August 24th, 2026

2026 AVON Township Assessment Notices Will be arriving this week.

Haga “click” aqui para ver la informacion en Espanol

2026 Assessment notices will be mailed out this week for property owners in Avon Township. The assessment will also be published August 27th, 2026, in the Lake County Journal. The final filing date for assessment appeals in Avon Township is Monday, September 21st, 2026. Property owners that decide to appeal must do so electronically using the SmartFile E-Filing Portal. Property owners can appeal their assessment on their own through the Lake County Board of Review. Prior to filing a formal appeal to the Board of Review, property owners are encouraged to contact their Avon Township Assessor’s Office to discuss their concerns.

Appeal Process

The Lake County Board of Review has the authority to raise, lower or sustain property assessments as appears just. The typical appellant before the Board is a property owner who is dissatisfied with the assessment of their Lake County property in the Avon Township.

According to the Lake County Board of Review, before filing a formal appeal, property owners are strongly encouraged to contact the Avon Township Assessor’s Office. For two specific types of appeals—those based on a “Factual Error” (e.g., incorrect square footage, errors in property details) and “Vacancy” (for income-producing commercial properties)—the Board requires that the Assessor’s Office be contacted first. This preliminary contact often resolves issues without needing to proceed to a formal appeal.

Filing an Appeal

For the cases which cannot be settled at the Avon Township Assessor’s Office, the Board accepts appeals which meet criteria delineated here and discussed in Section III of the Board’s Rules: The appellant must have standing with the Board, must use and complete the prescribed forms of the Board, Board of Review Forms, attach required evidence and submit one copy in a timely fashion on or before thirty (30) days after the date of publication of current assessments for a particular township. It is important to follow the Board’s rules regarding the filing of an appeal. If the criteria is not met, the Board will not schedule a hearing for the case, the Board will not make a decision, and the appellant will have forfeited the right to further appeal the current assessment of a subject property. The Board of Review has a comprehensive online appeal filing application available for the filing of assessment appeals. Comparable sales and assessments can be researched through this application. The Lake County Comparable Property Grid is available in the application and can be uploaded to the Board of Review. The application can accept the upload of documents from recent sales transactions and ad valorem appraisal documents as well.

Appellants choose the basis of their appeals and the form of hearing they prefer.

Reasons to Appeal

The reasons for appeals are:

1. Factual Error – Property Characteristics (Contact Avon Township Assessor) This type of case involves questions on the accuracy of property characteristics used by the township assessor in the assessment process. The types of questions that might arise in this area are the actual living area of the home, number of bathrooms, size of the basement, total land area, etc. For additional information, see the Board’s Rules, Section IV A.

2. Recent Purchase of Property In this case you may have a 2025 or 2026 sale that you would like the Board of Review to consider as evidence of fair cash value for January 1, 2026. There are a series of required questions related to the transaction, along with the ability to upload sales documentation including the signed and completed Settlement Statement or the Closing Disclosures and Summaries of Transactions for the Board’s consideration. For additional information, see the Board’s Rules, Section IV B.

3. Recent Appraisal In this case, you have a real estate appraisal that you would like the Board of Review to consider as evidence based on ad valorem, meaning “according to value” for January 1, 2026. The appraisal must be uploaded. If your appraisal is yet to be completed, you will be reminded of the Board’s deadlines for your document. For additional information, see the Board’s Rules, Section IV C.

4. Recent Sales Comparables This case involves the submission of comparable properties that have recently sold using the Lake County Comparable Property Grid. Generally, the key metric in these cases is to compare the sale price per AGLA of the submitted comparables to the market value per AGLA of the subject property. Remember that the Board of Review will be looking for the best comparable sales evidence in determining the fair cash value as of January 1, 2026. In performing your comparable search, be sure to look for properties that are similar to yours. For additional information, see the Board’s Rules, Section IV C.

5. Equity of Assessment Comparables This case involves the submission of comparable properties using the Lake County Comparable Property Grid. Generally, the key metric in these cases is to compare the building assessment per AGLA of the subject to the building assessments per AGLA of the submitted comparables. In making their decision, the Board of Review will be considering the notable differences between the subject property and comparables so be sure to look for properties that are similar to yours. For additional information, see the Board’s Rules, Section IV D.

6. Matter of Law and Other This type of case generally involves legal issues. This selection allows you to upload a legal brief, or the option to paste text into the box provided. For additional information, see the Board’s Rules, Section IV E.

The type of evidence required by the Board for each basis or reason for an appeal is specified on the Appeal (application) Form and discussed in Section IV of the Board’s Rules.

Hearing Type

A hearing will be heard by the Board of Review, and the Appellant can decide to appear in person, by video (Zoom is preferred), or by telephone on the Appeal Hearing Date. If by letter, the Board decides the case on the basis of the written evidence submitted by the appellant and evidence submitted by Avon Township’s Assessor. The appeal by letter is the easiest form of appeal, because the appellant (and any representative and/or witness) does not need to be present. The Board will rely solely on the evidence presented by both parties. https://www.lakecountyil.gov/DocumentCenter/View/46781/2022-Determination-of-Need-for-IN-Person-Hearings

Aside from the above-mentioned, any well-prepared case based upon comparable properties can also be handled by the Board of Review without a hearing.

If the hearing is by phone, in-person or video the hearing begins with the swearing-in of parties to the case. Appellants and/or their attorney give evidence and testimony. Then the Avon Township Assessor will present their evidence and testimony. The Board and parties may ask questions. Parties to the case may provide rebuttal testimony. Board members deliberate between or among themselves and render their decision. Hearings are scheduled every fifteen (15) minutes.

Conclusion

The Appeal (application) Form, the Board’s Rules and this website are designed to be instructive. However, for those property owners who have additional questions or concerns, the Chief County Assessment Office has taxpayer advocates available each business day that can assist taxpayers with their assessment and appeal process questions.

Appeals Must Be Filed Electronically

Click here to watch video. 

Property owners can appeal their assessment through the Lake County Board of Review on their own. NO ATTORNEY is required for a residential appeal. The deadline date for each property is September 22, 2025, listed on the assessment notice.

Prior to filing a formal appeal to the Board of Review, property owners are encouraged to contact their Avon Township Assessor’s Office to discuss their concerns.

To file an appeal, all property owners need to begin the process using the Chief County Assessment Office’s SmartFile E-Filing Portal. For property owners in all but five of Lake County’s townships, the entire appeal process can be conducted through this portal. ·

Watch this video or view these printable instructions (PDF) to learn how to file an appeal online

· Begin filing an appeal online

· Learn how to use the Public Access Tool to research comparable properties and create a comparable grid that can be included in your appeal (PDF)

Board of Review Forms and Electronic Filings

• Rules of the Lake County Board of Review
• · Residential Appeal (Smartfile) 
• Commercial/Industrial Appeal (Smartfile) 
• Commercial Income/Expense Worksheet (PDF) 
• Board of Review Vacancy Affidavit (PDF) 
• Commercial/Industrial Comparison Grid (PDF)
• Attorney E-Filing Registration Form (Online Form)
• Request to Intervene in Appeal Proceeding (Smartfile)

Information disponible en Español en esta enlace

Avon Township Assessor’s Office is open to the public. We will assist Residents during

Normal Business Hours: Monday – Thursday 8:30am – 4:00pm & Friday 8:30am – 2pm.

Summer Hours:

Starting the Friday before Memorial Day – Labor Day: Monday – Thursday 8:30am – 4:00pm & Friday 8:30am – NOON. Ends the Friday before Labor Day

Avon Township – Assessor’s Office