There isn’t one Bolingbrook IL property tax rate. The village sits across two counties, and your composite rate is the sum of every taxing district that serves your address, so what you owe depends on which side of the line your home sits on and which school, park, library, and fire districts cover it. Most Bolingbrook homes are in Will County, where composite rates generally run higher than on the DuPage side.
Why the County Line Changes Your Bill
Bolingbrook’s municipal boundary crosses into both Will County and DuPage County. The county your property sits in decides which assessor values it, which equalization factor applies, and which treasurer collects your payment. If you aren’t sure which county you’re in, check your deed or your most recent tax bill.
Will County properties generally carry higher composite tax rates than DuPage County properties, largely because of differences in the underlying tax base and the mix of overlapping districts. The Illinois Department of Revenue sets a county-level equalization factor each year so assessments stay uniform statewide. Will County’s equalization factor for the 2025 levy year (taxes payable in 2026) is 1.0000, meaning assessments were not adjusted up or down.1Illinois.gov. 2025 Will County Final Multiplier Announced DuPage County uses township-level factors instead of a single county-wide number, and for 2025 those run from roughly 1.079 to 1.097 depending on the township.2DuPage County, IL. Assessment Status
The multiplier matters because it adjusts your assessed value before any rate is applied. A higher multiplier means a bigger taxable base, and a bigger dollar bill, even when the rate itself holds steady.
What’s Actually in Your Rate
Your tax bill isn’t a single tax. It’s a stack of separate levies from every unit of local government that serves your address. In Bolingbrook, the biggest slice comes from schools. Properties on the Will County side are typically served by Valley View School District 365U or Plainfield Community Consolidated School District 202, and DuPage properties fall under different district boundaries. Across Illinois, school districts routinely account for the largest share of a homeowner’s bill.
Beyond schools, you’re also paying the Village of Bolingbrook, the Bolingbrook Park District, the Fountaindale Public Library District, the county, the township, and smaller districts for things like fire protection and the local community college. Each district sets its own levy, the county clerk calculates each corresponding rate, and your composite rate is simply the sum.
Because those district boundaries don’t line up with the municipal or county line, two Bolingbrook homes on the same street can carry different composite rates. The Will County Clerk publishes annual tax rate reports broken out by taxing district, and the DuPage County Clerk publishes similar booklets, so you can look up exactly which districts are levying against your property and what each contributes.3Will County, IL Elections. Tax Rates, Values and Extensions for All Taxing Districts
How the Dollar Amount Is Calculated
Illinois uses a multi-step formula to turn market value into a tax bill. The math is simple once you see the pieces.
The county assessor estimates your home’s fair market value, and Illinois law sets the assessed value at one-third (33.33%) of that figure for residential property.4Illinois Department of Revenue. What Is the Tax Rate for Property Taxes, and When Do I Have to Pay My Property Taxes A home valued at $300,000 has an assessed value of $100,000.
The Illinois Department of Revenue then applies the equalization factor for your county (or your township in DuPage) to produce the Equalized Assessed Value, or EAV. Since Will County’s 2025 factor is 1.0000, the assessed value and the EAV are the same for most Will County homes that year.1Illinois.gov. 2025 Will County Final Multiplier Announced DuPage properties see a small upward adjustment based on their township’s factor.
Any exemptions you qualify for come off the EAV. What remains is multiplied by your composite tax rate to produce the gross bill. Here’s that worked through for a Will County home:
- Fair market value: $300,000
- Assessed value (33.33%): $100,000
- Equalization factor (Will County, 2025): 1.0000
- Equalized Assessed Value: $100,000
- General Homestead Exemption: −$8,000
- Taxable EAV: $92,000
- Composite rate (example 9.5%): $92,000 × 0.095 = $8,740
Your actual composite rate will differ based on which districts serve your address. The exact number appears on your tax bill and in the county clerk’s annual rate report.
Exemptions That Reduce What You Owe
Several exemptions cut the taxable portion of your home’s value. Both Will and DuPage are contiguous to Cook County, so Bolingbrook homeowners qualify for the higher exemption amounts available in the collar counties.
