In Illinois, before a landlord can take an unpaid-rent dispute to court, the tenant has to receive a written 5-day notice for nonpayment of rent. The requirement comes from 735 ILCS 5/9-209: the landlord demands the past-due rent in writing, gives the tenant at least five days to pay the full amount, and warns that the lease ends if payment doesn’t arrive. Pay in full inside the window and the notice is dead. Miss it, and the landlord can file an eviction case.
The notice is a prerequisite, not the eviction itself. No judge, no sheriff, no removal happens on the strength of a 5-day notice alone. What the notice does is open the door to a court filing once the deadline passes without full payment.
What the Notice Has to Say
Section 9-209 is thin on specifics. It requires a written demand that gives the tenant at least five days to pay and states that the lease terminates if the tenant doesn’t. It doesn’t lay out a field-by-field checklist. Courts, however, routinely toss eviction cases when the underlying notice is vague, inaccurate, or misleading, so practical precision matters as much as the bare statute.
At a minimum, a workable notice identifies the property (address and unit), states the exact dollar amount of past-due rent, and sets a clear payment deadline. The dollar figure should reflect only what the lease defines as rent. Rolling in late fees, utility charges, or other costs the lease doesn’t label as rent is one of the quickest ways to get a notice challenged, because the tenant can argue the demand overstates the debt. If the lease calls certain charges “additional rent,” those can be included; the cautious move is to demand base rent only and chase other balances separately.
Addressing the notice to the people who signed the lease is good practice. The statute refers to notifying “the tenant,” so there’s no requirement to list every adult occupant in the household.
The Mandatory Full-Payment Disclosure
Section 9-209 requires every 5-day notice to prominently include specific language telling the tenant that only full payment of the demanded rent will waive the landlord’s right to terminate the lease, and that partial payment won’t stop the process unless the landlord agrees in writing to accept it. The statute prescribes the phrasing, and the notice has to carry it verbatim.
Omit that language and a court can find the notice defective. The landlord would then need to serve a corrected notice and start a new five-day clock. The disclosure also protects the landlord: with it in place, cashing a partial payment doesn’t by itself waive the right to proceed.
How the Notice Has to Be Delivered
Under 735 ILCS 5/9-211, the landlord can use any one of four service methods:
- Personal delivery to the tenant.
- Substitute service by leaving the notice with a person at least 13 years old who resides at the property.
- Certified or registered mail with a return receipt from the tenant.
- Posting on the premises, but only if no one is living at or occupying the unit.
Personal delivery starts the clock immediately and is the easiest to prove. Substitute service works when the tenant isn’t home, as long as the recipient actually lives there. Certified mail builds a paper trail but adds transit time before the countdown begins. Posting is reserved for apparently abandoned units.
Whatever the method, document it. An affidavit from the person who served the notice, describing date, time, and manner of delivery, is standard. Without that proof, a tenant can challenge whether service ever happened.
Counting the Five Days
The day of service doesn’t count. If the notice goes out Monday, Tuesday is day one and the tenant has through Saturday to pay. Illinois courts generally count calendar days rather than business days. If the fifth day falls on a weekend or court holiday, some courts extend the deadline to the next business day. Filing the eviction even a day too early is grounds for dismissal.
Mail changes the math. Courts often add days for postal delivery before the five-day window begins to run, so a landlord serving by certified mail should wait additional days past the minimum before filing.
Paying to Stop the Eviction
Full payment of the demanded amount within the five days cancels the notice. The lease continues as though the default never happened, and the landlord can’t file an eviction based on that notice. The operative word is “full.” Paying $950 of a $1,000 demand leaves the notice live.
Pay in a way that creates a record. A money order, cashier’s check, or electronic transfer with a confirmation beats cash. Get a dated receipt. If a landlord refuses a timely full payment, that refusal becomes a defense in court, so document the attempt thoroughly: screenshots, witness statements, a certified-mail delivery of a money order.
