An Illinois rent increase notice must be in writing and must give you at least 7 days (week-to-week), 30 days (month-to-month), or 60 days (year-to-year) before the new rate takes effect. Chicago tenants get more: 30, 60, or 120 days depending on how long they’ve lived in the unit. And if you’re inside a fixed-term lease, the rent can’t go up at all until that lease ends, no matter what notice arrives.
Illinois sets no cap on how much the rent can go up. The Illinois Rent Control Preemption Act bars every city, county, and home rule municipality from passing rent control.1Illinois General Assembly. Illinois Code 50 ILCS 825 – Rent Control Preemption Act So the fight, when there is one, is almost always about timing and notice rather than the dollar amount.
If You’re In a Fixed-Term Lease, the Rent Is Locked
A signed one-year (or other fixed-term) lease is a binding contract, and the rent is one of its core terms. Your landlord cannot raise it mid-term unless the written lease itself contains a clause specifically allowing adjustments, which is uncommon.2Illinois Attorney General. Landlord and Tenant Rights and Laws If a notice arrives in month six of a twelve-month lease announcing a higher rent starting next month, it isn’t enforceable.
What a notice does control is the renewal. When the lease term ends, the landlord can propose any new rent for the next period, and the notice rules below determine how far in advance that proposal has to reach you.
State Notice Periods by Tenancy Type
Once you’re outside a fixed term — either because you never signed a lease or because your lease expired and you kept paying — you’re in a periodic tenancy. The required notice tracks how often you pay rent.
- Week-to-week: at least 7 days’ written notice before the end of the weekly rental period.3Illinois General Assembly. Illinois Code 735 ILCS 5/9-207 – Notice to Terminate Tenancy for Less Than a Year
- Month-to-month: at least 30 days’ written notice before the end of the monthly rental period.3Illinois General Assembly. Illinois Code 735 ILCS 5/9-207 – Notice to Terminate Tenancy for Less Than a Year
- Year-to-year: at least 60 days’ written notice before the end of the yearly term; the notice can be given at any time within four months before the last 60 days of the year.4Justia Law. Illinois Code 735 ILCS 5/9-205 – Notice to Terminate Tenancy From Year to Year
- Mobile home park: 90 days.
The notice has to line up with the start of a new rental period, not just hit the day count. A landlord who sends a 30-day notice to a month-to-month tenant on the 15th cannot make the increase effective on the 1st of the following month, because that’s only about two weeks away. The clock also runs from when you actually received the notice, so if there’s any dispute, the postmark or delivery date matters.
These statewide figures are the floor. Some municipalities require longer, so check your local code if you’re outside Chicago. Suburban Cook County renters should ask whether the county’s Residential Tenant and Landlord Ordinance applies to their unit, because its rules can differ from the state baseline.
Chicago Requires 30, 60, or 120 Days
Chicago’s Fair Notice Ordinance, Municipal Code Section 5-12-130(j), builds a tiered system on top of state law based on how long you’ve been in the unit.5Municipal Code of Chicago. Chicago Municipal Code 5-12-130 – Landlord Remedies
- Less than 6 months in the unit: at least 30 days’ written notice before the termination date.
- 6 months to 3 years: at least 60 days’ written notice.
- More than 3 years: at least 120 days’ written notice.
The same rules apply to rent increases, lease non-renewals, and terminations of periodic tenancies.6City of Chicago. Know Your Rights – Fair Notice Ordinance
When a Chicago Landlord Gives Late Notice
Short notice doesn’t just slide the effective date forward. If your landlord fails to give the right amount of notice, you have the right to stay in the unit at your current rent. For tenancies under three years, that holdover runs up to 60 days from the date you actually received the written notice. For tenancies over three years, it runs up to 120 days.5Municipal Code of Chicago. Chicago Municipal Code 5-12-130 – Landlord Remedies Every other term of the tenancy stays as it was the month before the notice arrived. A landlord who rushes an increase effectively delays it.
What a Valid Notice Should Say
State law requires writing but doesn’t spell out a checklist. A workable notice identifies the tenant and the rental unit by address, states the current rent and the new amount, and specifies the exact date the increase takes effect — an effective date that aligns with the end of a rental period and respects the full required notice window.
Vague language is a problem. A note that simply says “your rent is going up next month” without a dollar amount or a specific date won’t hold up if challenged.
Email and text generally don’t count unless your lease specifically authorizes electronic notice. If your lease is silent on that, assume paper is required.
How the Notice Must Be Delivered
Illinois practice recognizes three delivery methods for tenancy notices. The simplest is handing the notice directly to the tenant. If the tenant isn’t there, it can be left with someone else living at the unit who is at least 13 years old. The third option is certified or registered mail with return receipt requested. If nobody is in possession of the premises at all, posting the notice on the property satisfies the requirement.
Keep whatever you receive, along with the envelope. The received date is what starts your notice period.
When a Rent Increase Isn’t Legal at All
Two separate laws limit why a landlord can raise your rent, even when the notice itself looks fine.
Retaliation
The Illinois Landlord Retaliation Act makes it illegal to raise rent in response to a tenant exercising legal rights, including reporting code violations to a government agency, joining or organizing a tenants’ union, requesting repairs required by building code, complaining about illegal landlord practices to a community organization, or testifying in court or an administrative proceeding about the condition of the unit.7Illinois General Assembly. Illinois Code 765 ILCS 721 – Landlord Retaliation Act A landlord can defend an increase by showing a legitimate basis unrelated to the protected activity, or that the increase was already in motion beforehand. Timing drives these cases: an increase that lands two weeks after you filed a code complaint looks retaliatory on its face.
Discrimination
The federal Fair Housing Act and the Illinois Human Rights Act both prohibit different rental terms based on protected characteristics. Under Illinois law, those classes include race, color, national origin, religion, sex, pregnancy, age (40 and over), marital status, sexual orientation, gender-related identity, military status, disability, and familial status.8Illinois Department of Human Rights. Frequently Asked Questions If you think an increase is motivated by discrimination, you can file a charge with the Illinois Department of Human Rights or the federal Department of Housing and Urban Development.
What To Do After You Get a Notice
Three real options: accept the new rent and stay, try to negotiate, or decline and move before the increase takes effect. Illinois law does not require landlords to justify the amount or offer a reason, so there’s no formal appeal.
Before you decide, check the math. Count from the date you received the notice to the proposed effective date and confirm it clears the minimum for your tenancy type. If you’re in Chicago, confirm which tier applies based on how long you’ve been in the unit. A notice that falls short of the required time is simply ineffective under state law until the correct period has elapsed, and in Chicago it entitles you to stay at your current rent through the 60- or 120-day holdover. If the notice is deficient, put your objection in writing and keep a copy.