Property Taxes in Naperville: What Every Homebuyer Should Know

Understanding DuPage and Will County Property Taxes Before You Buy in Naperville

Property taxes are one of the biggest ongoing costs of owning a home in Naperville, and understanding how the system works before you make an offer, not after you close, is one of the most useful things a buyer can do. Naperville actually spans two counties. Most of the city sits in DuPage County, administered through Naperville Township, but a meaningful portion in the south and east, largely around the 60564 zip code, falls in Will County under Wheatland Township. The rules are similar in structure but run through separate offices with their own timelines, so it matters which side of the line your home falls on.

How Property Taxes Are Calculated

Illinois law requires residential properties statewide to be assessed at one-third, or 33.33%, of fair market value, a number set by the township assessor for each parcel. The Illinois Department of Revenue then applies a state equalization factor to keep values consistent across counties, which produces the Equalized Assessed Value, or EAV. That EAV is the number your tax rate actually applies to. School districts, park districts, library districts, municipalities, townships, fire districts, and other local taxing bodies each submit their own budget levy, and the county clerk divides each levy by the total EAV in that district to set a rate. All of those overlapping rates combine and apply to your property's EAV to produce your annual bill. This process works the same way in both DuPage and Will County, since it's set by state law, but the specific offices, publication schedules, and appeal deadlines are separate.

DuPage County: What Naperville Buyers Typically Pay

DuPage County's effective property tax rate runs roughly 1.95% to 2.2% of market value, higher than the national average of about 1.0%, but lower than Cook County's 2.0% to 2.5% range. Naperville's median effective rate on the DuPage side is close to 2.05%, and it varies by zip code: homes in 60564 carry a median effective rate around 2.23%, while 60563 runs closer to 2.03%, a gap driven largely by different school district levies between District 203 and District 204. Median annual bills across Naperville's DuPage zip codes range from roughly $7,227 to $9,936. DuPage reassesses on a three year cycle, and the county's nine townships, including Naperville Township, each publish their assessment rolls on different dates throughout the year. The appeal window is 30 days from that specific publication date, so there's no single countywide deadline. Naperville Township's own publication and appeal dates are posted at napervilletownship.com.

Will County: What Naperville Buyers in Wheatland Township Should Know

The Will County portion of Naperville runs through Wheatland Township, whose assessor's office is at 4232 Tower Court, right in Naperville. Wheatland Township covers parts of Naperville along with sections of Aurora, Bolingbrook, and Plainfield. The same 33.33% assessment ratio and the same statewide exemption amounts apply here as in DuPage, since those come from state law rather than county rules. What differs is timing: Will County's 2026 assessments for Wheatland Township are set to publish August 12, 2026, opening a 30 day appeal window that runs through September 14, 2026. That's a useful date to know if you're buying on the Will County side and want to review your assessment early. Will County's tax bills follow the same in-arrears structure as DuPage, with the 2025 tax year billed in 2026, and installments due June 1 and September 1. Effective rates on the Will County side of Naperville run a bit higher in some zip codes, with 60564 showing a median effective rate closer to 2.37% by some estimates, so it's worth checking your specific parcel rather than assuming DuPage numbers apply if you're house hunting in that part of town.

How Property Taxes Affect Monthly and Annual Costs

Whichever county your home falls in, most lenders require escrowing property taxes for buyers putting down less than 20%, so it's worth running the math on any home before assuming your total monthly payment is just principal and interest. Both counties bill in arrears, meaning the bill paid in 2026 covers 2025 taxes, and both use the same June 1 and September 1 installment structure this year. Late payments in either county carry a 1.5% per month penalty, which adds up quickly if it sits.

Exemptions and Long-Term Planning

The core exemptions are the same across both counties, since they're set by Illinois statute rather than county policy. The General Homestead Exemption reduces EAV by $6,000 for an owner-occupied primary residence and only needs to be filed once. The Senior Citizens Homestead Exemption adds another $8,000 EAV reduction for homeowners 65 and older. The Senior Citizens Assessment Freeze, currently available to qualifying seniors with household income below $65,000, freezes the EAV at a base year so future assessment increases don't raise the bill. It requires filing every year to maintain, and Illinois recently passed a law raising that income limit to $75,000 starting with the 2026 tax year, payable in 2027. If you believe your assessed value is too high, the appeal process runs through your specific township assessor first, then the county Board of Review, with deadlines that vary by township and by county, so confirming your exact window matters more than assuming a fixed date. DuPage residents can reach the Supervisor of Assessments office at 630-407-5858, and Will County residents can reach the Wheatland Township Assessor's office directly at 630-717-0092.

FAQs

Is Naperville in DuPage County or Will County? Both. Most of Naperville is in DuPage County, primarily under Naperville Township, while a portion in the south and east falls in Will County under Wheatland Township. Which county your home is in affects your assessor, your Board of Review, and your appeal deadline.

How are property taxes calculated in Naperville? Township assessors in both counties value property at roughly one-third of fair market value, producing an Equalized Assessed Value after the state equalization factor applies. Local taxing bodies then apply their rates to that EAV to produce the total bill.

When are property taxes due in Naperville? Both DuPage and Will County are billing on the same schedule this year: the first installment is due June 1, 2026, and the second is due September 1, 2026, covering 2025 taxes. Late payments carry a 1.5% per month penalty in both counties.

When can I appeal my property tax assessment in Naperville? It depends on which county and township your home is in. DuPage's nine townships each publish assessment rolls on different dates, with a 30 day appeal window after each one. In Wheatland Township, Will County, the 2026 assessments publish August 12, 2026, with appeals due by September 14, 2026.

Get more insights on homeownership costs on Life in Naperville.
Have questions about buying in Naperville? Connect with Ruth Sheahan today.

Sources: wheatlandassessor.com ownwell.com/naperville-property-taxes, dupagecounty.gov/tax-information