Property tax in LaSalle County, Illinois
In LaSalle County, the property tax bill comes from the LaSalle County Treasurer and County Collector. Every due date for the 2025 Real Estate Taxes Payable 2026 bill has passed, and the county had not posted the next cycle's dates when we checked. You can look up and pay the bill on the county's own payment page. Taken from LaSalle County's own pages, checked September 23, 2026.
The median property tax bill in LaSalle County, Illinois is $3,418 a year, which is about 2.11% of the county's median home value of $161,900. That effective rate is higher than the typical Illinois county (1.81%) and higher than the national median (0.81%). These are American Community Survey 5-year estimates (2024); your own bill depends on your home's assessed value and any exemptions.
Who sends the property tax bill in LaSalle County, and how do you pay it?
The bill comes from the LaSalle County Treasurer and County Collector. The value it is based on is set by a separate office, the LaSalle County Assessment Office (Chief County Assessment Officer), with the township assessors, which is who to ask if the value looks wrong. For how to look up and pay the bill, go to the county's own payment information.
Township assessors value homes, and the county Assessment Office handles exemptions and reviews those values. One county bill carries the taxes of every local district the property sits in, such as school districts, cities and park districts. Mobile homes are billed separately, with their own due date (June 19, 2026 this year). Card and eCheck payments online or by phone go through a private processor, which charges 2.40% (at least $2.00) for cards and $1.00 for an eCheck; the county does not keep the fee. Owners whose homes were damaged in the June 11, 2026 tornado can ask the Assessment Office for a disaster-related reassessment, which applies to the 2026 assessment paid in 2027. Back taxes already sold at a past tax sale are paid to the County Clerk, not the Treasurer.
When are property taxes due in LaSalle County?
Every due date for the 2025 Real Estate Taxes Payable 2026 bill has passed, and LaSalle County had not posted the next cycle's dates when we checked on September 23, 2026. If that bill is still unpaid, the late-payment rules below apply to it. Counties usually repeat the schedule, but confirm the new dates on your next bill. For the 2025 Real Estate Taxes Payable 2026 bill, LaSalle County splits the bill into 2 payments, the first due July 15, 2026 and the last September 9, 2026. State law adds interest of 1.5% a month, or part of a month, on an installment not paid by its due date. Owners with taxes unpaid after September 24, 2026 are sent a certified letter on September 25 and must add a $10 fee. Payments after September 25 must be made by cash, money order, cashier's check or certified check, and no personal checks are taken after October 1. October 16, 2026 is the last day to pay before the unpaid list is published. November 9, 2026 is the last day to pay before the tax sale (card payments end that day and the drop box closes at 3:00 p.m.), and the tax sale is November 10, 2026. For this tax sale the county has chosen to acquire all delinquent real estate taxes itself, as trustee for the local taxing districts, instead of offering them to private tax buyers; delinquent mobile home taxes still go to private buyers.
| Payment | Due | Note |
|---|---|---|
| First installment | July 15, 2026 (passed) | Under state law a mailed payment postmarked on or before the due date is on time. |
| Second installment | September 9, 2026 (passed) | This is also the last day to pay at a LaSalle County bank; after it, pay the Treasurer directly, by mail, online or by phone. |
From LaSalle County's published schedule, checked September 23, 2026. If a date falls on a weekend or holiday, the county's own rules on the next business day apply.
Estimate the property tax on a home in LaSalle County
Enter a home's market value for a ballpark at LaSalle County's average effective rate of 2.11% (Census). The real bill depends on the home's assessed value, the millage where it sits and any exemptions.
Estimated property tax: $3,416 / year
Property tax in LaSalle County at a glance
| Measure | Value |
|---|---|
| Median annual property tax | $3,418 |
| Median home value | $161,900 |
| Effective tax rate | 2.11% |
| Typical Illinois county rate | 1.81% |
| National median county rate | 0.81% |
Effective rate = median real estate taxes paid divided by median home value. Source: U.S. Census Bureau, American Community Survey 5-year estimates.
How does LaSalle County compare in Illinois?
Among Illinois's 102 counties, LaSalle County has the 19th highest effective property-tax rate: 18 rank higher and 83 rank lower. That is on the higher side for Illinois. Nationally, it ranks 61st of 3135 US counties by effective rate. See every Illinois county ranked.
How much do homeowners in LaSalle County actually pay?
