Build a working file
Illinois security deposit evidence should show the timeline, the deposit amount, your address notice, the condition of the rental, and whether the landlord sent a proper itemized statement with receipts or other required support.
Think of this as your working file. Each document should help answer one practical question: what date controls, where the landlord was supposed to send the response, what was deducted, what proof supports it, and what amount is still owed.
Timeline evidence
- Lease or rental agreement
- Move-in date
- Move-out date
- Date your right of possession ended, if different
- Key or access return proof
- Messages about move-out or surrender of the unit
Deposit and address evidence
- Deposit payment receipt, canceled check, ledger, or lease record
- Current mailing address notice
- Verified email address notice, if used
- Proof the landlord received your address information
Condition evidence
- Move-in photos and videos
- Move-out photos and videos
- Cleaning receipts
- Repair or maintenance requests
- Messages about condition issues
Deduction evidence
- Itemized damage statement
- Paid receipts or copies
- Estimates
- Follow-up paid receipts after estimates
- Any substitute proof or verified statement explaining missing receipts
- Lease section used for a specified cleaning, repair, or replacement charge
- Refund records
Demand and court-prep evidence
- Demand letters
- Delivery proof
- Landlord responses
- Notes showing the amount still owed
- If interest is involved, proof the property qualifies under the Illinois Security Deposit Interest Act
Related Illinois guides
- Illinois security deposit deadline
- What can an Illinois landlord deduct?
- Illinois security deposit demand letter
- Illinois small claims basics
Once the file is organized, your written demand can be much more precise. You can point to the timeline, the address or verified email record, the itemized statement, receipts, estimates, photos, and delivery proof instead of arguing in general terms.
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Important: This page provides general information and is not legal advice.