Illinois Rent Increase Notice Rules

Illinois rent increase rules at a glance

Illinois requires at least 30 days written notice for a rent increase on a month-to-month tenancy. There is no statewide rent cap, and the Illinois Rent Control Preemption Act (50 ILCS 825) prevents cities from enacting rent control. The Chicago Just Cause for Eviction Ordinance (effective 2024 in certain forms) adds protections around tenant terminations but does not impose rent caps.

The 30-day notice rule explained

For Illinois month-to-month tenancies, the rent increase notice must be served at least 30 days before the start of the rent period when the new rent will apply. Notice must be in writing and delivered in a manner consistent with the lease terms. If the lease is silent, certified mail or personal service is typical.

Illinois's preemption of local rent control

The Illinois Rent Control Preemption Act (50 ILCS 825) prevents cities and counties from enacting rent control or rent stabilization ordinances. Chicago, Evanston, Oak Park, and other major Illinois cities cannot cap rent at the local level. Periodic legislative proposals to repeal the preemption have not passed as of mid-2026.

Chicago-specific considerations

While Chicago cannot cap rent increases, the Chicago RLTO and Just Cause for Eviction provisions add protections around notice quality and retaliatory increases. Chicago landlords should document the legitimate business reason for any large increase and provide notice on time. Retaliatory rent increases (in response to a tenant complaint or fair-housing claim) are independently actionable.

Fixed-term leases in Illinois

For fixed-term leases (typically 12 months), rent cannot be raised mid-term. Increases apply at renewal. Most Illinois landlords specify renewal terms in the lease, including how rent will be adjusted at renewal.

How to use this calculator

Enter current and proposed rent. The calculator returns Illinois's 30-day notice requirement, increase percentage, and earliest legal effective date.

Frequently asked questions about Illinois rent increases

How much notice must an Illinois landlord give to raise rent?

At least 30 days written notice for a rent increase on a month-to-month tenancy.

Is there a rent cap in Illinois?

No. The Illinois Rent Control Preemption Act (50 ILCS 825) prevents cities from enacting rent control. There is no statewide rent cap.

Can Chicago cap rent increases?

No. Illinois state law preempts local rent control. The Chicago Just Cause for Eviction Ordinance protects against retaliatory terminations but does not cap rent.

Can an Illinois landlord raise rent during a fixed-term lease?

Generally no. A fixed-term lease locks in the rent for the term. Rent increases apply at renewal.

What is a fair Illinois rent increase amount?

Three to six percent annual is the typical band. Above 10 percent often triggers tenant turnover, especially in Chicago where rent burdens are high.