Partial Payments
Partial payment is where things get risky for both sides. When the notice contains the required full-payment disclosure, the landlord can accept a partial payment and still proceed once the five days expire, provided the balance isn’t paid in time. Without that disclosure, accepting partial rent can look like a waiver: the tenant can argue the landlord took the money and implicitly agreed to continue the tenancy.
For a tenant who can’t pay everything, partial payment alone doesn’t save the lease. The only reliable way to stop the eviction with less than the full amount is a written agreement from the landlord accepting it in lieu of the full demand, signed before any money changes hands.
Chicago Tenants Get an Extra Chance
Chicago adds a layer that state law doesn’t. Under Section 5-12-130 of the Chicago Municipal Code, a tenant facing eviction for nonpayment has a one-time right to stop the case by paying all unpaid rent from the date of the notice through the date of payment, plus the landlord’s filing fees and service-of-process costs. Attorney’s fees are not included. If the tenant pays that full amount at any point before the court enters an order of possession, the case has to be dismissed.
This cure window is much wider than the state’s five days. A Chicago tenant who misses the five-day deadline can still halt the eviction weeks later, as long as no possession order has been entered and the tenant hasn’t already used this one-time right during the current tenancy.
When Five Days Is the Wrong Notice
Two situations change the required notice period entirely.
For properties with a federally backed mortgage or federal housing subsidies, the CARES Act requires a 30-day notice to vacate before eviction proceedings for nonpayment. As of early 2026, that federal requirement is still in effect. Covered properties include those with mortgages insured or guaranteed by Fannie Mae, Freddie Mac, or FHA, along with public housing and properties receiving direct Section 8 project-based payments. Tenants unsure whether their building qualifies can check Fannie Mae’s Renter Resource Finder, Freddie Mac’s Multifamily Property Lookup, or HUD’s FHA-insured property database. A 5-day notice on a covered property is the wrong notice, and the tenant can challenge the eviction on that basis.
Active-duty service members get additional protection under 735 ILCS 5/9-107.10. If military service materially affects the tenant’s ability to pay rent, the court must grant relief when the tenant or a family member asks for it: a stay of the eviction for up to 90 days (longer if justice requires), and in some cases an adjustment of the rent obligation. The tenant or a household family member must provide the landlord with a copy of military orders calling the tenant to service for more than 29 consecutive days. Violating these protections is a civil rights violation under the Illinois Human Rights Act.
Defenses a Tenant Can Raise
A notice that looks valid can still fall apart in court. Common defenses Illinois courts recognize:
- The rent was already paid, and the tenant has receipts or bank records to prove it.
- The amount demanded is wrong, often because fees or non-rent charges got bundled in.
- The notice is defective: no mandatory full-payment disclosure, wrong address, missing deadline.
- Service didn’t follow one of the four methods allowed under Section 9-211.
- The landlord filed the eviction before the five-day window expired.
- The unit was uninhabitable, so its diminished value offsets the rent owed.
- The eviction is retaliation for a code complaint or repair request.
- The landlord’s conduct after the notice period (such as accepting rent without the proper disclosure in place) reaffirmed the lease.
Raising a defense doesn’t guarantee dismissal, but it puts the burden on the landlord to show the process was followed cleanly.
What Happens If the Five Days Pass
Once the window closes without full payment, the landlord can file a Forcible Entry and Detainer complaint in the local circuit court. That filing, not the 5-day notice, is the eviction lawsuit. The court issues a summons that has to be served on the tenant through the normal court-summons rules (not the Section 9-211 notice rules), and a hearing is typically scheduled within a few weeks. If the tenant doesn’t show, the court can enter a default judgment for possession and the back rent.
One hard limit on landlords through all of this: self-help is illegal in Illinois. Changing the locks, removing doors, or shutting off utilities to force a tenant out is unlawful no matter how far behind the tenant is. The only lawful path to removal runs through the court and the sheriff. A tenant locked out or cut off by a landlord can sue for damages, including the cost of temporary housing and lost or damaged belongings.