--- title: Illinois security deposit demand letter and mailing guide description: Review Illinois Security Deposit Return Act, 765 ILCS 710/1, distinguish the landlord deadline from your mailing choice, and prepare a supported Illinois tenant deposit-recovery packet. seotitle: Illinois Security Deposit Demand Letter | Illinois Security Deposit Return Act, 765 ILCS 710/1 seo-description: Illinois deposit-return timing, source links, mailing-method distinctions, and a guided demand packet with evidence, PDF preview, and Certified Mail checkout. group: use-cases indexable: true llms: true schema: article og-type: article eyebrow: Tenant deposit guide published: 2026-10-15 updated: 2026-10-15 tags: - tenant-notices - security-deposit path: /notices/illinois/security-deposit-demand --- # Illinois security deposit demand letter and mailing guide Review Illinois Security Deposit Return Act, 765 ILCS 710/1, distinguish the landlord deadline from your mailing choice, and prepare a supported Illinois tenant deposit-recovery packet. ## Feature list - State-specific primary sources - Guided principal-only demand - Evidence and PDF preview - Certified Mail checkout ## Can PostalForm help recover a Illinois security deposit? PostalForm helps Illinois renters prepare a factual security deposit demand after a supported private residential tenancy has ended. Enter the deposit and move-out facts, attach evidence, and review a principal-only packet before Certified Mail checkout. The mailing records your request; it does not determine entitlement or guarantee payment. ## Illinois deadline and mailing method | Question | Source-based answer | | --- | --- | | Main provision | Illinois Security Deposit Return Act, 765 ILCS 710/1 | | Landlord timing reference | 30 days for the damage statement; 45 days for full return if the required statement and records are not furnished | | Summary and limits | For damage deductions, the statement is generally due within 30 days of vacating or the end of possession, whichever is later. If required statements and receipts are not furnished, the Act calls for full return within 45 days of vacating. Local ordinances may add protections. | | Whose mailing duty is described? | The Act permits the landlord damage statement by personal delivery, postmarked mail, or verified email. That does not require every tenant demand to use Certified Mail. PostalForm uses it to document the packet mailing. | | PostalForm workflow | Certified Mail is required by this packet product; that is not a claim that state law always requires it | | Return receipt | Optional evidence of the delivery signature when available, not proof that the landlord agrees | ## Use when and avoid when | Use this guided packet when | Use another route when | | --- | --- | | Your ordinary private residential tenancy ended and you surrendered possession | You still occupy the property or need to terminate the lease | | You want a factual demand for the disputed deposit principal | You need a court filing, penalties, interest, damages, or a legal opinion | | You have a verified landlord or manager mailing address | Recipient identity or service requirements are disputed | | No active legal deadline or proceeding requires action | A claim-notice objection, hearing, or filing deadline is running | ## Records to prepare Vacating and possession-end dates, local jurisdiction, the damage statement and receipts, forwarding-address notice, photographs, and the lease. State-specific example: A renter receives a damage estimate and disputes the amount. The packet includes the estimate and photographs, identifies the disputed principal, and requests the supporting records; it does not automatically add statutory damages. ## How to prepare and mail the packet 1. Open the [Illinois guided packet](/forms/security-deposit-demand-packets?rental_state=Illinois), confirm the supported scope, and enter your rental and deposit facts. 2. Attach evidence, choose verified recipients, and review the complete PDF. 3. Approve the packet, confirm Certified Mail options and the current price, and complete checkout. Save the final PDF and carrier records. ## What does Certified Mail prove? PostalForm offers Certified Mail to document carrier acceptance and delivery or attempted delivery of your demand. An Electronic Return Receipt, when selected and available, adds a delivery-signature record. These records do not prove the contents are correct, establish legally sufficient service, extend a deadline, or establish that the landlord paid. ## Sources - [Illinois General Assembly, Security Deposit Return Act](https://www.ilga.gov/Legislation/ILCS/Articles?ActID=2202&ChapterID=62) - [Illinois Security Deposit Return Act, 765 ILCS 710/1](https://www.ilga.gov/Legislation/ILCS/Articles?ActID=2202&ChapterID=62) Source review: October 15, 2026. Check the current text and local rules for your tenancy before relying on a deadline. ## Which mailing option and proof should you choose? PostalForm offers U.S. letter mailing with different delivery and proof options. First-Class suits routine correspondence; Certified Mail adds mailing and delivery records, and Electronic Return Receipt adds a downloadable signature record. Expedited delivery prioritizes speed. Review the destination, estimated dates, total price, and required proof before paying. | Mailing option | Delivery speed | Proof | Use when | Avoid when | | --- | --- | --- | --- | --- | | USPS First-Class Mail | First-Class Mail delivery estimate shown before payment. | Available processing scans; no recipient signature or Certified Mail receipt. | Routine letters when a signed delivery record is unnecessary. | Your instructions require Certified Mail, a signature, or a deadline this estimate cannot meet. | | Certified Mail | First-Class delivery speed; certification does not make delivery faster. | USPS mailing and delivery/attempt tracking; no Electronic Return Receipt unless added. | You need a recorded mailing and delivery or attempted-delivery status. | You need a downloadable signature record or faster delivery. | | Certified Mail + Electronic Return Receipt | First-Class delivery speed; signature collection may require redelivery or pickup. | Certified Mail records plus a downloadable USPS signature record when available. | Your instructions call for Certified Mail with Return Receipt or you need the signature record. | Your recipient requires an original enclosure, personal service, or another submission method. | | Expedited / Express with signature | Faster estimated delivery range shown at checkout; production cutoff and destination apply. | Carrier tracking and signature option; this is separate from Certified Mail and ERR. | Speed and signature matter and checkout offers the service for your destination. | A rule specifically requires Certified Mail or the displayed estimate misses your deadline. | Availability and delivery estimates depend on the document and destination. Mailing proof does not establish that a recipient accepted a filing or that legal service requirements were met. [Review delivery estimates](/delivery-times) and [full pricing](/pricing). ## FAQs - **Does Illinois always require Certified Mail for a tenant deposit demand?** Do not infer a tenant mailing rule from a landlord refund or claim-notice rule. Follow the cited statute, applicable local rules, and your situation. Certified Mail is the mailing choice required by this PostalForm packet workflow. - **Can I add photos and send a copy to the property manager?** Yes. The supported workflow accepts PDF and image evidence and can prepare separate reviewed mailpieces for the landlord, property manager, or registered agent when you supply the correct recipient details. ## Resources - [Tenant notices and deposit guides](/notices) ## Related - [California security deposit demand letter and mailing guide](/notices/california/security-deposit-demand) - [Texas security deposit demand letter and mailing guide](/notices/texas/security-deposit-demand) - [New York security deposit demand letter and mailing guide](/notices/new-york/security-deposit-demand) - [Florida security deposit demand letter and mailing guide](/notices/florida/security-deposit-demand) ## Ready to send it? For a supported ended private residential tenancy. Review the facts, principal-only demand, evidence, and recipients before Certified Mail checkout. [Build a Illinois deposit packet](/forms/security-deposit-demand-packets?rental_state=Illinois)