The median is only the middle bill. Across LaSalle County's 33,778 owner-occupied homes, 55.3% pay $3,000 or more a year in property tax, 73.5% pay at least $2,000, and 7% pay under $800. Another 2.9% report paying no property tax at all, which usually means an exemption covers the whole bill.
| Annual bill | Homes | Share |
|---|---|---|
| Under $800 | 2,355 | 7% |
| $800 to $1,499 | 2,764 | 8.2% |
| $1,500 to $1,999 | 2,820 | 8.3% |
| $2,000 to $2,999 | 6,164 | 18.2% |
| $3,000 or more | 18,688 | 55.3% |
| No property tax paid | 987 | 2.9% |
Owners with a mortgage pay a median of $3,753 and owners without one pay $2,950. Owners who have paid off a home have usually held it longer, and in states that cap how fast an existing owner's assessment can rise, long-held homes carry lower assessed values. Census table B25103.
How does the LaSalle County property tax bill compare with local incomes?
The median property tax bill of $3,418 is about 4% of the median income of LaSalle County homeowner households, $85,684 a year. That compares two middles, so a retiree in a long-held home can pay a far larger share. 74.4% of LaSalle County's occupied homes are lived in by their owners; renters pay property tax too, just folded into rent.
Have property taxes gone up in LaSalle County?
Yes. The median bill went from $2,844 in 2015-2019 to $3,418 in 2020-2024, a 20.2% rise. Over the same span the median home value moved 27.3%, from $127,200 to $161,900. Bills rose more slowly than values, which is what assessment caps and falling millage rates do: the county is taxing a smaller share of each home's worth.
Two Census ACS 5-year periods with no survey years in common, in each period's own dollars. A change counts only if it exceeds the combined 90% margin of error.
Property tax in counties next to LaSalle County
LaSalle County borders 9 counties.
| County | Effective rate | Median bill | Median home value |
|---|---|---|---|
| DeKalb County, IL | 2.45% | $5,974 | $243,600 |
| Kendall County, IL | 2.37% | $7,651 | $322,400 |
| Woodford County, IL | 2.13% | $4,215 | $197,600 |
| LaSalle County, IL (this county) | 2.11% | $3,418 | $161,900 |
| Livingston County, IL | 2.05% | $2,908 | $142,200 |
| Bureau County, IL | 2.01% | $2,548 | $126,900 |
| Grundy County, IL | 1.99% | $5,420 | $271,700 |
| Lee County, IL | 1.97% | $3,048 | $154,600 |
| Marshall County, IL | 1.94% | $2,766 | $142,800 |
| Putnam County, IL | 1.57% | $2,705 | $172,700 |
How is a home assessed in LaSalle County?
Illinois assesses homes at 33.33% of market value in every county, LaSalle County included. How Illinois assesses and reappraises homes.
Is there a homestead exemption in LaSalle County?
Yes. Illinois's General Homestead Exemption is $6,000 of equalized assessed value in most counties, $8,000 in counties next to Cook, and $10,000 in Cook County. That is the Illinois rule, and it applies in LaSalle County. Illinois's exemptions and relief programs in full.
LaSalle County does not add relief programs of its own beyond the Illinois ones (checked September 23, 2026).
How to appeal your LaSalle County property assessment
In LaSalle County you appeal to the LaSalle County Board of Review. The deadline: A written appeal, signed with an affirmation, must be filed with the Board of Review within 30 days after the assessments for your township are published in the local newspaper. For the 2025 assessments (the bills paid in 2026) the deadline for every township was Monday, December 1, 2025; the 2026 assessments had not been published as of September 23, 2026. The Assessment Office no longer accepts documents by fax. How to file. Checked September 23, 2026 against the official appeal rules.
How Illinois's appeal process works, including the next level if the first one turns you down.
Illinois rules from primary state sources, reviewed September 7, 2026; sources on the Illinois page.
Work out your own numbers
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How much house can I afford?
Your income, debts and down payment against the 28/36 rule lenders actually use, with LaSalle County's tax rate to hand.
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Mortgage calculator
Monthly payment with principal, interest, tax and insurance, plus what an extra payment saves you.
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Illinois income tax
Brackets, standard deduction and what Illinois actually taxes.
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Sales tax in LaSalle County
The other local tax: combined state and local rate for this county.
Sources
- Median real estate taxes paid and median home value for LaSalle County, Illinois: U.S. Census Bureau, American Community Survey 5-year estimates (2020-2024), tables B25103, B25077, B25102, B25119 and B25003; the five-year comparison uses the 2015-2019 estimates. Neighboring counties: Census county adjacency file.