Security Deposit Demand Letters
Illinois · 765 ILCS 710/1 (Security Deposit Return Act)

The Illinois security deposit demand letter that gets deposits back.

Need an Illinois security deposit demand letter? Your landlord had to act with the itemized statement due within 30 days and the refund within 45 days of termination (properties of 5 or more units). Miss that, and 765 ILCS 710/1 (Security Deposit Return Act) is written on your side.

Make them answer for it
Free to write and read your Illinois letter. $20 only when you send it.
45
days to return or itemize
2×
potential damages on wrongful withholding
$20
letter + certified mail, one-time

Last updated September 2026 · statute source checked August 29, 2026

Statute · Illinois
765 ILCS 710/1 (Security Deposit Return Act)
Itemized deduction statement required. Read 765 ILCS 710/1 (Security Deposit Return Act) on the official state site →
Verified 2026-08-29

How we build this letter → Statute checked against 765 ILCS 710/1 (Security Deposit Return Act) on the state's own site. We do not publish figures we cannot read at the source.

Worked example

What that means in dollars

On a $1,500 deposit wrongfully withheld in full, Illinois law allows pursuing up to $3,000, plus attorney’s fees where the statute allows. Most landlords understand this math, which is why a letter citing 765 ILCS 710/1 (Security Deposit Return Act) is often enough to get a check without going to court.

Calculate your own numbers →

Worked example · $1,500 deposit
Statutory 2× on withheld amount$3,000
Attorney's fees where allowed+ fees
Potential total demand$3,000

Statutory ceiling. Courts decide actual awards.

What actually goes in the mail

You approve the wording first. Then it prints, goes out certified with return receipt requested, and comes back to you as a tracking number, a delivery record, and a signed PDF whose fingerprint proves the text never moved.

How it works covers every step, and what it costs to do the same thing alone.

Have it mailed, not downloaded.$20 covers the letter, the printing, the certified postage, and the return receipt — and you read every word before you pay.
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On the last page of your letter

The bit that stops them arguing

Not a logo that says “verified.” A short record of how and when you signed, printed on the letter your Illinois landlord is holding, plus a code made from the letter's own words.

  • The demand paragraph
  • The signature record
  • The SHA-256 hash
  • Certified Mail with Return Receipt
Pin 1 · The demand paragraphThe paragraph names your state's statute, the amount your landlord kept, the deadline they missed, and gives them a firm deadline to send the money before the letter says what happens next. Every part of it comes from the answers you gave, printed in the order the law expects.
Pin 2 · The signature recordMethod (drawn or typed), date, time zone, IP, browser, and consent to sign electronically. Printed on the letter itself, so the person receiving it can see how it was signed. Nothing goes out until a real person signs.
Pin 3 · The SHA-256 hashA 64-character code built from every word in your letter, recorded with the date and time you signed. It is your signing record: paste it into the checker at /verify/ and it confirms the wording you hold is the wording you signed, unchanged. It is not proof of delivery; the certified mail record below is.
Pin 4 · Certified Mail with Return ReceiptSomeone at the other end has to sign. This is the proof: the certified mail receipt, the USPS tracking history, and the delivery signature with its date. The Postal Service records them, our mail partner passes them to us, and we email them to you and post them on your letter tracker. Your landlord cannot claim the letter never came.

The closing words above are the real ones our engine writes for Illinois letters, statute and deadline included. The name, signature and codes are made up; yours carry your own record. The time is shown in the signer's own time zone, not ours.

That code is built from every word in your letter. Change one word and it no longer matches. Type it into our checker and it tells you the letter is the same one you signed. Try the checker on this Illinois example →

How your Illinois letter works

The short version, in three steps

01

Answer a few questions

Your deposit, dates, landlord's address, and what happened. About 5 minutes.
02

See your exact letter

A formal demand citing 765 ILCS 710/1 (Security Deposit Return Act) and the deadline your landlord missed, reviewed by you before anything mails.
03

We mail it certified

USPS Certified Mail with Return Receipt. Somebody has to sign for it, and you get a copy of that signature. That is your proof of delivery if this ends up in small claims court.
Skip the trip to the Post Office.$20 covers the letter, the printing, the certified postage and the return receipt. No stamps, no green card to fill in wrong, no queue.
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How the Illinois clock actually runs

Deadlines in deposit law are unforgiving in one direction and vague in the other, so it is worth being exact about how this one runs.

