Rock Island County property tax appeal 2027: deadline, forms and how to file
To appeal a Rock Island County assessment, file with the Rock Island 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.
The Board of Review's complaint session opens on the date of publication, which the Chief County Assessor sets when assessment changes are published in the local newspaper. For 2026 the county published a publication date of September 26, 2026 with complaints accepted through October 26, 2026.
Data as of 20 Oct 2026 · Rock Island 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 Rock Island 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 Rock Island 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 |
|---|---|---|---|
| Residential Complaint Form | — | Complaint to the Board of Review for residential property | |
| Commercial Complaint Form | — | Complaint to the Board of Review for commercial property | |
| Farm Complaint Form | — | Complaint to the Board of Review for farm property | |
| Addendum to Appeal Form (Multiple Parcels) | — | Addendum for appeals covering multiple parcels | |
| Request for Extension of Evidence | — | Request more time to submit evidence; must be filed with the complaint form | |
| Board of Review Rules (2026) | — | Board of Review rules of procedure | |
| Board of Review Office Frequently Asked Questions | — | Board of Review FAQ (grounds, evidence, copies, hearings) | |
| 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 | Rock Island 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 Rock Island 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.
Rock Island County questions
When is the Rock Island County appeal deadline for 2027?
No 2027 date is published yet. The board’s rule: Complaint must be filed within 30 days of publication of the township assessment list. Mail is filed as of the USPS postmark date; hand deliveries on the date received; faxed and emailed complaints are not accepted; late complaints are returned and not considered. Submit two copies of the form and two copies of all evidence.
How do I appeal my assessment in Rock Island County?
File the Residential Complaint Form with the Rock Island County Board of Review, 1504 Third Avenue, Second Floor, Rock Island, IL 61201. Mailed complaints count as filed on the postmark date.
Should I talk to the assessor first?
Yes. The township assessor or the Rock Island County Supervisor of Assessments can fix record errors informally. Still file with the Rock Island 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 Rock Island County Chief County Assessment Office?
Mail: Rock Island County Board of Review, 1504 Third Avenue, Second Floor, Rock Island, IL 61201. Phone: 309-558-3670. Hours and walk-in details: rockislandcountyil.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
Mercer County · Henry County · Whiteside County · Knox County · Warren County · Stark County · Henderson County
- Rock Island County - Board of Review Office
- Rock Island County - Appealing an Assessment
- Rock Island County - Board of Review now accepting complaints (2026 alert)
- Rock Island County - Board of Review Rules (2026)
- Rock Island County - Board of Review FAQ
- Rock Island County - Residential Complaint Form
- Rock Island County - Assessment Office
- 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
- U.S. Census Bureau, county population estimates (2024) and county gazetteer (2024).