Hamilton County property tax appeal 2027: deadline, forms and how to file
To appeal a Hamilton County assessment, file with the Hamilton 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.
For tax year 2025 the assessment list was published in the McLeansboro Gazette with a county notice giving a complaint deadline of January 12, 2026 (publication is late in the year; the publication date itself is not stated on the posted notice).
Data as of 20 Oct 2026 · Hamilton County Board of ReviewCheck your own assessment
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How to file in Hamilton 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 Hamilton 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 Non-Farm Property Assessment Complaint Form | PTAX-230 | BOR complaint for non-farm property (hosted by the county; the Board lists it as a commonly used form) | |
| PTAX-227 Farm Property Assessment Complaint Form | PTAX-227 | BOR complaint for farm property (hosted by the county) | |
| 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 | Hamilton 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 Hamilton 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.
Hamilton County questions
When is the Hamilton County appeal deadline for 2027?
No 2027 date is published yet. The board’s rule: Board of Review rules (revised 01/30/2025): the deadline is always 30 calendar days after the assessment publication date for the tax year; complaints are filed at the Board's office on the prescribed form. If the Board proposes an increase, the owner has 10 days to file a complaint on it. The published 2025 notice gave a deadline of January 12, 2026.
How do I appeal my assessment in Hamilton County?
File the PTAX-230 Non-Farm Property Assessment Complaint Form with the Hamilton County Board of Review, c/o Supervisor of Assessments, 100 South Jackson Street, McLeansboro, IL 62859. Mailed complaints count as filed on the postmark date.
Should I talk to the assessor first?
Yes. The township assessor or the Hamilton County Supervisor of Assessments can fix record errors informally. Still file with the Hamilton 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 Hamilton County Supervisor of Assessments?
Mail: Hamilton County Board of Review, c/o Supervisor of Assessments, 100 South Jackson Street, McLeansboro, IL 62859. Phone: 618-643-3971. Hours and walk-in details: hamiltoncountyil.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
White County · Franklin County · Saline County · Wayne County · Jefferson County · Gallatin County · Williamson County
- Hamilton County Supervisor of Assessments
- Hamilton County Board of Review Rules & Procedures (PDF)
- Hamilton County Tax Year 2025 Publication (McLeansboro Gazette notice)
- PTAX-230 Non-Farm Property Assessment Complaint Form
- 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).