decides your rulebook. Every Illinois rental falls under the state Security Deposit Return Act, and then you stack the local ordinance on top. When two rules cover the same issue, follow the one that is tougher on you as the landlord.
Illinois Security Deposit Return Act. Applies to every residential rental in the state. There is no cap. You must send an itemized statement within 30 days or return the full deposit within 45 days. Interest is only required for buildings or complexes with 25 or more units. The penalty is two times the deposit due plus court costs and attorney fees.
Chicago RLTO. Applies to most Chicago rentals, except owner occupied buildings with six or fewer units. There is no cap. The deposit is due back within 45 days, with itemized damages within 30 days. Interest is owed every year on every covered deposit held more than six months. The penalty is two times the deposit plus interest and attorney fees.
Cook County RTLO. Applies to most of suburban Cook County. Deposits are capped at 1.5 times monthly rent. The refund and itemized deductions are due within 30 days. The county does not require interest. The penalty is two times the deposit plus attorney fees.
Collar counties (DuPage, Kane, Lake, Will, McHenry). There is no county ordinance, so state rules apply. No cap, and interest only for 25+ unit properties.
A few details matter here. The Cook County RTLO exempts owner occupied buildings with six or fewer units, plus a single family home or condo when the owner rents only that one property and the owner or an immediate family member lived there in the past 12 months. Evanston, Oak Park, and Mount Prospect run their own landlord tenant ordinances with their own deposit rules, and in some cases the deadlines are tighter than the county's. If you own in one of those towns, read the local code before you collect a dollar.
The biggest change most owners missed came in 2024. The state act used to cover only buildings with five or more units, so plenty of single family and two flat owners outside Cook County assumed it did not apply to them. A 2023 amendment removed that limit, effective January 1, 2024. Today the 30 day itemization rule applies to a single family rental in Naperville the same as a 50 unit building in Rogers Park.
How Much Can You Charge for a Security Deposit in Illinois?
Outside suburban Cook County and a few home rule towns, Illinois law sets no maximum. Most of the market lands at one month's rent, and that is where we recommend owners stay. A bigger deposit shrinks your applicant pool and does not protect you as much as you think, because you can only keep what you can document.
In suburban Cook County, the RTLO caps the deposit at 1.5 times monthly rent. On a $2,000 rental that means $3,000 is the ceiling, and collecting $3,001 is itself a violation that exposes you to the two times penalty.
In Chicago there is no cap on the deposit amount. The catch is everything that comes with it. The RLTO's receipt, bank account, interest, and return rules are some of the strictest in the country, and a single technical miss can cost you two times the deposit plus the tenant's attorney fees. Because of that, most Chicago landlords skip the security deposit entirely and collect a non refundable move in fee instead.
Security Deposit or Non Refundable Move In Fee?
Tenants in the city now expect a non refundable move in fee, and that is what we collect on most of our Chicago units. We covered this in detail in Security Deposits vs. Move In Fees in Chicago Rentals, but here is the short version.
It is not tenant money held in trust. No separate account, no annual interest, no 45 day return, and no itemized statement at move out.
Keep it under 50% of one month's rent. At 50% or more, it gets treated as a security deposit no matter what your lease calls it. Most landlords land between 25% and 35%. On a $2,000 unit, a 30% fee is $600, compared with a $2,000 deposit, and that lower hurdle helps you fill vacancies faster.
Pick one, not both. Collecting a move in fee and a deposit on the same lease drags you right back into RLTO deposit compliance.
Label it clearly. The lease should state that the fee is non refundable, the exact amount, and when it is due. Starting January 1, 2027, HB 3564 also requires fees like this to be disclosed on the first page of the lease and in the listing.
Know the tradeoff. A move in fee does not secure future damage or unpaid rent. Strong screening, renters insurance, and well documented move out charges carry more of the load.
Outside Chicago, we still collect a standard security deposit, usually one month's rent. In suburban Cook County, move in fees are allowed only when they are reasonably related to your actual move in costs, and you cannot get around the 1.5x cap by relabeling a deposit as a fee.
Receipts, Bank Accounts, and Interest
In our experience, a lot of Chicago deposit claims are not about damage at all. They are about paperwork that was wrong on day one.
In Chicago, the RLTO requires a signed receipt that names the owner, the date, and the unit. The deposit has to sit in a federally insured, interest bearing account at an Illinois bank, separate from your own money, and you must tell the tenant in writing which bank holds it. You also owe interest every year on deposits held more than six months, paid in cash or as a rent credit within about 30 days after each 12 month period. The City Comptroller set the 2026 rate at 0.01%, and the interest rate summary has to be attached to every Chicago lease that takes a deposit. On a $2,000 deposit the interest is about 20 cents a year. Nobody sues over 20 cents. They sue because a missed 20 cent payment triggers a penalty of two times the deposit.
In suburban Cook County, the RTLO requires a receipt, a separate account at an Illinois financial institution, and written notice of the bank's name. If you move the money to a new bank, you have to tell the tenant. The county gives landlords a two business day right to cure administrative mistakes like a missing bank disclosure, but only after the tenant points it out.
