If two Bartlett homes on your shortlist sit a mile apart, which property tax bill should you trust? Start with the due dates. On the DuPage and Kane sides of the village, the last 2026 installment came due September 1. On the Cook side, the second installment for tax year 2025 came due October 1, 2026, while the matching installment the year before didn't come due until December 15, 2025. The Cook County Assessor said the values from Hanover Township's 2025 reassessment would show up on 2026 tax bills. So a Bartlett listing you tour this week may show a recent tax figure that means something different depending on which side of Devon Avenue the house sits.
All three county sides of Bartlett got a lower tax rate for 2025. The rate is the wrong number to compare. It fell because property values rose, and in the Cook County part of the village the 2025 reassessment shifted more of the tax load onto homes.
Find the county line before you read the bill
The Village of Bartlett describes the split this way. Most homes north of Devon Avenue and east of Route 25 are in Cook County. The exception is Bartlett Pointe West, which is in Kane County. Homes south of Devon Avenue and east of Route 25 are in DuPage County. On the Cook side the township is Hanover. On the DuPage side it's Wayne. In Kane County, the Clerk's tax code EL014 combines Elgin Township with Bartlett Village and the Bartlett Park District.
Each county runs its own calendar. For tax year 2025, paid in 2026, the dates looked like this:
- DuPage: bills mailed April 29, 2026, with installments due June 1 and September 1, 2026.
- Kane: bills mailed by May 1, 2026, with the same June 1 and September 1 due dates.
- Cook: first installment due April 1, 2026, and second installment due October 1, 2026. The year before, the tax year 2024 second installment came due December 15, 2025. In an August 18, 2026 announcement, Cook County officials said the prior year's two-month delay came from a technology overhaul that affected tax processes and timelines.
For a Cook-side Bartlett home, the bill that came due this October is the one to ask the seller for.
Every side of Bartlett got a lower rate
These are the official composite rates for tax year 2025 next to the prior year. Each county clerk publishes them per $100 of equalized assessed value.
| Bartlett area | Rate source | 2024 rate | 2025 rate |
|---|---|---|---|
| Cook side, Hanover Township | Cook Clerk, village average per PIN | 10.542173 | 8.763757 |
| DuPage side, Wayne Township | DuPage Clerk, tax code 1036 | 8.0853 | 7.6273 |
| Kane side, Elgin Township | Kane Clerk, tax code EL014 | 8.397321 | 7.883768 |
The Cook County Clerk's 2025 tax rate report, released September 23, 2026, puts the drop in Bartlett's average Cook-side rate at 16.87%. The Clerk also notes that each property's rate can be higher or lower than that average, depending on which taxing districts serve it.
Reading across a row of that table is also misleading. Cook County assesses single-family homes and condos at 10% of market value and then applies a state equalizer, which Illinois set at 3.0300 for 2025. Kane assesses most non-farm property at 33.33% of fair cash value. Kane also applies township equalization factors meant to hold assessments at that level. Elgin Township's final factor for 2025 was 1.0857. A Cook rate and a Kane rate are applied to two differently built tax bases, so the gap between them says little about which house costs more to own.
A falling rate is what rising values look like
A tax rate is what you get when the amount taxing bodies levy is spread across the total assessed value. When values grow faster than levies, the rate drops, and the total collected can still go up.
DuPage County spells out that math on the first page of its 2025 rate booklet. Average assessed value rose 8.2%. The average tax rate fell 4.37%. The average tax bill went up 3.83%. DuPage Treasurer Gwen Henry's office adds that bills vary by property and location and that there is no "average" bill. On the DuPage side of Bartlett, the rate fell from 8.0853 to 7.6273, about 5.7%. A home whose assessment climbed faster than the rate fell still got a bigger bill.
North of Devon, homes picked up a bigger share
The Cook side carries the bigger version of this effect, because the Assessor reassessed Hanover Township in 2025. Notices went out November 6, 2025. The Assessor said those estimated market values would show up on 2026 tax bills. For single-family homes across Hanover Township, the Assessor's 2025 median estimate was $312,000, compared with a 2024 median sale price of $327,000. For condos it was $259,000, compared with a $270,000 median sale price.
