Illinois Rent Increase Laws

Chicago Skyscraper Cityscape along the Chicago River in Illinois, USA.
Last updated iconLast updated April 14th, 2026

When raising a tenant’s rent payment amount, you can’t just play by your own rules. Instead, landlords in the Prairie State must follow specific legal protocols to keep their rental businesses compliant. Whether you’re working with a property management company or handling operations on your own, all landlords must adhere to Illinois rent increase laws.

While Illinois isn’t a rent-controlled state, local laws require landlords to notify tenants in advance of any lease-term changes. Here’s a complete guide to adjusting rent in Illinois, including a free rent increase letter template from TurboTenant.

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Illinois Rent Increase FAQs

How much can I raise rent in Illinois?

In Illinois, landlords can increase rent by any reasonable amount.

Is there a maximum late fee in Illinois?

Illinois law prohibits landlords from charging more than $20 or 20% of 1 month’s rent (765 Ill. Comp. Stat. 710/10).

Can I increase rent if the tenant is on a verbal agreement?

Yes, but follow the state’s notice requirement rules. Give tenants 30 days’ notice for all month-to-month agreements (765 Ill. Comp. Stat. 705/1). This also applies for fixed-term leases but does not apply if you’re landlording in Chicago. Chicago city’s notice protocol is 60 days if the tenant has lived there for over 6 months and 120 days for more than 3 years. (Chicago, Ill., Mun. Code § 5-12-130).