Oswego, Kane County, Illinois Property Taxes
Property Taxes in Oswego, Illinois
Median Oswego, Illinois effective property tax rate: 2.10%, significantly lower than the national median of 1.02%, and lower than the Illinois state median of 2.33%.
Median Oswego, Illinois home value: $233,013
Median annual Oswego, Illinois tax bill: $4,646, higher than the national median property tax bill of $2,400.
How are property taxes in Kane calculated?
Property taxes in Oswego, Illinois are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.
Understanding Oswego's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Oswego, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
Oswego, Kane County, Illinois Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
2.1%
Estimate Property Tax Bill
$4,893
$4,541
How Does the Oswego Property Tax Calculator Work?
Use this Oswego property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Oswego's median effective tax rate of 2.10% — based on actual property records in Kane County — to generate your estimate.
Enter your property's estimated assessed value — the figure the local appraisal district uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Oswego's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.
Your bill may vary by ZIP code within Oswego: rates range from 2.10% in 60543 to 2.10% in 60543, primarily due to differences in school district levies and local assessment districts.
For a more precise estimate, scroll down to explore ZIP code-level tax rate trends across Oswego.
About Oswego Property Taxes
About Property Taxes in Oswego, Kane, Illinois
Oswego’s median effective property tax rate of 2.10% is lower than the Illinois state median of 2.33% and higher than the national median of 1.02%. This rate reflects the Kane County base levy combined with local school district levies and special service areas that can vary by subdivision throughout the city.
Property tax rates are not uniform across Oswego. Homeowners in the 60543 ZIP code carry a median effective rate of 2.10%, and that same ZIP also reflects the city’s median home price of $233,013 and median tax bill of $4,646. Understanding how your assessed value is set can make a meaningful difference to your annual tax bill.
Oswego homeowners who believe their assessed value is too high can file a formal appeal with the Tax Assessor before the June 1, 2026 deadline each year.
If your estimated bill seems higher than expected, Ownwell can review your assessment and protest on your behalf. You only pay if we save you money.
Property Tax Rates Across Oswego, Kane County, Illinois
As noted earlier, local government entities set tax rates, which can vary widely within a state.
Why? Because annually, each county estimates its required budget to provide services and divides that by the total value of all taxable property within its jurisdiction. This calculation results in the property tax rate.
While there are votes and laws involved in setting tax rates and budgets, in a nutshell, this is the annual process.
Below, you can compare Oswego's effective property tax rate to other cities in Illinois and the median property tax rates in Illinois and the U.S.
Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective Oswego Tax Rate
2.10%
Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective Kane County Tax Rate
2.49%
Median Effective Illinois Tax Rate
2.33%
Median Effective United States Tax Rate
1.02%
Property Tax Rates Across Oswego, Kane County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 60543 | 1.91% | 1.98% | 2.10% | 2.14% | 2.18% |
Source: Ownwell
Property Tax Assessment Values Across Oswego, Kane County, Illinois
When examining property taxes in Oswego, Illinois, understanding the distinction between "market value" and "assessed value" is crucial.
The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The Kane County assessment office estimates the market value for tax purposes.
The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.
Assessment notices:
In Kane County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of the month when notices are sent.
Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. By providing insights into how assessed and market values are determined, this section helps property owners navigate their tax responsibilities and understand the valuation processes affecting their property taxes in Oswego.
For example, the median home price in Oswego is $233,013, with tax bills ranging significantly across the county. 60543 has the highest median home price at $233,013.
Property Tax Assessment Values Across Oswego, Kane County, Illinois
Source: Ownwell
$156,664
$405,361
$654,058
Median Oswego Market Value
$233,013
Median Kane County Market Value
$279,433
Median Illinois Market Value
$227,888
Median United States Market Value
$235,294
Property Tax Assessment Values Across Oswego, Kane County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 60543 | $187,082 | $214,262 | $233,013 | $264,913 | $273,805 |
Source: Ownwell
Property Tax Bills Across Oswego, Kane County, Illinois
Property tax bills in Oswego are calculated by applying the local tax rate to a home’s assessed value, which is based on the market value of the property. Local taxing bodies, including schools and municipal services, help determine the final bill, so the amount can vary even among similar homes.
With a median home price of $233,013, homeowners in Oswego face property tax bills that are often well above the national median property tax bill of $2,400. The 25th percentile tax bill is $4,366, while the 75th percentile is $5,442 and the 90th percentile reaches $5,770.
That means property taxes can have a major impact on household budgets, especially when assessed values rise. In Oswego, the median tax bill is $4,646, showing how local assessments and taxing rates combine to shape what homeowners owe each year.
Median Oswego Tax Bill
$4,646
Median Kane County Tax Bill
$6,802
Median Illinois Tax Bill
$5,277
Median United States Tax Bill
$2,400
Property Tax Bills Across Oswego, Kane County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 60543 | $3,855 | $4,366 | $4,646 | $5,442 | $5,770 |
Source: Ownwell
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Appeal Deadline | June 1 |
Links | |
|---|---|
| Kane Tax Assessor | |
| Website | kaneil.devnetwedge.com |