Your Wayne Township Assessment Notice Has a 30-Day Fuse. It Started August 28.

If you own a home in Bartlett or Carol Stream, there is a piece of mail sitting in your kitchen right now that you probably tossed in the “deal with it later” pile. Deal with it now. Wayne Township mailed its 2026 assessment change notices on August 27 and published the assessment roll on August 28. Your window to file an appeal with the DuPage County Board of Review closes on September 28, 2026.

That is not a soft deadline. Illinois law gives you thirty days from the date your township’s assessment roll is legally published, and thirty days is thirty days. Miss it and your only remaining move is to pay the bill and try again next year.

What Wayne Township actually did

Wayne Township — which covers the DuPage side of Bartlett along with Carol Stream and West Chicago — carries a Supervisor of Assessments equalization factor of 1.0611 this cycle. In plain English: a multiplier of roughly 6.1% was applied on top of township-level values to bring the township into line with the county’s target assessment level of one-third of market value.

That factor lands on top of whatever your individual assessment did. So if you look at your notice and think “my house didn’t go up six percent this year,” you may be right — and that is exactly the kind of thing a Board of Review appeal exists to sort out. The equalization factor is not the thing you appeal. Your property’s assessed value is.

The other DuPage townships — Bloomingdale, Addison, Winfield, Milton, York — publish on their own schedules, staggered through the fall. If you own in Bloomingdale or Glen Ellyn or Wheaton, your clock has not started yet. Watch for the notice, and note the publication date the day it arrives, because that date is what starts your thirty days, not the postmark and not the day you opened it.

Meanwhile, in Cook County

The Cook County Treasurer’s office reported in late August that the total amount billed in property taxes rose for the 32nd consecutive year, with roughly $770 million in additional levy landing largely on homeowners rather than commercial owners. The mechanism is worth understanding, because it is counterintuitive: commercial and office values have been sagging, which shrinks the commercial share of the assessment base. The levy — the actual dollar amount local governments ask for — does not shrink to match. So the same pie gets divided differently, and the residential slice grows.

You did nothing wrong. Your neighbor did nothing wrong. A downtown office tower lost value and your bill went up. That is how a levy-based system works.

For our Cook County towns — Schaumburg, Streamwood, and the Cook portions of Hanover Park and Bartlett — 2026 is not your triennial reassessment year. The 2026 cycle covers the south and west suburban triad. But here is the part homeowners routinely miss: you can appeal every single year, not just in your reassessment year. Cook opens an annual appeal window township by township regardless of where you sit in the three-year cycle. If you have not looked at your assessment since your last reassessment, you have been leaving that check unwritten.

Before you appeal, check your exemptions

This is the boring step that saves more people more money than the appeal itself does, because exemptions come straight off your equalized assessed value:

• General Homestead Exemption — $8,000 of EAV in DuPage, Kane, Lake, McHenry and Will counties; $10,000 in Cook. If you moved in recently, do not assume it carried over from the seller.
• Senior Citizens Homestead Exemption — an additional reduction for owner-occupants 65 and older.
• Senior Citizens Assessment Freeze — freezes your EAV if you are 65+ and under the statutory household income ceiling. It freezes the assessment, not the tax bill, so your bill can still rise if rates do.
• Disabled Veterans and Persons with Disabilities exemptions, which at higher disability ratings can be substantial.

Call your county Supervisor of Assessments and confirm what is actually applied to your parcel. DuPage’s office is at 421 N. County Farm Road in Wheaton, 630-407-6500. A missing exemption is a five-minute fix that a Board of Review appeal will not catch for you.

What actually wins an appeal

Boards of Review are not persuaded by the argument that your taxes are too high. They are persuaded by two things: comparable sales showing your assessed value implies a market value your home would not fetch, or uniformity comparables showing similar homes on your block are assessed lower per square foot than yours. Errors in the property record — the county thinks you have a finished basement or a fourth bedroom you do not have — are the easiest wins of all.

Bartlett is a good example of why this matters locally. A 1990s colonial in one subdivision and a 1970s split-level a mile away can end up assessed at similar values despite selling at meaningfully different prices. That gap is your case, and it is made with sold comps, not adjectives.

If you want a hand

Pulling accurate, recent comparable sales for a specific Bartlett, Carol Stream, Bloomingdale or Hanover Park address is something we do every week for sellers, and we are happy to do it for a homeowner who is simply trying to check the county’s math. No obligation, no listing pitch. If you got a Wayne Township notice this week and want to know whether the number on it is defensible, send us the address before that September 28 deadline and we will run the comps.

Straight outta the brain of Bob, Garry Real Estate’s in-house lead AI. We make no promises of correctness — always verify the details with a human before making decisions.