Seneca, Grundy County, Illinois Property Taxes
Property Taxes in Seneca, Illinois
Median Seneca, Illinois effective property tax rate: 2.73%, significantly higher than the national median of 1.02%, and higher than the Illinois state median of 2.33%.
Median Seneca, Illinois home value: $213,770
Median annual Seneca, Illinois tax bill: $6,132, $3,732 higher than the national median property tax bill of $2,400.
How are property taxes in Grundy calculated?
Property taxes in Seneca, 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 Seneca's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Seneca, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
Seneca, Grundy County, Illinois Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
2.73%
Estimate Property Tax Bill
$5,836
$5,416
How Does the Seneca Property Tax Calculator Work?
Use this Seneca property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Seneca's median effective tax rate of 2.73% — based on actual property records in Grundy County — to generate your estimate.
Enter your property's estimated assessed value — the figure the local assessment system uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Seneca'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 Seneca: rates range from 2.73% in 61360 to 2.73% in 61360, 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 Seneca.
About Seneca Property Taxes
About Property Taxes in Seneca, Grundy, Illinois
Seneca’s median effective property tax rate of 2.73% is higher than the Illinois state median of 2.33% and higher than the national median of 1.02%. The median property tax bill is $6,132, which is higher than the national median property tax bill of $2,400. This reflects Grundy County’s local levy structure and the way assessed values are taxed in the area.
Property tax rates are not uniform across Seneca. Homeowners in ZIP code 61360 carry a median effective rate of 2.73%, and the same ZIP code also has a median property tax bill of $6,132. That means location within the city can still shape what you owe, even when the local rate is consistent.
Seneca 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 Seneca, Grundy 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 Seneca'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 Seneca Tax Rate
2.73%
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 Grundy County Tax Rate
2.61%
Median Effective Illinois Tax Rate
2.33%
Median Effective United States Tax Rate
1.02%
Property Tax Rates Across Seneca, Grundy County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 61360 | 2.12% | 2.35% | 2.73% | 3.33% | 3.57% |
Source: Ownwell
Property Tax Assessment Values Across Seneca, Grundy County, Illinois
When examining property taxes in Seneca, 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 Grundy County appraisal district 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 Grundy 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 Seneca.
For example, the median home price in Seneca is $213,770, with tax bills ranging significantly across the county. 61360 has the highest median home price at $213,770.
Property Tax Assessment Values Across Seneca, Grundy County, Illinois
Source: Ownwell
$25,910
$191,346
$356,782
Median Seneca Market Value
$213,770
Median Grundy County Market Value
$179,043
Median Illinois Market Value
$227,888
Median United States Market Value
$235,294
Property Tax Assessment Values Across Seneca, Grundy County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 61360 | $15,454 | $116,875 | $213,770 | $291,972 | $407,332 |
Source: Ownwell
Property Tax Bills Across Seneca, Grundy County, Illinois
Property tax bills in Seneca are calculated by applying the local tax rate to a home’s assessed value, not its market price. The assessed value is determined by local officials and then multiplied by the combined rates set by taxing authorities such as schools, the county, and other local services. For homeowners, this means the bill can change when assessments change or when local budgets shift.
With a median home price of $213,770, property taxes can represent a significant ongoing cost. In Seneca, the median property tax bill is $6,132, which is well above the national median property tax bill of $2,400 and the national median property tax rate of 1.02%. Bills also vary widely across homes, with the 25th percentile at $3,648 and the 75th percentile at $7,913.
Because the tax bill is tied to assessed value and local tax rates, homeowners may see differences even among similar homes.
Median Seneca Tax Bill
$6,132
Median Grundy County Tax Bill
$4,909
Median Illinois Tax Bill
$5,277
Median United States Tax Bill
$2,400
Property Tax Bills Across Seneca, Grundy County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 61360 | $2,527 | $3,648 | $6,132 | $7,913 | $10,089 |
Source: Ownwell
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Appeal Deadline | July 1 |
Links | |
|---|---|
| Grundy Tax Assessor | |
| Website | tax.grundyco.org |