In Illinois the window is 45 days. In full: 30 days to itemize; 45 days to refund (properties of 5+ units). Read that phrasing twice: it is doing real work.

  • It is not one flat number. The window changes depending on what happened at the end of your tenancy, so the honest answer to “how long do they have?” depends on facts only you know. Work out which branch you are in before you accuse anyone of being late.
  • Measure from possession, not from the lease end date. Leases end on paper; tenancies end when the keys change hands. Where those are different days, it is usually the second one that matters.
  • Do not treat the deadline as your own cut-off. It sets when the landlord was supposed to act. Your own time to pursue it runs much longer, though your evidence quietly decays throughout, which is the real reason not to wait.

The Illinois detail most renters never find

One Illinois wrinkle is worth knowing before you send anything:

Chicago's RLTO imposes stricter rules and higher penalties inside the city (interest, 2x + fees).765 ILCS 710/1 (Security Deposit Return Act) · general legal information, not legal advice

It is the sort of detail that never comes up until it is used against you. Better to have accounted for it in the letter than to meet it for the first time in a reply.

What you can actually ask for in Illinois

Most renters ask for their deposit back and stop there. Illinois law generally has more to say about a landlord who gets this wrong.

Bad faith violations can make the landlord liable for twice the deposit plus attorney's fees and costs.765 ILCS 710/1 (Security Deposit Return Act) · general legal information, not legal advice

That multiple is the mechanism that makes ignoring a letter expensive. A landlord deciding whether to bother replying is not choosing between “pay now” and “pay later.” They are setting it against a number several times larger, set by someone else. Your letter’s job is to make that arithmetic visible and specific.

Illinois also sits in the minority of states where a deposit is not simply held: interest forms part of what is owed. Renters almost never raise it and landlords almost never offer it, so it is quietly one of the sums renters most reliably never ask for. Over a tenancy of several years it stops being trivial.

Courts decide actual awards, and statutes carry conditions and exceptions. What the statute names is the most a judge may award on the right facts, never a promise about your letter.

Have it mailed, not downloaded.$20 covers the letter, the printing, the certified postage, and the return receipt — and you read every word before you pay.
Read my Illinois letter

What to do first

None of this needs a lawyer and all of it fits in one evening. It is also the difference between a demand that gets waved away and one a landlord’s insurer tells them to pay.

  1. Establish exactly when you gave the place back. Renters routinely misremember this by a week, and a week is sometimes the whole argument. Look for a dated text to the landlord, a moving truck receipt, a final utility reading: anything from that day.
  2. Locate the moment you handed over a forwarding address. This is the single most exploited weakness in deposit disputes, and it is entirely fixable in advance, but only if you know whether you have the proof or not.
  3. Treat their deduction list as an asset, not an insult. The weaker it is, the better it is for you. Unsupported line items are exactly what a judge asks a landlord to justify, and they usually can't.
  4. Rescue your moving day photographs from your phone. The original files carry the date inside them, which is what makes them worth anything. Copies of copies lose that, and phones are not archives.
  5. Never let a partial payment pass in silence. If a check turns up for less than you are owed, deposit it if you need to, but send a line saying you treat it as partial. Silence after a partial payment is the easiest thing in the world to recast later as agreement.

What is typically at stake in Illinois

It helps to know what is typically at stake here, because the amounts explain the behavior on both sides. Median gross rent in Illinois runs about $1,274 a month, and roughly 33% of households, some 1,657,539 of them, rent rather than own (ACS 2024 5-year). Where a deposit is set around a month’s rent, a typical Illinois deposit lands near $1,274.

Hold those two facts together and the behavior makes sense. For you it is next month’s rent; for a landlord with a portfolio it is an administrative annoyance worth postponing indefinitely. Nothing changes until the postponing starts costing them something.

Where an Illinois deposit case goes if the letter does not work

You are unlikely to need this. It is worth knowing anyway, because a specific letter reads very differently from a vague one.