When a reassessment raises home values faster than business values, homes end up carrying a larger share of what taxing bodies levy. The Cook County Treasurer's tax year 2025 analysis, published in August 2026, covers suburban Cook County north of North Avenue, which takes in Bartlett's Cook side:
- Total taxes rose 6.4%. Residential taxes rose 9.9%, and business property taxes rose 0.2%.
- More than 309,000 homeowners saw their taxes go up, and nearly 100,000 saw them go down.
- Residential values grew much faster than business values, so homeowners took on 2% more of the region's overall tax burden.
- The median homeowner bill rose 6.7% to $8,007. The median commercial bill fell 3.5% to $28,253.
These are regional figures, not a Bartlett median. The same report shows the median residential assessed value next door in Streamwood rising from $23,000 for 2024 to $28,906 for 2025, an increase of 25.68%. The Daily Herald covered the Treasurer's findings in August, under the headline that most Cook County homeowners would see their taxes rise again.
So the 16.87% drop in Bartlett's average Cook-side rate and a higher bill for a typical house can both be true. The rate came down because the tax base grew, and homes made up more of that growth.
Where a Cook-side Bartlett tax dollar goes
The Clerk's report lists the separate rates that add up to Bartlett's Cook-side composite. Every one of them was lower for 2025:
- School District 46: down from 6.196934 to 5.086526, by far the largest piece
- Village of Bartlett: down from 0.920929 to 0.735331
- Bartlett Park District: down from 0.635602 to 0.507348
- Streamwood Park District: down from 0.663427 to 0.539803, for parcels inside its boundaries
- Elgin Community College District 509: down from 0.463051 to 0.387509
- Bartlett Public Library District: down from 0.279726 to 0.253207
The same page lists Bartlett special service areas, including Bluff City, Grasslands, Amber Grove and Inverness, each at a zero rate for 2025. Two homes in the same village can carry different rates depending on which park district or service area covers them. That is one more reason to look at the actual bill for the specific property rather than a village-wide figure.
When values get reset next on each side
The calendar also tells you how fresh a home's assessment is.
Cook County reassesses on a three-year cycle. The north suburbs, Hanover Township included, had their turn in 2025 and aren't scheduled for reassessment in 2026. On that cycle, the next one falls in 2028. Hanover homeowners could appeal to the Assessor by December 22, 2025, and to the Board of Review through February 18, 2026.
DuPage lists 2019 and 2023 as general assessment years. In the years between, township assessors record new values for properties with physical changes or individual revaluations rather than revaluing every parcel. If that four-year pattern holds, the next general year would be 2027. DuPage hasn't confirmed that on the page cited here.
On the Kane side, the Elgin Township Assessor notes that Illinois requires a general reassessment every four years and that the office also reviews properties in the years between.
All of this is general information about how Bartlett's three counties assess and bill property. It isn't legal, tax or financial advice, so check the details for a specific property with a tax professional or the county office that handles it.
Quick answers
How do I confirm which county a Bartlett home is in? The Village's Devon Avenue and Route 25 description is a starting point. DuPage parcel numbers that begin with "01" are in Wayne Township, and the county has a parcel and address lookup.
What exemptions show up on a DuPage bill? The DuPage Treasurer lists the general homestead exemption and the senior exemption at $8,000 each and encourages owners to check that the exemptions they qualify for appear on their bill.
Does the Kane bill look different now? Yes. Kane County's redesigned 2026 bill adds a pie chart showing where the tax goes, plus contacts for the officials involved in setting rates.
If you're weighing a Bartlett home north of Devon against one to the south, or one in Bartlett Pointe West, Executive Realty Group can help you pull the most recent bill for each address, read it next to the county calendar, and factor the tax picture into your offer. Contact Us whenever you're ready to compare.
