Illinois · IL

Demand letters in Illinois.

In Illinois, landlords must return a deposit within 45 days (30 days to send an itemized statement when deductions are claimed), and the Small Claims Court (Circuit Court) hears claims up to $10,000. Here's the law you need — and a generator that cites it for you.

Create a Illinois demand letter See the deadlines
By The Demand Letter Kit Team Sourced from official statutesUpdated June 1, 2026

Illinois demand letter facts at a glance

Deposit return deadline

45 days (30 days to send an itemized statement when deductions are claimed)

Small claims limit

$10,000

Filing fee

$89–$379 (varies widely by county)

Written-contract SOL

10 years

Personal-injury SOL

2 years

Legal/judgment interest

9% per year (post-judgment); 5% on most contract money judgments where no rate is set.

Security deposit demand letters in Illinois

If your former landlord is holding your deposit, Illinois law is on your side. A landlord must return your security deposit within 45 days (30 days to send an itemized statement when deductions are claimed), along with an itemized statement of any deductions. Bad-faith violations can expose the landlord to double the deposit amount plus attorney’s fees and court costs. Illinois also requires landlords to pay interest on deposits.

Governing statute: 765 ILCS 710 (Security Deposit Return Act) & 765 ILCS 715 · read it

Build a Illinois security-deposit letter

Statutes of limitation in Illinois

A demand letter doesn't pause the clock — you must file suit within these windows:

Written contracts 10 years
Oral contracts 5 years
Personal injury 2 years
Property damage 5 years

Small claims court in Illinois

If your demand letter is ignored, Illinois's Small Claims Court (Circuit Court) is usually the next step. It hears claims up to $10,000, with filing fees around $89–$379 (varies widely by county). You typically don't need a lawyer, and mentioning that you're prepared to file gives your letter real weight.

Illinois courts self-help

Good to know in Illinois

Illinois law is layered: the statewide Security Deposit Return Act gives 30 days to itemize deductions and 45 days to refund, the interest act requires interest for landlords of 25 or more units, and Chicago’s own ordinance adds stricter rules and stiff per-violation penalties. The general small claims limit is $10,000 in the Circuit Court. Because Illinois honors a long 10-year written-contract limitations period, older written agreements may still be enforceable — useful context for unpaid-debt demands, not just deposits.

Common demand letters in Illinois

Each generator automatically applies Illinois law where it matters.

Security Deposit Demand Letter

A formal letter demanding the return of your security deposit, citing your move-out date and your state’s legal deadline.

Create this letter

Unpaid Invoice Demand Letter

A firm final notice that tells a non-paying client exactly what they owe, by when, and what happens if they ignore it.

Create this letter

Contractor Dispute Demand Letter

A formal letter demanding a contractor finish the work, fix defective work, or refund your money under your agreement.

Create this letter

Debt Collection Demand Letter

A formal letter demanding repayment of money you are owed on a personal loan, IOU, or other unpaid debt.

Create this letter

Property Damage Demand Letter

A formal letter demanding payment from whoever damaged your property, backed by repair estimates and photos.

Create this letter

Unpaid Wages Demand Letter

A formal letter demanding an employer pay wages, overtime, or a final paycheck you earned and are owed.

Create this letter

Illinois demand letter FAQ

How long does a landlord have to return a security deposit in Illinois?
In Illinois, a landlord generally must return your security deposit within 45 days (30 days to send an itemized statement when deductions are claimed). Bad-faith violations can expose the landlord to double the deposit amount plus attorney’s fees and court costs. The governing statute is 765 ILCS 710 (Security Deposit Return Act) & 765 ILCS 715.
What is the small claims court limit in Illinois?
Illinois's Small Claims Court (Circuit Court) hears claims up to $10,000, with filing fees of roughly $89–$379 (varies widely by county). Most demand-letter disputes fall within this limit, which is what makes a demand letter such effective leverage.
How long do I have to sue in Illinois?
Illinois's statute of limitations is 10 years for written contracts, 5 years for oral contracts, 2 years for personal injury, and 5 years for property damage. Sending a demand letter does not pause these deadlines, so don't wait too long.
Do I have to send a demand letter before filing in Illinois?
Illinois does not always require a demand letter before suing, but sending one is strongly recommended: many courts expect it, it can resolve the dispute without filing, and it documents that you tried to settle in good faith — which helps your case if you do end up in Small Claims Court (Circuit Court).

Send a demand letter that cites Illinois law.

Build a professional, state-specific demand letter in minutes. Free to create — no account, no credit card, no watermark on your draft.

Create my demand letter Browse templates
  • Free to create — no signup
  • Drafted privately in your browser
  • Sourced from official statutes
  • State-specific statutes & deadlines