Illinois Rent Increase Calculator 2026
How much can rent increase in Illinois? Enter the current and proposed rent, then review the applicable statewide rule, notice baseline, exemptions, local-rule checks and official source before serving a notice.
Illinois rent increase quick answer
Rule: No general statewide percentage cap is configured for ordinary private-market rentals.
Who it applies to: Coverage depends on the property, tenancy type, lease terms, exemptions and any local ordinance or regulated-housing program.
Notice requirement: Review required before serving notice.
Last verified: 2026-09-19
Official source: Linked below.
Illinois rent increase rule
Illinois does not impose a general statewide percentage cap on ordinary private-market residential rent increases, and 50 ILCS 825/5 bars units of local government from controlling the amount of rent charged for private residential or commercial property, while preserving control of residential property in which the local government has a property interest. Current Illinois Attorney General guidance states that rent cannot be raised during a fixed-term lease before the lease expires. The ordinary statewide materials reviewed do not establish one universal standalone rent-increase notice period for every residential tenancy, so Max Rental Tools keeps automated Illinois notice timing review-gated rather than converting termination-notice rules into a universal increase deadline. Chicago has separate local Fair Notice timing rules, and mobile-home park leases use a distinct 765 ILCS 745/9 rule requiring 90 days' notice before a renewal rent increase. The Landlord Retaliation Act, 765 ILCS 721/5, separately prohibits specified retaliatory rent increases after protected tenant activity.
Reference: 50 ILCS 825/5; 765 ILCS 721/5; Illinois Attorney General landlord-tenant guidance; 765 ILCS 745/9
Source verified: 2026-09-19 · This primary source governs the state-level rule record used by connected Max Rental Tools workflows.
Official government source Editorial & verification policyConnected Illinois rental tools
This guide is connected to the same dependency graph used by the calculator, rent-increase notice/PDF workflow, related articles, local guides and translated document pages. A verified rule change can therefore be traced to every downstream surface that may require review.
Common Illinois rent increase questions
How much can a landlord raise rent in Illinois?
No statewide percentage cap is configured in this tool for Illinois. Lease terms, notice rules and local ordinances may still restrict an increase.
How much notice is required for a rent increase in Illinois?
Review required. The notice period can depend on tenancy length, lease term, increase size, housing status or other state-specific facts, so use the current official source before serving notice.
Can a landlord raise rent during a lease in Illinois?
A fixed-term lease can restrict when rent changes take effect. Review the lease plus current state and local law before serving a notice.