Appealing Your Assessment
NOTE: All 2026 Assessment Appeals for properties in our township must be filed with the DuPage County Board of Review by their deadline of October 26, 2026.
If you believe the value placed on your property is incorrect, you have the right to appeal it. Here is how the process works, what counts as evidence, and when to file.
Keep in mind that you are appealing the value of your property, not the tax on your property. Generally, assessment appeals focus on:
- the market value of a property, based either on a recent sale of the property or on recent sales of other similar properties; or
- the uniformity of a property’s assessment, based on the assessments of other similar properties.
Published in Addison and Carol Stream Suburban Life Newspapers.
The day after publication. Appeals must be filed with the DuPage County Board of Review.
The DuPage County Board of Review cannot accept a late filing.
You will be notified by the DuPage County Board of Review about your hearing date.
Also known as the "Quadrennial." Takes placce every four years. The previous General Reassessment Year was 2023.
The three steps
Take them in order. Most disagreements are settled at step one, without a formal appeal at all.
Start with this office
You can view information about your property and assessment using our web site's Property Search. You can also visit our office and review your property record card, as well as assessments and record cards for your neighboring properties to check for equity, and look at recent sales. If you still believe you are over-assessed, one our trained Deputy Assessor will go over your property record details and your assessment with you, and make any necessary corrections on the spot.
File an Appeal with the County Board of Review
If you disagree with our valuation, file an assessment appeal with the DuPage County Board of Review. You must be prepared to prove the market value of your property, or show that your valuation is higher than similar properties nearby. A hearing is scheduled, both sides present evidence, and you are notified of the decision in writing.
File an Appeal with the State Appeal Board
If you disagree with the Board of Review decision, you may appeal to the Illinois Property Tax Appeal Board. You submit evidence again, including photographs, sales contracts or appraisals. The Assessor and the Board of Review must also provide evidence. A decision is made on the weight of the evidence and sent to you in writing.
Filing an Effective Appeal
- A recent appraisal, a recent sale of the property, or recent "Arm's-Length" sales of similar properties can be a strong evidence of value.
- Note: An "Arm's-Length" sale is defined as a sale that is between unrelated parties, and that is between a willing buyer and a willing seller, and that was advertised for sale, and that involves no unusual concessions.
- Review your property characteristics at our office before you file. An error in your property record might be the whole problem, and we can correct it without an assessment appeal.
- Fair market value is not the highest or the lowest selling price of a property. It is the most probable one.
- When you compare against other properties, use genuinely comparable ones: same design, similar size, same neighborhood.
- You may have an attorney represent you at any stage. Attorneys are not required for Residential homeowners who appeal their own properties.
Where to file an appeal
Paper forms are no longer available from either agency. File your appeal directly with the body that is hearing it.
DuPage County Board of ReviewIllinois Property Tax Appeal Board