Home / Lake County / Your assessment notice
Your Lake County assessment notice isn't a tax bill. It's basically your township assessor telling you what they think your home's worth, and from the day your township's values are published in the newspaper you've got 30 days to disagree. Here's what the numbers mean, how they turn into your bill, and how to tell whether an appeal could actually work.
Your home's details. Check the square footage, the age, and anything else the county's got on file. A house recorded as bigger than it really is gets valued too high, and that's honestly the easiest kind of appeal there is. You can see everything the county holds on your home, including a sketch and its sales history, for free at tax.lakecountyil.gov.
The value. Outside Cook County, Illinois law sets a home's assessed value at one third of its market value. That means a home worth $350,000 should carry an assessed value of about $116,667. Multiply the assessed value on your notice by three and you've pretty much got what the county thinks your home would sell for. If that's well above what it'd really sell for, it's worth a closer look.
Finally, the date to file. It's printed on your notice. It falls 30 days after your township's values were published in the local newspaper, so it's the same for everyone in your township, but it's a different date in each one.
Here's how it works for a $350,000 home in Vernon Township, using the county's own numbers. Your real rate's printed on your last tax bill.
| Step | Example |
|---|---|
| Assessed value, which is one third of market value | $116,667 |
| Times your township's multiplier. The county sets one for each township every year to bring it to one third of market value, and Vernon's for 2026 is 1.0396 | $121,287 |
| Minus your exemptions. The general homestead exemption takes off $8,000 | $113,287 |
| Times your local tax rate. Half of Lake County's taxable value sits in areas with a 2025 rate above 8.39 percent, and that's the rate used here | $9,508 a year |
So a higher value on your notice doesn't really raise your bill by the same percentage. Every school district, village and park district that taxes your home sets its own rate based on how much money it's asking for, and if values went up across the board, the rates usually come down. What actually costs you money is your value going up more than your neighbors' did.
Say that $350,000 home wins a 10 percent cut in its assessed value. That's $11,667 off, which works out to about $1,018 a year at the same rate.
But honestly, most homes don't have a case. We compared 137,775 Lake County houses against genuinely similar homes in their own assessment neighborhood, and only 8,233 of them, about 6 in every 100, were assessed higher per square foot than every one of those neighbors. For most people the honest answer is that their assessment's basically in line.
Now Illinois decides most home appeals on fairness between neighbors, which the law calls uniformity. When we read 41 residential decisions from the Illinois Property Tax Appeal Board, 29 of them came down to whether homes genuinely like the owner's, nearby, were assessed lower per square foot. Only 6 even mentioned comparable sales.
So the real question is whether your assessment per square foot of building sits above the range for similar homes in your neighborhood. If it does, you've got the kind of case boards grant. If you're inside that range or below it, the Board of Review's probably going to look at the same numbers and change nothing.
And that's exactly what our free check does. It reads Lake County's own parcel records, finds homes like yours in your assessment neighborhood, runs that per square foot comparison, and tells you which side of the line you're on. Most people who use it get told not to bother, and we'd rather you heard that before you spent an afternoon on it.
Check my Lake County home, free
Fortunately it's free and you can do it yourself. The county says you don't need an attorney for a home appeal, and it suggests calling your township assessor first, because they can sometimes fix a mistake without a formal appeal.
Then if you do file, it's done online at the Board of Review through the county's SmartFile portal at assessor.lakecountyil.gov. Cuba, Ela, Grant, Libertyville, Shields and Vernon townships use different software, so their appeals start in SmartFile but they've got separate instructions that the county posts. The county's also got a free tool for looking up comparable homes and building a comparison grid to attach to your appeal.
When we checked on October 7, 2026, 3 townships were still open: Antioch until 10/19/2026, Vernon until 10/26/2026, Shields until 11/2/2026. The rest had already closed for 2026. Your township is printed on your notice.
| Township | Values published | Last day to file |
|---|---|---|
| Shields | 10/1/2026 | 11/2/2026 (open) |
| Vernon | 9/24/2026 | 10/26/2026 (open) |
| Antioch | 9/17/2026 | 10/19/2026 (open) |
| Lake Villa | 9/3/2026 | 10/5/2026 |
| Moraine | 9/3/2026 | 10/5/2026 |
| Newport | 9/3/2026 | 10/5/2026 |
| Avon | 8/27/2026 | 9/28/2026 |
| Fremont | 8/27/2026 | 9/28/2026 |
| Cuba | 8/20/2026 | 9/21/2026 |
| Libertyville | 8/20/2026 | 9/21/2026 |
| Grant | 8/13/2026 | 9/14/2026 |
| Wauconda | 8/13/2026 | 9/14/2026 |
| West Deerfield | 8/13/2026 | 9/14/2026 |
| Zion | 8/13/2026 | 9/14/2026 |
| Warren | 8/6/2026 | 9/8/2026 |
| Waukegan | 8/6/2026 | 9/8/2026 |
| Benton | 7/23/2026 | 8/24/2026 |
| Ela | 7/23/2026 | 8/24/2026 |
Also, if you miss your township's window, the Board of Review can't take your appeal for this year. You'll get your next chance when your township's values are published again next year.
Basically, exemptions take money off your bill with no appeal at all. At the rate in the example, each $8,000 exemption is worth about $671 a year.
And you apply for all of them through the same SmartFile portal, or your township assessor's office can help you.
The deadlines, the filing process and the advice to call your township assessor come from the Lake County Chief County Assessment Office's assessment notices page. The multipliers come from its equalization factors page, and Vernon's 1.0396 is the 2026 tentative figure. The exemption amounts and the senior freeze limits come from the county's tax relief pages. The one third assessment level is 35 ILCS 200/9-145.
Our tax rate comes from the Lake County Clerk's 2025 rates by tax code, covering 912 tax codes. Weighted by taxable value, the middle rate is 8.39 percent, and half of all taxable value sits between 7.37 and 9.16 percent. The comparison of 137,775 houses is our own, from Lake County's published parcel records, matching each home only against similar homes in the same assessment neighborhood. The 41 decisions are from the Illinois Property Tax Appeal Board, and the uniformity rule is 86 Illinois Administrative Code 1910.63(e).
If you spot an error, please write to hello@propertytaxbuddy.com and we'll correct it and say what changed.