Everywhere else in Illinois, state law does not require a separate account. The Security Deposit Interest Act only kicks in for a single building or complex with 25 or more units, on deposits held longer than six months. The 2026 state rate is 0.005%. We still recommend a dedicated trust account for every deposit. Commingled money is the fastest way to lose an argument with a judge.
When Do You Have to Return a Security Deposit in Illinois?
The clock starts the day the tenant moves out or the day their right to possession ends, whichever is later. From there, three deadlines matter.
Day 30 is the itemization deadline everywhere. If you plan to keep any money for damage, the tenant needs an itemized statement listing each item and its repair cost, with paid receipts or written estimates attached. State law lets you deliver it in person, by postmarked mail, or by email to a verified address the tenant gave you.
Day 30 is also the full return deadline in suburban Cook County. The refund and the itemized deductions go out together.
Day 45 is the outside limit statewide and in Chicago. If you never sent a proper itemized statement, the whole deposit is due back by day 45. In Chicago, the balance plus any interest owed is due within 45 days either way. If a fire forced the tenant out of a Chicago unit, you have just 7 days.
If you sent estimates instead of receipts, you owe the tenant paid receipts within 30 days after the estimate went out. If you did the work yourself, you can bill the reasonable cost of your own labor. And if you truly cannot produce a receipt through no fault of your own, the state act lets you substitute an itemized cost list, any other evidence you have, and a verified statement explaining why the receipt is missing.
One practical tip. Get a forwarding mailing address or email in writing before the keys come back. Under the state act, a landlord is not liable for damages or penalties when the tenant never provided an address. That protection only helps if you can prove you asked.
What You Can and Cannot Deduct
You can deduct two things, unpaid rent and tenant caused damage beyond ordinary wear and tear. Everything else belongs to the owner. The charge has to reflect what the repair actually cost, not a round number that feels fair.
Usually deductible
Unpaid rent and unpaid utilities owed under the lease
Large holes, TV mount anchor holes, and clusters of holes
Crayon, marker, or unauthorized paint colors
Burns, pet urine, chewed trim, and deep carpet stains
Broken glass, blinds, or fixtures not noted at move in
Furniture, trash, and belongings left behind
Excessive cleaning, like a grease caked oven or food left in the fridge
Usually not deductible
Faded or dull paint, light scuffs, and a few small picture nail holes
Carpet worn down in walkways from normal foot traffic
Routine turnover cleaning between residents
Rekeying locks for the next tenant
Anything already damaged at move in
Code upgrades like GFCI outlets or smoke and CO alarms
Items already past their useful life
The gray area is where owners get hurt. Paint, carpet, and cleaning cause most disputes, and the answer usually depends on two facts. How long did the tenant live there, and what did the unit look like on move in day? A wall that needed repainting after a four year tenancy was going to be repainted anyway. A carpet that was already seven years old has no remaining value to charge against.
A well written lease can help at the margins. Since 2024, the state act lets a lease list specific dollar amounts for cleaning, repair, or replacement of components that will not be replaced if damaged, as long as those amounts are reasonable and tied to damage beyond normal wear. Your itemized statement must reference that lease amount and include a copy of the lease section. A lease can add obligations, but it can never waive protections the statute or a local ordinance gives the tenant.
How We Handle Move Out Deductions at GC Realty
We process hundreds of move outs a year, so we built a written chargeback standard and every assessment runs through it. The guiding rule is simple. The cost of under charging is small. The cost of over charging is large. Our job is to produce the most defensible number, not the highest one.
Here is how that plays out.
The law goes first, the lease second, our policy last. Every line on the turnover invoice is tested against the statute and local ordinance before anything else. If the law says no, the lease cannot rescue it. Our internal policy can only narrow what the law and lease allow, never expand it.
Two move in inspections set the baseline. Our tech completes a quality control inspection after the turnover is finished and before the resident takes possession. The resident also gets their own move in inspection to flag anything they want on record. If either document notes a problem, it is pre-existing and we do not charge for it.
Our own inspector's words count against us. If the move out report describes something as worn, aged, faded, or scuffed, that is an admission of wear and tear. We move it to the owner's side of the ledger. A tenant's attorney would read it the same way.
We depreciate items with a useful life. Our internal standard treats paint and carpet as having a three year (36 month) life and caulk and grout as two years. Those windows are tighter than many benchmarks on purpose. The formula is the repair cost multiplied by the months of life remaining, divided by the total life.
A quick example shows how it works. A tenant leaves after 18 months with two TV mount anchor holes in a bedroom. The vendor bills $100 for the drywall patch and $200 to repaint the room.
The drywall patch is an additive repair that would not exist without the damage, so we charge the full $100.
The paint has 18 of its 36 months left, so the charge is $200 times 18 divided by 36, or $100.
The tenant's total is $200, not $300, and every dollar ties back to a photo, a line item, and a formula.