In Illinois that is the Small Claims Court (Circuit Court). At $10,000, the court's limit sits well clear of a typical Illinois deposit, so for most renters it is not the constraint. Proving the number is.

This forum is built for people without lawyers: simplified filing, relaxed evidence rules, and judges used to hearing renters directly. You normally file where the property is or where the landlord can be found, pay a filing fee that is a small fraction of the claim, and arrange formal service. Filing fees, service rules and local procedure are set by the court rather than by us. The Illinois judiciary publishes its own small claims instructions and forms, and that is the page to read before you file.

Judges in this forum decide quickly and on documents. The renter who arrives with a dated demand and a signed USPS delivery record is in a materially different position from the one describing a series of phone calls.

Read the whole letter first.Reading your Illinois letter costs nothing. You decide after you have seen it.
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Illinois by the numbers

How Illinois compares to the other 50

2×
damages allowed. Among the 32 of 51 jurisdictions with multiplied damages
45 days
to act. Only 37 states give landlords less time
$2,600
potential statutory exposure on a typical $1,300 deposit, about one month's median rent here
$10,000
Small Claims Court (Circuit Court) limit. Deposit claims fit easily, and no lawyer is required

Median gross rent in Illinois runs $1,274 a month, and ≈1.7 million households here rent rather than own, 33% of every household in the state. All of them are on the same 45-day clock you are.

Sources: U.S. Census Bureau, ACS 2024 5-year, tables B25064 & B25003; 765 ILCS 710/1 (Security Deposit Return Act). Comparisons computed across all 50 states + DC from our source-checked statute dataset. Statutory figures are ceilings, and courts decide actual awards.

Illinois landlords owe interest on your deposit

765 ILCS 715/1 (Security Deposit Interest Act)

Interest each year at the rate the state's largest bank pays on a basic savings account, a figure that changes annually.

Applies when: Buildings of 25 or more units, where the deposit is held more than six months. Chicago's RLTO imposes its own, broader rule.

See what your deposit interest is worth → · your letter demands it automatically.

Illinois deposit questions

Illinois deposit questions, answered

How long does a landlord have to return a security deposit in Illinois?
Under 765 ILCS 710/1 (Security Deposit Return Act), the landlord generally must act with the itemized statement due within 30 days and the refund within 45 days of termination (properties of 5 or more units). If the landlord keeps any portion, an itemized written statement of deductions is required. This is general legal information. The statute contains conditions and exceptions.
What happens if my landlord misses the Illinois deadline?
Bad faith violations can make the landlord liable for twice the deposit plus attorney's fees and costs. A written demand letter that cites 765 ILCS 710/1 (Security Deposit Return Act) puts the landlord on notice that you know the rules they broke and what the statute allows you to pursue.
How do I write a security deposit demand letter in Illinois?
A security deposit demand letter for Illinois needs five things. Your tenancy facts (address, move out date, deposit amount), the statute citation (765 ILCS 710/1 (Security Deposit Return Act)), the deadline the landlord missed, the remedies the statute allows, and a clear payment demand with your forwarding address. Our free annotated Illinois sample letter shows the full structure. Or answer a few questions and we generate yours with your facts and mail it certified.
Does my landlord owe me interest on my security deposit in Illinois?
Yes. Illinois requires it under 765 ILCS 715/1 (Security Deposit Interest Act): Interest each year at the rate the state's largest bank pays on a basic savings account, a figure that changes annually. Buildings of 25 or more units, where the deposit is held more than six months. Chicago's RLTO imposes its own, broader rule. Renters almost never ask, which is exactly why landlords almost never pay. Our demand letter cites that provision and demands accrued interest along with the deposit itself.
Do I need a lawyer to send a demand letter in Illinois?
No. A demand letter is something any tenant can send on their own behalf. If it comes to suing, deposit cases in Illinois go to the Small Claims Court (Circuit Court), which is built for people without lawyers and hears claims up to $10,000. Our service prepares the letter from the facts you provide and the current text of 765 ILCS 710/1 (Security Deposit Return Act), and mails it by USPS Certified Mail so you have proof of delivery. If your dispute is complex or high-value, talking to a licensed Illinois attorney is a sensible next step. Several statutes shift attorney's fees to the landlord.

