Iroquois County property tax appeal 2027: deadline, forms and how to file
To appeal an Iroquois County assessment, file with the Iroquois County Board of Review by mail or 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 changes are published once for the whole county in the fall; the 2025 assessments were published November 20, 2025 in local newspapers (CP News, The Advocate, Times Republic) for all townships. The Board accepts complaints only after publication.
Data as of 20 Oct 2026 · Iroquois 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.
By checking an address you agree to the Terms and Privacy Policy. We keep an address only if you add it to a dashboard; we never sell it.
How to file in Iroquois County
- Step 1
File the appeal
Use the method your notice lists, 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 Iroquois 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 |
|---|---|---|---|
| 2026 Assessment Appeal Form (BOR Complaint Form) | — | Assessment complaint to the Board of Review; one form per parcel | |
| 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 | Iroquois 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 Iroquois 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.
Iroquois County questions
When is the Iroquois County appeal deadline for 2027?
No 2027 date is published yet. The board’s rule: Per the 2026 Board rules, complaints are due on or before 30 days after the publication date of the assessments, and the deadline for each township is posted on the Board of Review webpage (for the 2025 assessments: published November 20, 2025, final appeal date December 22, 2025, same for all townships). Mail is filed as of its US Postal Service postmark; other carriers (FedEx, UPS) and fax or email do not count as timely filing.
How do I appeal my assessment in Iroquois County?
File the 2026 Assessment Appeal Form (BOR Complaint Form) with the Iroquois County Board of Review, 1001 E. Grant St., Room 106, Watseka, IL 60970. Mailed complaints count as filed on the postmark date.
Should I talk to the assessor first?
Yes. The township assessor or the Iroquois County Supervisor of Assessments can fix record errors informally. Still file with the Iroquois 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 Iroquois County Supervisor of Assessments?
Mail: Iroquois County Board of Review, 1001 E. Grant St., Room 106, Watseka, IL 60970. Phone: 815-432-6978. Hours and walk-in details: iroquoiscountyil.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
Ford County · Kankakee County · Livingston County · Vermilion County · Champaign County · Grundy County · Will County
- Iroquois County Board of Review
- Iroquois County 2026 Board of Review Rules and Procedures (PDF)
- Iroquois County 2025 Publication and Appeal Deadline Dates (PDF)
- Iroquois County 2026 Assessment Appeal Form (PDF)
- Illinois State Board of Elections County Officers directory
- 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
- needs_verification: assessingOfficeUrl: the county homepage is used because no dedicated Supervisor of Assessments page was found
- U.S. Census Bureau, county population estimates (2024) and county gazetteer (2024).