We itemize, we never allocate. Cleaning charges are tied to specific items on the move out report at reasonable per item costs, like $25 to $35 for a medicine cabinet interior or $40 to $60 for a washer lint trap. We do not take a percentage of a cleaning invoice and call it damage. Normal turnover cleaning is an owner expense in our book.
Some charges we never pass through. Lock changes, our own inspection walks, routine caulking after two years, and anything code related stay with the owner. That includes smoke and CO detector batteries. Illinois now requires sealed 10 year battery alarms or hardwired units, so a unit that needs a battery swap has a non compliant device and the upgrade is the owner's cost.
Owners sometimes push back on this. Our answer is that the assessment gets mailed to the tenant, and some tenants will take it to a lawyer. We would rather send a $600 statement that holds up than an $1,100 statement that turns into a $4,000 judgment.
What Happens When Landlords Get It Wrong
The penalties are built to make small mistakes expensive.
State law. If a court finds you refused to send the itemized statement, or sent it in bad faith, and failed to return what was owed on time, you owe two times the deposit due plus court costs and the tenant's attorney fees.
Chicago RLTO. Violating the deposit rules, including technical ones like a missing receipt, the wrong interest, or no bank disclosure, exposes you to two times the deposit plus interest and attorney fees. Unlike the state act, the ordinance does not require a finding of bad faith.
Cook County RTLO. Charging over the cap, failing to return the deposit, or failing to show proof of repair costs exposes you to two times the deposit plus attorney fees.
Interest Act. Willfully failing to pay required interest on a 25+ unit property costs an amount equal to the full deposit plus attorney fees.
The attorney fees are what hurt. A tenant's lawyer can bill far more than the deposit, and you pay it if you lose. In a 2025 Illinois appellate decision summarized by Illinois REALTORS, a Chicago landlord was ordered to pay $75,000 for mishandling a security deposit under the RLTO. The landlord was the one who filed suit, chasing unpaid rent.
If you are buying an occupied building, this matters before closing too. Under the state act, the buyer becomes liable for the tenants' existing deposits, including statutory interest, and the seller stays jointly liable. Get a certified deposit ledger from the seller and make sure the money actually transfers.
This article is general information, not legal advice. For a specific dispute, talk to an Illinois landlord tenant attorney.
Frequently Asked Questions
Is there a limit on security deposits in Illinois?
Not at the state level. Suburban Cook County caps deposits at 1.5 times monthly rent, and some home rule towns set their own limits. Chicago has no cap, but most Chicago landlords collect a non refundable move in fee instead of a deposit.
How long does a landlord have to return a security deposit in Illinois?
Under state law, you have 30 days to send an itemized statement if you are keeping anything, and 45 days to return the full deposit if you are not. Chicago allows 45 days. Suburban Cook County requires the refund and itemization within 30 days.
Can a tenant use the security deposit as last month's rent?
Only if you both agree in writing. A deposit secures performance of the whole lease. Many leases, including ours, say the deposit cannot be applied to last month's rent.
Do I have to pay interest on a security deposit in Illinois?
In Chicago, yes, on every RLTO covered deposit held more than six months. Outside Chicago, state law requires interest only for buildings or complexes with 25 or more units. Some suburbs, including Evanston, have their own interest rules.
Can I charge a tenant for cleaning?
You can charge for cleaning that goes beyond normal use, such as grease buildup, pet waste, or trash left behind, as long as each item is documented and priced at actual cost. A standard between tenant clean is an owner expense.
What if the tenant does not leave a forwarding address?
The state act says a landlord is not liable for damages or penalties when the tenant fails to provide a mailing or email address. Ask for one in writing at move out and keep a record that you did.
Does the new Illinois junk fee law change security deposits?
Based on the enacted version of HB 3564, which takes effect January 1, 2027, the law does not cap security deposits or ban move in fees. It does regulate other fees, so review your full fee schedule before your 2027 leases go out.
Should I charge a security deposit or a non refundable move in fee in Chicago?
For most Chicago rentals, we use a non refundable move in fee. It keeps you out of the RLTO's deposit rules as long as it stays under 50% of one month's rent and you do not also collect a deposit. Outside the city, a standard deposit of about one month's rent is still the norm.
Don't Go At This Alone!
Security deposits look simple until you are standing in a vacant unit with a turnover invoice, two inspection reports, and a 30 day clock running. Who's on your investing team? Do you even have a team? GC Realty & Development, LLC has a dedicated team of professionals with decades of experience across all facets of real estate investment. We handle everything from brokerage to leasing and property management across roughly 1,500 units, and every move out runs through the same written chargeback process described above. Whether you hire us or not, we're happy to provide our resources and expertise.
What gets me up in the morning and keeps me going for 12 hours a day is the ability to add value for local area investors in Chicago and beyond! Those who connect with me often hear me say that our goal is to bring value to everyone we come in contact with.
In return, they will one day hire us for our tenant placement or property management services, refer us to someone they know, or leave a review about our services. We would clearly love all three; however, we're happy whenever we get the opportunity to help!
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