Sellers think property taxes are the buyer’s problem. You are leaving, they are the ones getting the bill.
That is backwards. Your tax rate helps decide what your house sells for, and it does so before a single buyer walks through the door.
Here is how that works, why two houses five minutes apart can carry very different tax burdens, and what any of it has to do with your sale price.
How an Illinois tax bill is actually built
Almost nobody in Illinois can explain their own property tax bill, which is understandable, because it involves four moving parts.
Part one: market value. What your home is worth.
Part two: assessed value. Illinois statute requires property outside Cook County to be assessed at 33.33% of market value. A home worth $400,000 carries an assessed value near $133,320. This is where most confusion starts, because people see the assessment, think their house has been undervalued by two thirds, and get upset about the wrong thing.
Part three: the composite rate. This is the sum of every taxing body that overlaps your parcel. Your school district, your municipality, the county, the township, the road district, the park district, the library, the fire protection district, the community college, the forest preserve. Each one sets its own rate, and they stack.
Part four: exemptions. The general homestead exemption reduces taxable value for owner occupants. Additional exemptions exist for seniors, veterans, disabled persons, and recent home improvements.
Multiply assessed value by the composite rate, subtract what exemptions do, and you have your bill.
The school district is most of your bill
Here is the part with real consequences for sellers.
Look at the actual numbers. These are the school district rates for Kane County, tax year 2024 payable 2025, from the County Clerk.
| School district | Rate |
|---|---|
| Dundee 300 | 4.692833% |
| Huntley 158 | 4.720915% |
| St. Charles 303 | 4.846578% |
| Barrington 220 | 4.848603% |
| Elgin U46 | 5.114652% |
| Batavia 101 | 5.256061% |
| Geneva 304 | 5.374060% |
| Central 301 | 5.893253% |
| Kaneland 302 | 5.906586% |
Now compare that to what the municipalities charge.
| Municipality | Rate |
|---|---|
| Pingree Grove | 0.187976% |
| North Aurora | 0.366274% |
| Elburn | 0.406983% |
| Gilberts | 0.468873% |
| Geneva | 0.478664% |
| South Elgin | 0.550956% |
| Bartlett | 0.708948% |
| St. Charles | 0.734247% |
| Batavia | 0.760023% |
| Carpentersville | 1.290544% |
| Elgin | 1.447507% |
| Aurora | 1.573666% |
The school district is running four to six percentage points. The municipality is running a fraction of one. Kane County itself takes 0.287842% and the forest preserve takes 0.146808%.
Which means your tax rate is mostly a function of which school district you sit in, not which town you live in.
That distinction matters enormously around here, because municipal borders and school district boundaries do not line up. Parts of one town feed into different districts. Homes with the same mailing address town can sit in different districts with different rates. Unincorporated parcels between towns follow their own combination of taxing bodies entirely.
So two houses that look like neighbors, priced the same, listed the same week, can hand their buyers noticeably different tax bills. Buyers who are paying attention notice. Buyers working with a good lender notice immediately, because it changes their approval.
What a rate difference does to your buyer
This is the mechanism sellers miss, so it is worth walking through slowly.
Buyers do not shop for a purchase price. They shop for a monthly payment. Their lender adds up principal, interest, taxes, and insurance, and that total has to fit inside what they qualify for.
Property taxes sit inside that monthly number. A higher tax bill eats payment capacity that would otherwise have gone toward the loan.
Take a $400,000 home, assessed at 33.33% of value, so about $133,320. Every single percentage point of composite tax rate costs that owner $1,333 a year, or about $111 a month.
Now flip it into purchasing power. Freddie Mac put the average 30-year fixed rate at 6.58% in late July 2026. At that rate, every $1,000 borrowed costs roughly $6.37 a month. So $111 of monthly payment supports about $17,400 of mortgage principal.
Read that again, because it is the whole point of this post. One percentage point of tax rate difference means the buyer looking at your house can afford roughly $17,400 less house than an identical buyer looking somewhere with a lower rate. Same income. Same down payment. Same approval.
That gap does not come out of the buyer’s pocket. It comes out of your sale price.
