What counts as valid notice

A valid rent-increase notice in Illinois is delivered in writing, states the new rent amount, states the date the new rent starts, and gives you at least 30 full days before that date. A text message or a hallway conversation is generally not enough on its own.

What to do if the notice was short

Keep the notice and the envelope (or a screenshot with a timestamp). Reply in writing that the notice does not meet Illinois's 30-day rule and that you'll continue to pay the current rent until a proper notice is delivered. A local tenant-rights group can help you draft the letter.

IllinoisLast reviewed April 2026

How much notice is required for a rent increase in Illinois?

Quick answer

Illinois requires at least 30 days' written notice before a rent increase can start on a month-to-month tenancy. Verbal notice is not enough.

Step-by-step answer

Step 1
What counts as valid notice
A valid rent-increase notice in Illinois is delivered in writing, states the new rent amount, states the date the new rent starts, and gives you at least 30 full days before that date. A text message or a hallway conversation is generally not enough on its own.
Step 2
What to do if the notice was short
Keep the notice and the envelope (or a screenshot with a timestamp). Reply in writing that the notice does not meet Illinois's 30-day rule and that you'll continue to pay the current rent until a proper notice is delivered. A local tenant-rights group can help you draft the letter.

Plain English recap

Illinois requires at least 30 days' written notice before a rent increase can start on a month-to-month tenancy. Verbal notice is not enough.

Check your specific situation

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I use a Section 8 / Housing Choice VoucherHCV tenants follow different rules — increases require PHA approval and rent-reasonableness review.

Free legal help in Illinois

Walk through three quick steps to find the right tenant-rights program for your situation.

What do you need help with?

When you call, ask about: a tenant intake appointment

Say: "I'm a tenant and need help understanding my rights and options."

Bring: your lease, recent rent receipts, and any letters or notices from your landlord.

Tip: swipe left/right on mobile to move between steps.

State listings sourced from the federal Legal Services Corporation (LSC) grantee directory. Educational information, not legal advice or endorsement.

State source

765 ILCS 825 (Rent Control Preemption Act)

Educational only — not legal advice. Educational only — not legal advice. This page summarizes statewide rules and may not reflect city ordinances, your specific lease, or recent changes. For your situation, consult a licensed attorney or your local tenant-rights organization.

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