Peoria County's formal assessment challenge is a written complaint to the Peoria County Board of Review. The county uses township-specific schedules and bundles the applicable schedule, rules, and complaint form in its complaint packets. As of July 16, 2026, the Board page stated that the 2026 appeals-by-township schedule was coming in fall, so there is no verified countywide closing date to publish now. A homeowner can prepare the property record and evidence before the window opens, then use the packet tied to the subject township. FairPath can help organize a manual source record and filing checklist. It does not submit the complaint, create a Board case, attend a hearing, or claim a live Peoria automation path.
Assessment context: Peoria County's township assessors establish local assessments, and the Board reviews formal complaints after the assessment books move into its process. Review the official parcel record for township, property class, assessed land and building values, lot, living area, year built, construction, basement, garage, additions, and condition. Illinois assessment appeals concern assessed value, not the tax rate or tax bill. Peoria County contains older city neighborhoods, river and bluff locations, established suburbs, small towns, agricultural edges, and properties affected by different market and site influences. Comparable selection should reflect that geography and the subject's actual use. Keep market-value evidence separate from an assessment-uniformity comparison and from a request to correct an inaccurate property characteristic.
Filing process: Peoria advises owners to discuss the assessment with the township assessor and to become familiar with the Board's hearing rules before filing. Once 2026 packets are available, select the packet and schedule for the correct township, read the current rules, complete the assessment complaint form, state the relief requested, and include the evidence the packet requires. Do not assume that calling an assessor, downloading a form, or beginning a draft preserves the deadline. Submit through a method the current county instructions authorize and retain a receipt or delivery record. Follow the hearing notice for exhibit copies, attendance, remote or in-person procedure, and any supplemental deadline. If the local result is challenged further, Illinois provides a separate Property Tax Appeal Board route with different forms and timing; this page does not automate that appeal.
Evidence to review: A Peoria homeowner should build a comparison table that can be checked against official records. Market evidence should identify arm's-length sales near the relevant valuation date and explain similarity in neighborhood, property type, size, age, lot, basement, garage, renovation, and condition. Uniformity evidence should compare current assessed values of similar properties within an appropriate assessment area, not mix assessed values with sale prices without explanation. Dated interior and exterior photographs, inspection findings, permits, contractor proposals, and repair documentation can establish the physical condition that existed on the valuation date. Label every exhibit with the subject parcel and a short relevance note. Because the county's complaint packet controls the filing, reconcile the final evidence index to the packet's instructions and preserve the exact version submitted.
Current deadline guidance: Township-specific 2026 filing schedule expected in fall 2026. Peoria County publishes Board of Review appeal periods by township after assessment publication. The official Board page said the 2026 township appeal schedule was coming in fall 2026 when reviewed July 16. Owners must use the schedule included with the current complaint packet for the subject township and must not rely on a prior-year date.
Peoria publishes appeal schedules by township, and its official page had not yet released the 2026 township dates as of July 16.
Each county complaint packet includes the rules, complaint form, and schedule applicable to the property, making packet selection a substantive filing step.
Peoria's city, bluff, river, suburban, small-town, and rural settings make broad ZIP-code comparisons unreliable without location analysis.
Contact with the township assessor may resolve a factual error but does not replace a timely Board complaint.
Official filing authority: Peoria County Board of Review. https://www.peoriacounty.gov/507/Assessment-Complaints
Source: Peoria County Government, Peoria County Board of Review, https://www.peoriacounty.gov/686/Board-of-Review. Reviewed 2026-07-16.
Source: Peoria County Government, Assessment Complaints and County Packets, https://www.peoriacounty.gov/507/Assessment-Complaints. Reviewed 2026-07-16.
Source: Peoria County Government, Peoria County Submission Resources, https://www.peoriacounty.gov/146/Submit. Reviewed 2026-07-16.
Source: Illinois Department of Revenue, Assessment Appeals - Property Tax, https://tax.illinois.gov/localgovernments/property/appeals.html. Reviewed 2026-07-16.