The Tri-Cities example
Put real numbers on it.
St. Charles District 303 sits at 4.846578%. Geneva District 304 sits at 5.374060%. That is a gap of about 0.53 percentage points, from the school district alone, between two towns that share a river and a reputation.
On that same $400,000 home, the difference is roughly $703 a year, or about $59 a month. At current rates, $59 a month is close to $9,200 of borrowing power.
Nine thousand dollars of buyer budget, created by a boundary line, before anyone has discussed your kitchen.
This cuts both ways, and it is worth being straight about it. St. Charles carries the lowest school rate of the three Tri-Cities, which is a quiet advantage for sellers there. Geneva carries the highest, and Geneva sellers are usually competing on other strengths.
Why your bill went up when the rate went down
A quick detour, because this confuses homeowners every single year.
Illinois taxing districts do not set a rate and collect whatever it produces. They set a levy, which is a dollar amount they intend to raise. The rate is calculated afterward by dividing that levy across the total assessed value in the district.
So when property values across a district rise, the same levy spreads across a larger base, and the rate falls. Your rate can go down while your bill goes up, because your individual assessment climbed faster than the district average.
You can see this in the county’s own data. Elgin U46 came down from 5.461836% to 5.114652% between the 2023 and 2024 tax years. Batavia 101 came down from 5.863561% to 5.256061%. Falling rates, in a period when most homeowners in those districts did not experience a falling bill.
Kane County also operates under the state’s tax cap law, which limits how much most districts can increase their extension year over year. The cap slows growth. It does not freeze bills.
None of this is a conspiracy. It is arithmetic that runs in an order most people would not guess.
How to find your own exact rate
The tables above give you the two biggest pieces. Your full composite rate depends on your specific parcel, because it includes your township, road district, park district, library, fire district, and any special service area that covers your subdivision.
Two ways to get the real number. Look at your most recent tax bill, which itemizes every district and shows the composite. Or search your parcel in the Kane County property tax inquiry system through the County Treasurer. Either takes about two minutes and beats guessing.
One thing worth knowing while you are in there: Illinois requires a general reassessment every four years, and assessors are required to analyze actual sales from the three years before the assessment date rather than reacting to the current month. If your assessment looks out of line with comparable homes, it can be appealed through the county, but there is a filing window and a process. That is a project to start well before you list.
What sellers should actually do with this
Four practical moves.
Know your composite rate and your district before you price. Not your monthly escrow payment, the actual rate and the actual annual bill. If you are in a higher-rate district, that is a real headwind on your price, and pretending otherwise leads to a listing that sits.
Get the district right in your marketing. If you are in the stronger or lower-rate district for your area, name it, because buyers filter on it. If your town spans multiple districts, do not leave buyers guessing, because a wrong assumption either costs you a showing or blows up later.
Check your exemptions before listing. If you have been claiming an exemption a buyer will not receive, their bill will be higher than yours. Their attorney will find this during review and use it to push for a larger tax proration credit at closing. That credit is already one of the biggest surprises on a seller’s settlement statement, and we broke down how it is calculated separately.
Factor it into the buy side too. The same monthly payment reaches less house where the rate is higher. Running both calculations together changes which towns are genuinely on your list.
The bigger picture for move-up sellers
Most of the families we work with are selling a starter home in South Elgin or Elgin and buying something larger in the St. Charles, Geneva, or Batavia corridor.
For that family, tax rates work on both ends. The rate on your current home shapes what you can sell it for. The rate in the town you are moving to shapes how much house your budget will actually reach. Sometimes a town that looked out of reach is closer than expected, and sometimes the reverse.
Our area pages cover what the towns in this market are like, and the market reports track what is happening with prices in each of them. The rest of our seller guide walks through pricing.
If you want your specific rate, your district, and what both mean for your number, reach out and we will pull it for your parcel.
Rates shown are for tax year 2024, payable 2025, per the Kane County Clerk. Rates change annually. Confirm current figures with the Kane County Clerk and the Supervisor of Assessments. This post is general information, not tax or legal advice.
