In Illinois, a landlord can raise the rent by any amount they choose. State law sets no ceiling, and no city or county is allowed to set one either. What the law does control is the process: your landlord has to give written notice before the new rent takes effect, and the required notice depends on your lease. Certain increases are also illegal regardless of amount, including those driven by discrimination or retaliation.
Why There Is No Dollar Limit
The Rent Control Preemption Act, at 50 ILCS 825, prohibits any local government in Illinois from passing an ordinance that controls rental prices for residential or commercial property.1Justia Law. Illinois Code 50 ILCS 825 – Rent Control Preemption Act The statute reaches home-rule cities too, so Chicago and other home-rule municipalities cannot cap what landlords charge even though they have broad self-governance authority in other areas.
The practical effect: when your lease is up, your landlord can propose whatever new rent they want. A 5% bump is legal. So is a 50% jump. Market conditions set the ceiling, not a statute.
How Much Notice Your Landlord Must Give
State law sets minimum notice periods based on how your tenancy is structured.
- Week-to-week: at least 7 days’ written notice before the increase takes effect.2Illinois 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.2Illinois 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 lease term expires, under 735 ILCS 5/9-205.
These are floors. Some local ordinances require more, and where they apply, the longer local period controls. If your landlord gives you less notice than the law requires, you are not obligated to pay the higher rent until proper notice has been given and the required period has run.
Rent Increases During a Fixed-Term Lease
If you signed a one-year lease or any other fixed-term agreement, your landlord cannot raise the rent until that term expires. The lease locks in both sides. The only exception is if the lease itself contains a clause permitting a mid-term increase, such as an escalation clause tied to taxes or operating costs. Without that language in the document you signed, no mid-term increase is enforceable.
When a fixed-term lease ends and you stay without signing a new one, most tenancies convert to month-to-month. From that point on, the landlord needs only 30 days’ written notice to raise the rent.2Illinois General Assembly. Illinois Code 735 ILCS 5/9-207 – Notice to Terminate Tenancy for Less Than a Year That’s considerably less protection than you had under a fixed term, so the lease expiration date is worth watching.
Chicago’s Longer Notice Rules
Chicago’s Fair Notice Ordinance stretches the notice window based on how long you have lived in the unit.
- More than 6 months but less than 3 years: 60 days’ notice before a rent increase.3City of Chicago. Know Your Rights – Fair Notice Ordinance
- More than 3 years: 120 days’ notice before a rent increase.3City of Chicago. Know Your Rights – Fair Notice Ordinance
The ordinance applies whether you have a formal written lease or an informal month-to-month arrangement. The same windows apply to non-renewals, so a landlord cannot dodge the rule by declining to renew rather than raising the rent. The ordinance does not apply once eviction proceedings have started for nonpayment or a lease violation.
Cook County has its own Residential Tenant and Landlord Ordinance covering unincorporated areas and certain suburbs. If you rent in suburban Cook County, check whether your municipality has adopted it, because the notice rules may exceed the state minimum.
When a Rent Increase Is Illegal Regardless of Amount
Two things can make an otherwise permissible increase unlawful: the reason behind it, and its timing.
Discrimination
The federal Fair Housing Act prohibits landlords from charging higher rent based on race, color, religion, sex, national origin, familial status, or disability.4United States Department of Justice. The Fair Housing Act The Illinois Human Rights Act adds protections for age (40 and over), sexual orientation, ancestry, marital status, military status, pregnancy, source of income, immigration status, order of protection status, and arrest record, among others.5Illinois Department of Human Rights. Fair Housing Division The source-of-income protection matters for voucher holders: a landlord cannot single you out for a larger increase because you pay with government assistance.
Retaliation
The Landlord Retaliation Act, at 765 ILCS 721, bars a landlord from raising rent to punish you for exercising legal rights, including complaining about code violations, requesting required repairs, contacting a government agency about housing conditions, or joining a tenants’ organization. If you engaged in any protected activity within one year before the increase, the law presumes the increase is retaliatory, and the landlord has to prove a legitimate, non-retaliatory reason.6Illinois General Assembly. Illinois Code 765 ILCS 721 – Landlord Retaliation Act
Situations With Different Rules
A few housing types operate outside the general no-cap framework.
Mobile Home Lots
If you rent a lot in a mobile home park, the Mobile Home Landlord and Tenant Rights Act limits when rent can go up. A park owner can only increase rent when the lease renews and must give written notice at least 90 days before the lease expires.7Illinois Department of Public Health. Illinois Code 765 ILCS 745 – Mobile Home Landlord and Tenant Rights Act
Section 8 Vouchers
If you use a Housing Choice Voucher, the landlord cannot raise the contract rent during the initial lease term.8HUD Exchange. Are Owners Allowed to Request a Rent Increase During the Initial Lease Term After that, any increase must be approved by the local public housing authority and must fall within the program’s payment standards. Your share of the rent is tied to your income, so a higher contract rent generally does not push your out-of-pocket payment above roughly 30% of adjusted gross income.
Low-Income Housing Tax Credit Buildings
If your building was built or rehabilitated with LIHTC funding, rent is capped at no more than 30% of an imputed income limit based on the area median income, and those restrictions stay in place for at least 30 years.9Office of the Law Revision Counsel. 26 USC 42 – Low-Income Housing Credit A large increase in a LIHTC unit may actually violate the property’s compliance obligations, so it is worth asking whether your building is subject to those covenants.
Active-Duty Servicemembers
The Servicemembers Civil Relief Act does not block an increase, but it lets you terminate a residential lease without penalty if you receive permanent change-of-station orders or deployment orders for 90 days or more.10Office of the Law Revision Counsel. 50 USC 3955 – Termination of Residential or Motor Vehicle Leases If a renewal increase is unaffordable and you have qualifying orders, you can leave rather than sign.