How to send a security deposit itemization in Illinois

In Illinois, a security deposit itemization may be delivered by First-Class mail, hand delivery; certified mail is not a listed method. The notice period is 30 days.

Last reviewed September 21, 2026 · Business research, not legal advice.

Requirement	Illinois security deposit itemization
Delivery method	First-Class mail, hand delivery
Notice period	30 days (calendar days)
Deemed received	When it is mailed
Notice must include	Within 30 days after the tenant vacates or the right of possession ends, whichever is later: the damage claimed, with the estimated or actual cost of each item and paid receipts or copies attached; an estimate's receipts within 30 days (765 ILCS 710/1)
If refused or unclaimed	keep the certified record.
Statutes	765 ILCS 710/1 (P.A. 103-224)

Step by step

Write the notice with every required element (the Illinois template in Cortul already has them).
Verify the recipient's mailing address with USPS.
Send it by a method the law allows, and keep a mailed copy.
Keep the mailing and tracking records, and your own record of any service you did yourself.
Calendar the deadline from the mailing date.