Is there a legal limit on late fees in Illinois?

No statutory cap (see reasonableness standard and notes). Illinois has no statewide residential late-fee statute, so the lease controls. The only backstop is general contract law: a late fee is liquidated damages, and an amount that functions as a penalty is unenforceable.

Does a late fee have to be written into the lease in Illinois?

Yes — in Illinois a late fee must be stated in the lease.

Can a landlord charge a daily late fee in Illinois?

Not addressed by statute. Daily fees are subject to general contract-law limits on penalties.

What late fees can a landlord charge in Illinois?

Verified July 8, 2026 All Illinois topics →

Legislative changes ahead — not yet in force. The rules on this page reflect the law in force today. The following measure would change it:

SB 1260 (104th General Assembly, 2025-2026) — Would repeal the Rent Control Preemption Act (50 ILCS 825), ending the statewide bar on local rent regulation and leaving home-rule and non-home-rule units free to consider rent-control ordinances. Repeal bills of this kind have been introduced in most recent sessions without passing.Status: Introduced February 2025; in Senate committee with no floor action. Alive until the 104th General Assembly adjourns in January 2027. (checked 2026-08-12).

Illinois sets no statewide cap on residential late fees and mandates no grace period — the Landlord and Tenant Act is silent on them — so a late fee must appear in the lease to be collectable and, if challenged, is tested under general contract law as liquidated damages rather than a penalty.

Cited to 765 ILCS 705 (Landlord and Tenant Act; no late-fee provision) · Verified July 8, 2026

The major exceptions are local: Chicago's RLTO caps late fees at $10 per month on the first $500 of rent plus 5% of any amount above that, and suburban Cook County has a similar ordinance, so landlords in those jurisdictions face much stricter rules than state law implies. Mobile-home parks are also separately regulated ($25 cap under the Mobile Home Landlord and Tenant Rights Act).

Illinois late fees at a glance

Statutory cap	No statutory cap (see reasonableness standard and notes)
Mandatory grace period	None mandated statewide
Must be in the lease	Yes
Daily fees	Not addressed by statute. Daily fees are subject to general contract-law limits on penalties.
Reasonableness standard	Illinois has no statewide residential late-fee statute, so the lease controls. The only backstop is general contract law: a late fee is liquidated damages, and an amount that functions as a penalty is unenforceable. The Landlord and Tenant Act (765 ILCS 705) contains no late-fee provision, and no other Illinois statute supplies one. Chicago (RLTO: $10 per month on the first $500 of rent plus 5% of the excess) and suburban Cook County impose local caps that are out of scope for this state-level record.

Cite this page: "Landlord Atlas, Illinois Late Fee Laws (verified July 8, 2026), landlordatlas.com/laws/late-fees/illinois/" — free to cite and quote with a link (how these records are verified). Every figure above is cited to the Illinois statute in the citations section below.

Check a late fee against the Illinois rules — free, no signup, built on the same verified Illinois rules as this page.

Notes and caveats

Chicago and Cook County cap what state law leaves open — The Chicago and suburban Cook County late-fee caps described above are local ordinances, out of scope for this state-level record — but they mean landlords in those jurisdictions face much stricter limits than state law implies.
No cap and no grace period — the statute is silent — No Illinois statute sets a late-fee cap or a grace period — the citation points to the official Landlord and Tenant Act text precisely to document that absence.

Common questions: Illinois late fees

Each answer is the verified value from the table above, restated as a direct answer. Free to quote with a link to this page.

Is there a legal limit on late fees in Illinois?: No statutory cap (see reasonableness standard and notes). Illinois has no statewide residential late-fee statute, so the lease controls. The only backstop is general contract law: a late fee is liquidated damages, and an amount that functions as a penalty is unenforceable.
Is there a grace period before rent is late in Illinois?: None mandated statewide.
Does a late fee have to be written into the lease in Illinois?: Yes — in Illinois a late fee must be stated in the lease.
Can a landlord charge a daily late fee in Illinois?: Not addressed by statute. Daily fees are subject to general contract-law limits on penalties.

Statute citations

765 ILCS 705 (Landlord and Tenant Act; no late-fee provision) (verified 2026) Official source

How this record was verified: Web verification against ilga.gov (official Illinois General Assembly ILCS database) for the Security Deposit Return Act (765 ILCS 710), Security Deposit Interest Act (765 ILCS 715), Landlord and Tenant Act (765 ILCS 705), Rent Control Preemption Act (50 ILCS 825), and 735 ILCS 5/9-207, with statute text confirmed via current-year compiled-statute mirrors of the ilga.gov database and IDFPR official guidance on deposit interest rates.