Is there a legal limit on late fees in Illinois?

No statutory cap (see reasonableness standard and notes). Illinois has no statewide late-fee statute for ordinary residential leases, 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.

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 October 1, 2026 All Illinois topics →

Legislative changes ahead — not yet in force. This page reflects the law in force today. The following measure would change Illinois's landlord-tenant law:

SB 1260 (104th General Assembly, 2025-2026) — Would repeal the Rent Control Preemption Act (50 ILCS 825), removing the statewide bar on local rent control. Status: Filed January 28, 2025 and referred to the Senate Committee on Assignments the same day; no committee or floor action since. It dies when the 104th General Assembly's term ends in January 2027. (checked October 1, 2026).

Illinois sets no statewide cap on residential late fees and mandates no grace period for an ordinary residential lease, since the Landlord and Tenant Act is silent on them, so a late fee rests on the lease 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) and 1 more cited source · Verified October 1, 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 caps them at $10 per month on the first $1,000 of rent plus 5% of any amount above that, so landlords in those jurisdictions face much stricter rules than state law implies. Mobile home park leases follow their own act, which bars any late-payment penalty until the rent is at least 5 days overdue (765 ILCS 745/12(a)).

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	Not addressed by statute
Daily fees	Not addressed by statute. Daily fees are subject to general contract-law limits on penalties.
Reasonableness standard	Illinois has no statewide late-fee statute for ordinary residential leases, 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. The one statewide rule is for mobile home parks: a park lease may not let the park owner charge a penalty fee for late rent without allowing the tenant at least 5 days after the due date to pay (765 ILCS 745/12(a)). 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 October 1, 2026), landlordatlas.com/laws/late-fees/illinois/" — free to cite and quote with a link (how these records are verified). Everything above is cited in the citations section below.

Check a late fee against the Illinois rules — free, no signup, built on the same verified Illinois law 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 for ordinary leases — No Illinois statute sets a late-fee cap or a grace period for an ordinary residential lease; the citation points to the official Landlord and Tenant Act text to document that absence. The only statewide late-fee rule is the 5-day minimum before a mobile home park may charge a late-payment penalty (765 ILCS 745/12(a)).

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 late-fee statute for ordinary residential leases, 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?: Not addressed by statute.
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.

Citations

765 ILCS 705 (Landlord and Tenant Act; no late-fee provision) (verified 2026) Official source
765 ILCS 745/12 (Mobile Home Landlord and Tenant Rights Act; late-payment penalty) · (a) (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. September 5, 2026 addendum: the decisive figures touched by the 2025-2026 enactments reviewed that day were re-read on the official host — 735 ILCS 5/9-106 and 5/9-121 and the Landlord Retaliation Act, 765 ILCS 721, on ilga.gov; the earlier reads stand as recorded. October 1, 2026: every section the security deposit, rent increase, late fee and entry answers rest on was read again on ilga.gov, with each section's source line and the Public Acts of the 104th General Assembly through Public Act 104-0854: the Security Deposit Return Act, the Security Deposit Interest Act, the Landlord and Tenant Act, the Mobile Home Landlord and Tenant Rights Act (765 ILCS 745), the Rent Control Preemption Act, 735 ILCS 5/9-207 and 5/9-213, and 420 ILCS 46/26 and 46/30. That reading found that Public Act 103-224 removed the five-unit threshold from the Security Deposit Return Act effective January 1, 2024; these pages had still stated the threshold and were corrected the same day. No act of the 104th General Assembly amends the deposit, interest or preemption acts; Public Act 104-479 adds 765 ILCS 705/35 from January 1, 2027.