General legal information about 765 ILCS 710/1 (Security Deposit Return Act), not legal advice. Statutes contain conditions and exceptions, so always check the official text of 765 ILCS 710/1 (Security Deposit Return Act).

If the letter doesn’t work: filing in Illinois

Where a Illinois claim is filed

A Illinois security deposit claim that does not settle is filed in the Small Claims Court (Circuit Court), which hears claims up to $10,000.

Fits under $10,000 while the deposit is below about $5,050. Note the math: above a deposit of roughly $5,050, the statutory ceiling passes the $10,000 limit, so a claim that large belongs in a higher court, or the excess can be waived to stay in small claims. Settling on a certified demand letter avoids that fork entirely.

The claim rests on 765 ILCS 710/1 (Security Deposit Return Act). Illinois’s deposit statute can shift attorney’s fees to the landlord, which matters even if you never hire one. Filing fees, forms and service rules are the court’s, not ours: the Illinois judiciary’s own small claims instructions are the authority to check before filing.

How much can I sue my landlord for in Illinois small claims court?
The Small Claims Court (Circuit Court) hears claims up to $10,000. Your claim is the withheld deposit plus whatever 765 ILCS 710/1 (Security Deposit Return Act) allows on top: up to 2× the wrongfully withheld amount, plus any statutory interest owed under 765 ILCS 715/1 (Security Deposit Interest Act). Fits under $10,000 while the deposit is below about $5,050.

General legal information, not legal advice. Court limits and procedures change; confirm with the clerk or a licensed Illinois attorney before filing.

Skip the trip to the Post Office.$20 covers the letter, the printing, the certified postage and the return receipt. No stamps, no green card to fill in wrong, no queue.
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Illinois · Renter guides

Before the letter: the arguments you are about to have

Illinois landlords have to show their working. These four guides are how you read that itemization the way a judge would.

Deductions The four things a deposit can legally cover Illinois makes the landlord put their deductions in writing. That list is the whole argument, and most of them do not survive being read closely. Read the guide → Wear and tear Where wear and tear ends and damage begins Landlords lean on the ambiguity because renters rarely push back on it. In practice the line is clearer than it looks once you have seen where it falls, item by item. See the line → Evidence Document the place before you unpack The strongest position at move-out is set at move-in. This is what to capture, and where to keep it so it still exists later. Get the checklist → No response The deposit never came back Most renters read a missed deadline as their own failure. It is the landlord's obligation that lapsed, not your right. What to do →

Arguing about one specific charge?

Move-out cleaningPaint chargesA carpet feeHanging picturesPet-related damage

Or run the whole list through the deduction checker for Illinois renters.

Neighboring states · Same problem, different math

Where else this letter works

Indiana45 daysInd. Code § 32-31-3-12Iowa30 daysIowa Code § 562A.12KentuckyStrict rulesKy. Rev. Stat. § 383.580Missouri30 daysMo. Rev. Stat. § 535.300 · 2×Wisconsin21 daysWis. Admin. Code ATCP § 134.06; Wis. Stat. § 100.20(5) · 2×All 50 states + DCSee the map →Deadline & penalty by state
Illinois cities

Deposit rules where you actually rent

Each of these has its own page with local rent figures and the court that would actually hear the claim. Start with security deposit deadlines in Chicago.

ChicagoCook CountySmall Claims Court (Circuit Court) · $10,000 limitAll 102 citiesSee the map →Local court, local rent, local statute
Chicago

Want to see the finished product first? Read an annotated sample demand letter, or see how Illinois ranks nationally on the Security Deposit Penalty Index.

Moved out of state since? We send security deposit demand letters for renters outside Illinois in all 50 states and the District of Columbia, each with its own statute and its own deadline math.

Illinois · Free help

Where Illinois renters can get help for nothing

Before or alongside anything you do here, these are the free Illinois sources worth knowing. Legal aid in particular takes housing questions from renters every day.

Government and nonprofit resources, listed because they are useful. We are not affiliated with any of them, and none of them is affiliated with us. Every link here was checked on August 30, 2026.

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