How it's counted: Written notice; aligns with end of monthly rental period.
How the deadline actually works in Illinois
Statute is phrased as the landlord's power; 30 days is applied to tenants by convention and lease — letters cite it descriptively ('the 30-day standard under 735 ILCS 5/9-207'). Week-to-week: 7 days (subsec. (a)).
Worked example: rent due on the 1st, written notice delivered June 10. The earliest compliant termination date is July 31, 2026 — notice must clear the required period and land on a rental-period boundary, which is the step most people miss. Our generator computes this date from your actual rent schedule.
Your lease can require more
State law is the floor, not the ceiling. If your lease requires more notice than the statute (60 days is common in larger complexes), the longer period controls. Read the termination or notice clause before sending anything — a proper letter satisfies both requirements at once.
What notice does your landlord owe you?
The other direction matters too: a Illinois landlord ending a month-to-month tenancy generally owes the tenant 30 days statewide; CHICAGO Fair Notice ordinance: 30 (<6 mo) / 60 (6 mo–3 yrs) / 120 days (>3 yrs) (735 ILCS 5/9-207(b); Chicago RLTO § 5-12-130). None statewide; Chicago tiers apply to landlord non-renewal.
Deliver it so it counts
Use a method that creates a record: hand delivery with a signed acknowledgement, or certified mail with return receipt. If your lease names a required delivery method, use that one. Keep a copy of the letter and the receipt — together they are your proof that notice was proper and on time.
Your Illinois notice, dated correctly, in 60 seconds
State rule applied, termination date computed from your rent schedule, deposit rights reserved.
Create My Notice — $9Primary source: official statute text / state guidance.
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WriteMyNotice.com is a self-help document preparation service, not a law firm, and this page is general information, not legal advice. Statutes change and leases can require more notice than state law — always check your lease and, for significant matters, consult a licensed attorney in your state. Statute references verified June 2026.