If a Lake County assessment notice landed in your mailbox this month, it probably shows a bigger number than last year. Before you panic about the tax bill, or start bragging about your equity, know this: that notice is not your home's value. It's a formula. And you have a short window to push back on it.
The deadlines that are still open
Every township gets roughly 30 days from the day its assessment roll is published. Here's where the open windows stand, per the Lake County Board of Review's 2026 schedule:
Oct 5
Lake Villa Township
Lake Villa, Lindenhurst, Venetian Village, and parts of Ingleside and Round Lake Beach
Oct 5
Moraine Township
Highland Park and Highwood
Oct 19
Antioch Township
Antioch, Channel Lake, Lake Catherine, and the east side of Fox Lake
Nov 2
Shields Township
Lake Forest and Lake Bluff. Roll publishes Oct 1.
Closed
Grant Township
Most of Fox Lake and west Ingleside. The window closed Sept 14.
Township lines don't follow village lines, so check the township printed on your notice, not your mailing address. Vernon (Oct 26) and Newport (Oct 5) are also still open.
Why your number went up
Illinois law says your assessed value should equal one-third of your home's market value. Once a year, Lake County checks each township against actual sales and applies a multiplier to get everyone back to that one-third line.
For 2026, that multiplier is based on sales from 2023, 2024 and 2025, averaged together. Here's what it did in the townships above:
Township | 2026 multiplier | What it means |
|---|---|---|
Lake Villa | 1.0704 | about +7.0% |
Moraine | 1.0593 | about +5.9% |
Grant | 1.0578 | about +5.8% |
Antioch | 1.0559 | about +5.6% |
Shields | 1.0298 | about +3.0% |
That multiplier hits every home in the township the same way. Nobody walked through your house. Nobody looked at the roof you still need to replace, or the kitchen you redid last spring.
"Your assessment is an average wearing your address."
The reverse math every owner should do
Take the assessed value on your notice and multiply it by three. That's roughly what the county thinks your home was worth on January 1, 2026.
Example: notice shows an assessed value of
$110,000 × 3 = $330,000
That's the county's implied market value. Now compare it to what your home would sell for.
You'll land in one of two spots.
The county's number is higher than your real value
You may be paying more than your share. That's exactly what an appeal is for. Evidence beats opinion: recent comparable sales, an appraisal dated as close to January 1 as possible, or your closing documents if you bought recently.
The county's number is lower than your real value
Good news on taxes. But don't use that number to plan a sale. A three-year average lags the market, and on the Chain, one waterfront sale can move a street. Pricing off your tax notice is how people leave money on the table.
How to appeal without hiring anyone
The Board of Review says no attorney is required for a residential appeal. The steps:
1. Call your township assessor first. The county itself recommends it, and a mistake on your property record (wrong square footage, a bathroom you don't have) can sometimes be fixed without a hearing.
2. Pull three to five comparable sales. Similar size, age, and location, sold close to January 1, 2026. The county has a comparable grid form built for this.
3. File online through SmartFile before your township's deadline. Attach your evidence when you file.
4. Show up, call in, or let the paperwork speak. Hearings run about 15 minutes, and you can attend in person, by phone, or submit your evidence and let the Board decide.
Jimmy's Take
Here's what I'd do if it were my house. Do the times-three math tonight. If the county's number is clearly above what I could sell for, I'd pull comps and file, because it costs nothing but an evening. If it's close, I'd leave it alone. A few thousand dollars of assessed value isn't worth a fight.
And if you're thinking about selling in the next year, treat that notice as a starting point, not a price. I'll pull the actual recent sales on your street for free, and the same comps work for an appeal.
Questions I'm getting this week
Will a successful appeal lower my tax bill?
It lowers your assessed value, which lowers your share of the bill. Your actual bill also depends on what your schools, village and other taxing bodies levy, which an appeal doesn't change.
My township's deadline already passed. Now what?
For 2026, that window is closed. Keep your notice. It's useful context for next year's filing, and useful math if you're planning to sell.
Do I need an appraisal?
No. The Board calls an appraisal dated January 1 one of the best pieces of evidence, but comparable sales are enough for most homeowners.
I bought my house recently. Does that help?
It can. The Board accepts your closing statement or PTAX-203 transfer declaration as evidence, as long as the sale was on the open market.
Bottom line
Your assessment notice is a township-wide formula built on three years of old sales, not a verdict on your house. If the times-three number is too high, you have until your township's deadline to prove it, and you don't need a lawyer to do it. If it's too low, enjoy the tax break and don't price your home off it. Either way, the real answer is in the recent sales on your street.
What's your home really worth?
Get a real number based on actual recent sales, not a county formula. It's free, and it doubles as appeal ammo.
Own on the water? See what's selling now on Chain O'Lakes waterfront homes, or read the Antioch neighborhood guide.
Deadlines and multipliers are from the Lake County Board of Review's 2026 filing schedule and the county's equalization factors page, as of September 29, 2026. I'm a real estate broker, not a tax attorney. Confirm your deadline with your township assessor.
