A Will County owner who disputes a 2026 assessment may file a complaint with the Will County Board of Review during the published August 12 through September 14 window. The Board accepts electronic portal submissions and mailed complaints. The formal filing must use the current county form and include the evidence required by the 2026 rules; a conversation with the township assessor does not preserve the Board deadline. FairPath can help an owner manually inventory the township property card, photographs, comparable records, written argument, and filing proof. It does not submit through the Will County portal, mail documents, provide representation, or claim automated county valuation or packet production.
Assessment context: Will County township assessors maintain the local property record and assessment, while the Supervisor of Assessments supports publication and the Board of Review complaint process. The Board identifies four common bases: overvaluation, inequity, discrepancy in physical data, and eligibility for a preferential assessment. A higher tax bill, a changed tax rate, or a percentage increase alone is not one of those bases. The owner should begin with the correct PIN, township, current assessment, property record card, and requested assessment. Will County's 2026 rules are unusually specific about evidence format, current-year photographs, township-issued property cards, written explanations, and submission timing, so a generic set of online estimates is not a substitute for the county checklist.
Filing process: Before the window opens, contact the local township assessor and obtain the front and back of the current township property record card. Download the 2026 complaint form and instructions from the official downloads page. For electronic filing, register in the Board portal, complete and sign the current form, upload it with all evidence at once, and keep the portal confirmation. For paper filing, mail the complaint and evidence to the Supervisor of Assessments Office at the official Joliet address; fax and email are not accepted. The portal was still closed on July 15 and states it will open August 12. Do not treat a saved portal draft as filed, and do not wait until September 14 to resolve missing signatures, trust documentation, parcel addenda, or authorization issues.
Evidence to review: For a residential complaint, the 2026 rules require camera-dated photographs taken in the filing year: front and back views of the subject and a front view of every comparable. They also require the front and back of the property record card obtained from the local township assessor and a written brief explaining the factual reason for the complaint. For overvaluation or equity, provide at least three comparables with the original filing. Prefer properties near the subject or in the same subdivision and township, then compare size, construction, quality, age, style, condition, and relevant market or assessment data. A discrepancy claim should identify the incorrect property-card field and include competent proof such as a survey, photograph, or construction document. Except for a limited commercial or industrial appraisal rule, evidence is expected at filing.
Current deadline guidance: August 12 through September 14, 2026; portal not yet open as of July 15. The Will County Board of Review states that it will accept 2026 assessment complaints from Wednesday, August 12, 2026 through Monday, September 14, 2026. The official portal displayed this future window but was not accepting new submissions when reviewed July 15, 2026. The Board's 2026 rules describe the statutory deadline as 30 calendar days after publication of the current assessment list. File no later than September 14 using the current official form and route, and recheck the portal immediately before submission for any operational notice.
Will County has announced a fixed 2026 intake window: August 12 through September 14. As of July 15, the official portal showed those dates but remained closed to new submissions. Owners can prepare the form and evidence in advance but must return during the live window and obtain actual submission or mailing proof.
The residential photograph rule is concrete. Submit camera-dated front and back images of the subject taken in 2026 and a camera-dated front image for each comparable. Reused listing images or undated repair photographs may not satisfy the stated requirement, even if they are visually relevant.
Will County distinguishes township property record cards from county-level records for this filing. The 2026 rules require the front and back of the card obtained from the local township assessor, although a current card from the township assessor's website can qualify. Confirm that the data is current before relying on it.
Evidence and a written argument should accompany the complaint. The rules provide a short no-evidence hearing when nothing is filed and generally require residential evidence at the initial submission. Organize the requested assessment, selected comparables, current photographs, property card, and concise factual explanation as one coherent filing rather than planning to add the case later.
Official filing authority: Will County Board of Review. https://borappeals.willcountysoa.com/Home
Source: Will County Supervisor of Assessments, Will County Board of Review Complaint FAQ, https://borcomplaints.willcountysoa.com/FAQ. Reviewed 2026-07-15.
Source: Will County Supervisor of Assessments, Board of Review Complaint Portal, https://borappeals.willcountysoa.com/Home. Reviewed 2026-07-15.
Source: Will County Board of Review, 2026 Board of Review Rules and Procedures, https://willcountysoa.com/Content/pdf/2026_BORRulesAndProcedures.pdf. Reviewed 2026-07-15.
Source: Will County Supervisor of Assessments, Board of Review Complaint Downloads, https://borappeals.willcountysoa.com/downloads.aspx. Reviewed 2026-07-15.