The General Homestead Exemption reduces your EAV by up to $8,000 if you own and occupy the home as your primary residence.5Illinois General Assembly. Illinois Compiled Statutes 35 200/15-175 – General Homestead Exemption It’s automatic in some counties and requires a one-time application in others, so check with your county assessor if you’ve just bought.
Homeowners 65 or older qualify for an additional Senior Citizens Homestead Exemption of up to $8,000 off EAV in Will and DuPage counties.6Illinois General Assembly. Illinois Compiled Statutes 35 200/15-170 – Senior Citizens Homestead Exemption The Senior Citizens Assessment Freeze goes further by locking your EAV at its base-year level so increases in assessed value don’t raise your taxes. To qualify for 2026, you must be 65 or older during the year, have total household income of $75,000 or less for 2025, and own and occupy the property on January 1 of both 2025 and 2026.7Illinois Department of Revenue. Property Tax Relief – Homestead Exemptions, PTELL, and Senior Citizens Real Estate Tax Deferral Program The freeze doesn’t stop your bill from rising if tax rates climb; it only holds the assessed-value side still.
Homeowners with a disability get a $2,000 EAV reduction with documentation through the county assessor. Veterans with a service-connected disability certified by the U.S. Department of Veterans Affairs get reductions that scale with the rating:7Illinois Department of Revenue. Property Tax Relief – Homestead Exemptions, PTELL, and Senior Citizens Real Estate Tax Deferral Program
- 30% to 49% disability: $2,500 off EAV
- 50% to 69% disability: $5,000 off EAV
- 70% or higher: the first $250,000 of EAV is fully exempt
A veteran rated 70% or higher on a home with an EAV under $250,000 owes nothing in property tax.
When to Pay and What a Late Payment Costs
You pay the treasurer of the county where your home sits. Will County and DuPage County have separate treasurer’s offices, separate payment portals, and separate deadlines, and both follow Illinois’s standard two-installment schedule. For 2025 taxes payable in 2026, the first installment is due June 1, 2026, and the second is due September 1, 2026.8Will County. Will County Treasurer9DuPage County, IL. DuPage County Treasurer You can pay both installments with the first payment if you want to be done.
Both counties accept online payments, mailed checks, and in-person payments. DuPage County charges a 2.10% convenience fee on credit or debit card payments through its online portal, and none of that fee goes to the county.10DuPage County, IL. ePay Your Real Estate Taxes Will County’s treasurer also takes online payments; check its site for current processing fees, which can change between billing cycles.
Missing a deadline is expensive. Illinois law charges 1.5% interest per month, or any portion of a month, on unpaid taxes in counties with fewer than three million residents, which covers both Will and DuPage.11Illinois General Assembly. Illinois Compiled Statutes 35 200/21-15 – Property Tax Code A $4,000 installment left unpaid for six months would pick up $360 in penalties alone. If taxes stay unpaid long enough, the county collector offers them at the annual tax sale, a buyer acquires a lien on your home, and failure to redeem within the statutory period can ultimately cost you the property. Pay on time, or call the treasurer’s office right away if you can’t.
Appealing If You Think the Assessment Is Too High
If your home is assessed above fair market value, or above similar homes nearby, you can appeal. The process starts at the county Board of Review.
In Will County, the Board of Review complaint period typically opens in August.12Will County Supervisor of Assessments. Welcome to the Will County Supervisor of Assessments Office In DuPage County, the deadline is 30 days after your township’s assessment roll is published, and those dates vary by township, so check the DuPage County assessment status page for yours.13DuPage County, IL. Appeal Process
Come with evidence. The strongest appeals use recent sales of comparable homes (same age, size, construction, and neighborhood) that sold for less than your assessed market value. A recent appraisal from a licensed appraiser carries weight too. If your argument is that neighboring homes are assessed lower, bring their assessment data.
If the Board of Review rules against you, you can appeal to the Illinois Property Tax Appeal Board within 30 days of the written decision. For residential appeals seeking a change of less than $100,000 in assessed value, you may submit comparable sales data or an appraisal, and the Board requires at least three comparables on its grid analysis form.14Property Tax Appeal Board. Filing Your Appeal Some homeowners hire tax appeal attorneys who work on contingency, taking a percentage of the first-year savings. You can also file on your own at no cost beyond the time it takes.