Is a rent increase legal in Illinois?
No statewide rent cap. Rent Control Preemption Act bars local caps (repeal under debate). Chicago: 30-day notice for tenancies under 6 months, longer for established tenancies.
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Cities in Illinois
How much can rent increase in Illinois?
Illinois does not currently impose a statewide cap on rent increases. That means landlords can generally raise rent by any amount when a lease ends, as long as they provide proper notice. However, individual cities may have local rent control ordinances — check your municipality's rules.
Notice requirements
Illinois requires landlords to give at least 30 days written notice before raising rent on a month-to-month tenant. For fixed-term leases, increases generally only take effect at renewal.
Source
Reviewed against 765 ILCS 825 (Rent Control Preemption Act) (opens in new tab) as of April 2026.