St. Clair County property tax appeal 2027: deadline, forms and how to file
To appeal a St. Clair County assessment, file with the St. Clair County Board of Review in person; in Illinois the deadline is 30 days after the township assessment list is published (Cook County uses township filing windows). Confirm the exact date on your notice or with the assessor; we add each county's 2027 date here when it is published.
Assessment list is published by township in local newspapers; the county posts the dates each year (2026 publication dates ran Aug 26 to Oct 8, 2026 depending on township). St. Clair County reassesses one of four assessment districts each year (quadrennial), so only some townships see new values in a given year.
Data as of 20 Oct 2026 · St. Clair County Board of ReviewCheck your own assessment
Free. We compare the value on your notice with recent sales of similar homes nearby and tell you whether an appeal is worth filing. Have your assessment notice and tax bill handy.
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How to file in St. Clair County
- Step 1
File the appeal
Use the method your notice lists, usually Form PTAX 230, by the deadline on the notice.
- Step 2 · before the hearing
Prepare and submit your evidence
Overvaluation must be shown by a preponderance of the evidence; a uniformity (equity) claim needs clear and convincing evidence. The strongest evidence is a recent arm’s-length purchase of your home, or an appraisal as of January 1. Otherwise use at least three comparable sales, or for equity at least three similar nearby homes with their assessments and property record cards, in a grid. Bring a photo of your home and its property record card.
- Step 3
Meet, then hear
An informal review with Township assessor or Supervisor of Assessments comes first; if you decline the offer, the St. Clair County Board of Review hears the case. Most reductions happen at the first step.
Before you file: how to read your notice · evidence that works · informal vs formal hearing · when not to appeal
Forms
| Form | Number | Use | Format |
|---|---|---|---|
| PTAX 230 2026 Complaint Form | PTAX 230 | St. Clair County Board of Review assessment complaint; one form per parcel, with parcel comparison grid and evidence | |
| Residential Appeal (Property Tax Appeal Board) | PTAB-1A | Only after the Board of Review decides: the state appeal, due 30 days after the board’s written notice. Can also be filed online through PTAB eFile. | Fillable PDF |
Appeal levels
| Level | Who hears it | Deadline | Cost |
|---|---|---|---|
| Informal review | Township assessor or Supervisor of Assessments | Before the Board of Review deadline | Free |
| Board of Review | St. Clair County Board of Review | 30 days after the assessment list is published | Free |
| Property Tax Appeal Board | Illinois Property Tax Appeal Board (state) | 30 days after the Board of Review’s written decision | No filing fee |
| Court | Circuit court (administrative review), or a tax objection in St. Clair County circuit court | 35 days after the PTAB decision; tax objections follow the tax-bill penalty date | Court costs |
What evidence the board accepts
Overvaluation must be shown by a preponderance of the evidence; a uniformity (equity) claim needs clear and convincing evidence. The strongest evidence is a recent arm’s-length purchase of your home, or an appraisal as of January 1. Otherwise use at least three comparable sales, or for equity at least three similar nearby homes with their assessments and property record cards, in a grid. Bring a photo of your home and its property record card.
St. Clair County questions
When is the St. Clair County appeal deadline for 2027?
No 2027 date is published yet. The board’s rule: County Board of Review rules: complaint must be filed at the Board office within 30 days of publication of the new assessment list, on the Board's prescribed form (PTAX 230 complaint form). The county posts a township-by-township publication schedule with a 'last date to appeal' (for 2026: Sept 25 to Nov 9, 2026 by township). If the Board proposes an increase, the taxpayer has 14 days from the postmark of the notice to file a complaint on it. Extension requests must be in writing and filed with the complaint on or before the statutory deadline.
How do I appeal my assessment in St. Clair County?
File the PTAX 230 2026 Complaint Form with the St. Clair County Board of Review, #10 Public Square, Belleville, IL 62220. Mailed complaints count as filed on the postmark date.
Should I talk to the assessor first?
Yes. The township assessor or the St. Clair County Supervisor of Assessments can fix record errors informally. Still file with the St. Clair County Board of Review by the deadline: a board complaint is required before any state appeal.
What evidence works best?
A recent arm’s-length purchase of your home or an appraisal as of January 1. Otherwise, at least three comparable sales, or three similar nearby homes with lower assessments, with property record cards and photos.
How do I contact the St. Clair County Assessor's Office (Supervisor of Assessments)?
Mail: St. Clair County Board of Review, #10 Public Square, Belleville, IL 62220. Phone: 618-825-2489. Hours and walk-in details: stclaircountyil.gov.
What if the Board of Review says no?
Appeal to the Illinois Property Tax Appeal Board within 30 days of the board’s written decision. There is no fee, and you can file online through PTAB eFile. A lowered value on an owner-occupied home carries over for the rest of the assessment period.
Check whether yours is over-assessed
Nearby counties
Monroe County · Madison County · Clinton County · Washington County · Randolph County · Bond County · Perry County
- St. Clair County Board of Review
- St. Clair County Board of Review Documents & Forms
- St. Clair County Board of Review Rules (PDF)
- St. Clair County Assessor
- St. Clair County 2026 Assessment Publication Dates (PDF)
- St. Clair County Quadrennial Reassessment Districts (PDF)
- 35 ILCS 200/16-55 — Board of Review complaints
- 35 ILCS 200/12-10 — Publication of assessments
- 35 ILCS 200/16-160 — Appeal to the Property Tax Appeal Board
- Illinois DOR — Assessment Appeals
- Property Tax Appeal Board — Filing your appeal
- Property Tax Appeal Board — FAQ
- U.S. Census Bureau, county population estimates (2024) and county gazetteer (2024).