My Chicago Month-to-Month Tenant Is Leaving Mid-Month and Won't Pay. What Now?
Rent through the notice period, a deposit the tenant wants applied, and a unit about to sit empty. Three questions, three different rules.
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The message arrives on the first of the month. Your month-to-month tenant is moving out in a couple of weeks, and they are not paying October's rent. Maybe they add a suggestion: just keep the security deposit and call it even.
That message raises three separate questions. When does the tenancy actually end? How much rent is owed through that date? And what happens to the deposit? Each one has its own answer, and they don't all point the same direction.
- A month-to-month tenancy generally doesn't end the day a tenant announces they are leaving.
- The 30-day notice duty for tenants comes from common law and the lease, not from a statute.
- A security deposit stays the tenant's property, and nothing in the RLTO lets a tenant direct that it be used as the last month's rent.
- If the landlord re-rents the unit, the new rent reduces what the departing tenant owes. In RLTO-covered buildings, 5-12-120 requires a good-faith effort to re-rent.
Where the 30-Day Rule Comes From
The Illinois statute that people point to is 735 ILCS 5/9-207(b). It says that "in all cases of tenancy for any term less than one year, other than tenancy from week to week, where the tenant holds over without special agreement, the landlord may terminate the tenancy by 30 days' notice, in writing".
Two details in that sentence matter. First, the statute is written for the landlord. It describes how a landlord may end the tenancy, not what a tenant owes when leaving. Second, the phrase "without special agreement" means a lease can set different terms. A written month-to-month agreement with its own notice clause would generally control over the default, though in Chicago a lease can't shorten the landlord's notice below the RLTO's Fair Notice minimums or give the two sides unequal termination rights without a separate written disclosure (5-12-140).
The tenant's matching duty to give 30 days' notice comes from common law and from the lease itself, not from that statute. Ending the tenancy at the close of a rental period is common practice, but Illinois statutes don't spell out that requirement for a tenant's notice. When a tenant's notice lands in the middle of a month, that gap is where the uncertainty lives.
In Chicago, a landlord ending a month-to-month tenancy also has the RLTO's Fair Notice rule (5-12-130(j)) to account for. That side of the relationship is covered in Chicago Month-to-Month Lease Rules.
Counting the 30 Days: A Worked Example
Illinois counts statutory time periods under 5 ILCS 70/1.11: the first day is excluded and the last day is included.
Take a month-to-month tenant who gives notice on Thursday, October 1. Excluding October 1 and counting forward 30 days lands on Saturday, October 31. Section 1.11 also moves a deadline that falls on a Saturday, Sunday or holiday to the next business day. Whether that applies to a tenant's notice under a lease, rather than a statutory deadline, isn't settled, and a lease's own counting language would control. On either reading, October's full rent would generally be owed, even if the tenant hands back the keys on October 15. A lease that sets a different notice period would change the math.
What about a partial month? No Illinois statute sets a proration rule for a tenant who leaves early in a rental period. A tenant moving out mid-month doesn't, by that act alone, reduce the rent owed for the notice period.
"Just Keep the Deposit" Isn't the Same as Paying Rent
Under RLTO 5-12-080(a)(1), the security deposit stays the tenant's property. The ordinance treats it separately from prepaid rent, and nothing in 5-12-080 lets a tenant direct that it be used as the last month's rent. The landlord may agree to do that, and if so, putting the agreement in writing keeps both sides clear on what was traded for what.
After move-out, the deposit can only be reduced for unpaid rent and for damage, itemized, under 5-12-080(d). It can't simply be kept as a penalty for short notice or a difficult exit. The distinction between a deposit and a last-month payment is explained further in Security Deposit vs. Last Month's Rent in Chicago.
The stakes on the deposit side are real. An RLTO landlord who returns a deposit late, or skips the itemized statement, faces twice the deposit plus interest under 5-12-080(f), and a tenant who sues and wins can recover court costs and attorney's fees under 5-12-180.
"The deposit belongs to the tenant until the rules say otherwise. It isn't a substitute rent check, and it isn't a penalty fund."
The Duty to Re-Rent
Rent owed through the end of the notice period is one piece. The RLTO adds another. Under 5-12-120, when a tenant leaves early, the landlord must make a good-faith effort to re-rent the unit at a fair rental. If the unit is re-rented, that new rent reduces what the departing tenant owes.
RLTO 5-12-130(e) addresses abandonment. A unit is treated as abandoned when the tenant gives actual notice that they won't return, or after the absences the section specifies. The same re-rent duty applies there too. A tenant who tells the landlord "I'm out on the 15th, not coming back" may be giving exactly that kind of actual notice. The broader early-departure picture is in Tenant Breaking a Lease Early in Chicago.
What Generally Doesn't Fit This Situation
A 5-day notice and an eviction filing. A 5-day notice is built to end a tenancy and lead to an eviction case, which usually isn't the goal when the tenant is already on the way out.
Self-help. Changing the locks once the tenant is half moved out, shutting off utilities, or removing their belongings is unlawful in Chicago under 5-12-160, unless the unit has been abandoned as 5-12-130(e) defines it. That ban applies to owner-occupied buildings too. The consequences are covered in Self-Help Eviction in Chicago.
Every one of these answers turns on the lease, the dates, and the building. DwellerIQ can run the notice count against a specific lease and flag which deposit framework applies before anything goes out the door.
Key Takeaways
- 735 ILCS 5/9-207(b) gives landlords a 30-day written notice to end a tenancy of less than a year, absent a special agreement; it is written for the landlord
- A tenant's 30-day notice duty comes from common law and the lease, and Illinois statutes don't fix a tenant's notice to the end of a rental period
- Under 5 ILCS 70/1.11, the first day is excluded and the last included, so notice on October 1 counts to October 31 (a weekend roll-forward under 1.11 may or may not apply to a lease notice)
- There is no statutory proration rule for a tenant who leaves early in a rental period
- The deposit is the tenant's property (5-12-080(a)(1)); using it for the last month requires the landlord's agreement
- Deductions are limited to unpaid rent and itemized damage (5-12-080(d)); late return or no statement can mean twice the deposit plus interest (5-12-080(f)) and attorney's fees (5-12-180)
- The RLTO's re-rent duty (5-12-120), including after abandonment (5-12-130(e)), can reduce what the departing tenant owes
- Self-help is unlawful in Chicago under 5-12-160, including in owner-occupied buildings
Common Questions
Thirty days is the usual baseline, but for tenants it comes from common law and the lease rather than a statute, and a lease can set different terms. When that period ends is the harder question.
It generally turns on when the notice period ends, not the move-out date. Illinois has no statutory proration rule for a tenant leaving early in a rental period.
Not unilaterally. Under RLTO 5-12-080(a)(1) the deposit stays the tenant's property, and nothing in 5-12-080 lets a tenant direct that it be used as the last month's rent. The landlord may agree to apply it, in writing.
In an RLTO-covered building, deductions are limited to unpaid rent and reasonable, itemized damage under 5-12-080(d), and re-renting the unit reduces what is owed (5-12-120). Owner-occupied buildings of six or fewer units follow the state Security Deposit Return Act and the state mitigation duty (735 ILCS 5/9-213.1) instead.
