Peoria County property tax appeal 2027: deadline, forms and how to file
To appeal a Peoria County assessment, file with the Peoria County Board of Review of Assessments 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.
2026 cycle: assessment-change notices mailed Aug 24, 2026 and changes published Aug 26-27, 2026 (Journal Star or the township's local paper); the county posts a township-by-township filing schedule each year.
Data as of 20 Oct 2026 · Peoria County Board of Review of AssessmentsCheck 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 Peoria 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 Peoria County Board of Review of Assessments 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 Residential Assessment Complaint Packet | — | Complaint form, comparable sales/equity grid and owner-authorization form for residential property (2026 version) | |
| 2026 Farmland Assessment Complaint Packet | — | Complaint packet for farmland (2026 version) | |
| 2026 Duplex Assessment Complaint Packet | — | Complaint packet for duplexes (2026 version) | |
| 2026 Commercial Assessment Complaint Packet | — | Complaint packet for commercial property (2026 version) | |
| 2026 Industrial Assessment Complaint Packet | — | Complaint packet for industrial property (2026 version) | |
| 2026 Board of Review Rules | — | Rules governing the appeal process before the Board of Review | |
| 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 | Peoria County Board of Review of Assessments | 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 Peoria 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.
Peoria County questions
When is the Peoria County appeal deadline for 2027?
No 2027 date is published yet. The board’s rule: Complaints are accepted each year from June 1 until 30 days after the township's assessment changes are published in the newspaper; the county posts a filing schedule with each township's deadline (2026: Board of Review filing deadline Sep 30, 2026 for all 20 townships). The 30 days is not extended for talking to the township assessor; if a deadline falls on a weekend it moves to the next business day. Mailed complaints are filed on the USPS postmark date; hand deliveries on the date received. Electronic mail and fax filings are not accepted. If more time is needed for an appraisal or other evidence, it must be submitted within 30 calendar days after the filing deadline.
How do I appeal my assessment in Peoria County?
File the 2026 Residential Assessment Complaint Packet with the Peoria County Board of Review of Assessments, Board of Review of Assessments, Peoria County Courthouse, 324 Main Street, Room 301, Peoria, IL 61602. Mailed complaints count as filed on the postmark date.
Should I talk to the assessor first?
Yes. The township assessor or the Peoria County Supervisor of Assessments can fix record errors informally. Still file with the Peoria County Board of Review of Assessments 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 Peoria County Supervisor of Assessments?
Mail: Board of Review of Assessments, Peoria County Courthouse, 324 Main Street, Room 301, Peoria, IL 61602. Phone: (309) 672-6022. Hours and walk-in details: peoriacounty.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
Stark County · Tazewell County · Knox County · Marshall County · Woodford County · Fulton County · Putnam County
- Peoria County - Assessment Complaints
- Peoria County - Board of Review
- Peoria County - Supervisor of Assessments
- Peoria County - Forms & Documents
- Peoria County - Assessment Publications and Notices
- 2026 Board of Review filing schedule (PDF)
- 2026 Board of Review Rules (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).