Illinois Security Deposit Demand Letter
765 ILCS 710
30 days after move-out
2× the deposit amount (plus attorney fees)
Illinois law is clear: under 765 ILCS 710, your landlord has exactly 30 days after you move out to either return your security deposit in full or send you an itemized written statement explaining every deduction. Miss that window, and the landlord loses their legal right to withhold any portion of the deposit.
A demand letter puts your landlord on formal notice that you know your rights under Illinois law and are prepared to act. It establishes the written record that small claims court — and your landlord's attorney — will want to see. Many landlords respond to a properly formatted demand letter simply because it signals you're serious and informed.
DemandFast generates a Illinois-specific demand letter that cites 765 ILCS 710 directly, states the exact return deadline that applied to your tenancy, and formally demands the return of your deposit, along with the statutory penalty of up to 2× the wrongfully withheld amount. The letter is formatted for certified mail — the delivery method courts and recipients expect — so you have proof of delivery when you need it.
If your landlord continues to ignore you after receiving the demand letter, your next step is to file a complaint with the Illinois Attorney General or pursue your claim in Illinois small claims court, where the demand letter becomes part of your documented case.
Frequently Asked Questions
How long does a landlord have to return a security deposit in Illinois?
Under 765 ILCS 710, Illinois landlords must return your security deposit within 30 days of move-out. They must also provide an itemized list of any deductions.
What happens if my landlord doesn't return my deposit on time in Illinois?
If your landlord misses the 30-day deadline, you may be entitled to penalties. Plus attorney fees. A demand letter creates the written record needed to pursue your claim.
Do I need to send a demand letter before suing my landlord in Illinois?
While not always legally required, a demand letter is strongly recommended. It establishes a clear timeline, puts your landlord on notice, and demonstrates good-faith effort to resolve the dispute before court. Many landlords respond to a formal letter rather than face litigation.