Preliminary notices in Illinois
Illinois is one of the states with no general preliminary notice for subcontractors on commercial work in our summary. That doesn't mean you can skip paperwork: the lien itself still has a hard deadline, and the other notices below still apply.
There is one more step: subcontractors and suppliers give a 90-day notice to owner within 90 days after your last day furnishing labor or materials. It is required. Owner-occupied residential: within 60 days of first furnishing.
Lien filing deadline in Illinois
If the GC hired you, you have 4 months after your last day furnishing labor or materials to record a mechanics lien in Illinois, about 32 days longer than the national median of 90 days (counted from last furnishing on a sample job). 40 of the 51 jurisdictions we track have a shorter lien deadline and 7 have a longer one.
4 months after completion to hold rights against lenders and buyers.
The clock starts on your last day furnishing labor or materials under your contract. In many states, warranty visits and punch list work done mainly to extend the deadline don't restart it, so use your last day of real contract work.
Deadline to sue on the lien
To keep the lien alive you must sue to enforce it within 24 months after your last day furnishing labor or materials. That comes to about 731 days after your last day on the job, about 366 days longer than the national median of 365 days. 39 of the 48 jurisdictions we track have a shorter overall time to sue and 8 have a longer one.
Illinois counts the suit deadline from last furnishing, not from recording, so recording late eats into the time left to sue.
Or 30 days after an owner's written demand to sue.
How Illinois compares
Days are counted on a sample job with the lien recorded on its last allowed day, so states that count from recording or from completion can be compared with those that count from your last day on site. The median is across the jurisdictions with a dated rule on file.
- Record the lien (from last day)
- Illinois: 122 daysNational median: 90 days
- Sue to enforce (from last day)
- Illinois: 731 daysNational median: 365 days
Public and federal projects
Public property can't be liened. On state and local public work in Illinois, subcontractors and suppliers protect themselves with these payment bond steps instead:
| Step | Who | Deadline |
|---|---|---|
| Verified notice of claim | Subcontractors and suppliers | 180 days after your last day furnishing labor or materials (verify) |
Federal jobs in Illinois follow the Miller Act instead of state law: those hired by a sub or supplier give the prime contractor notice within 90 days of their last furnishing, and suit is due within 1 year, in federal court. Prime contractors on federal work have no lien or bond claim.
Retainage and prompt payment in Illinois
On public work the cap is 10%, above the 5% median of states that set one. Up to 10% until 50% complete, then up to 5%. It also steps down partway through the job, so check that your pay applications reduce retainage when the project reaches the threshold.
On private work we have no statutory cap on file, so retainage is usually whatever the contract says. Read the retainage and release clauses before you sign.
| Public work | Private work | Federal work | |
|---|---|---|---|
| Retainage cap | 10% | Verify | 10% |
| Release | With final payment. | Verify with state statute | Released with final payment, or earlier once progress is satisfactory. |
| GC pays subs within | Verify | Verify | 7 days |
| Late-payment interest | Verify | Verify | Treasury prompt payment rate (reset every January and July) |
Not legal advice. Retainage and prompt payment rules differ by agency, contract size and contract date, and change often. Confirm the rules with the current statute, your contract and a construction attorney before relying on them.
Worked example: a concrete sub in Illinois
A concrete subcontractor hired by the GC on a private apartment building in Illinois starts work on March 2, 2026 and last furnishes on July 17, 2026. The project is completed on August 28, 2026. Run through Illinois's rules, those dates give:
| Deadline | Date | Counted from |
|---|---|---|
| 90-day notice to owner | October 15, 2026 | Last furnishing |
| Record the lien | November 17, 2026 | Last furnishing |
| Sue to enforce the lien | July 17, 2028 | Last furnishing |
The first deadline on the calendar is “90-day notice to owner” on October 15, 2026.
Open the lien deadline calculator for Illinois and enter your own dates to get this table for your job, with countdowns and a PDF deadline calendar.
Check your own dates with the free tools
- Mechanics lien and notice deadline calculator (IL): every notice, lien and suit date for your role, tier and job type, including public bond claims.
- Retainage and prompt payment rules (IL): check your contract's retainage against the cap and work out late-payment interest.
- Schedule of values and pay application builder: bill each period with retainage calculated, so what you're owed is documented.
- Cash flow and retainage forecaster: see what slow payment and held retainage do to your bank balance.
Statutes cited
- 770 ILCS 60
- 30 ILCS 550 (public bonds)
- 30 ILCS 540 (State Prompt Payment Act)
- 815 ILCS 603 (Contractor Prompt Payment Act)
- Federal work in Illinois: 40 U.S.C. §3131 to §3134 (Miller Act)
Not legal advice. Lien and bond claim rules change and have exceptions for project type, contract terms and how notices are served. Confirm every deadline with the current statute or a construction attorney in the project's state before relying on it. Rules shown as "Verify with state statute" have exceptions or variations we could not reduce to one number.