DuPage County property tax due dates fall on June 1 and September 1 each year, split into two installments. The bills mailed in 2026 cover the 2025 tax year, because Illinois collects property taxes in arrears — the bill in your hand this spring reflects last year’s assessed value.1DuPage County. DuPage County Treasurer
Why the Two Installments Are Not Equal
The first installment is not based on your current assessment. It equals 55% of your total tax bill from the prior year and functions as an estimated payment while the county finalizes this year’s numbers.2Illinois Department of Revenue. What Should I Do if I Have Not Received My Property Tax Bill The second installment picks up the remainder after the updated tax rate and any exemptions are applied. So the September bill can land noticeably higher or lower than the June one depending on how assessments and rates moved.
Both installment coupons arrive in a single mailing.1DuPage County. DuPage County Treasurer Keep the full bill after paying in June; you’ll need the second coupon in September.
Ways to Pay
You have four practical options: online, mail, participating banks, or in person. Each payment requires your Property Index Number (PIN), printed on the top of your bill as “Parcel Number.” If you’ve lost the bill, look up the PIN by address on the county’s Property Lookup Portal.3DuPage County. Supervisor of Assessments – Property Lookup Portal Write the PIN on any check so the payment gets applied to the right parcel.4DuPage County. Tax Information
Online
The Treasurer’s ePay portal accepts electronic checks and Visa, MasterCard, or Discover. Credit and debit card payments carry a 2.10% processor fee that does not go to the county.5DuPage County. ePay Your Real Estate Taxes On a $5,000 installment, that surcharge is about $105, so eCheck is the cheaper online route.
By Mail
Through October 31, 2026, mail payments to the lockbox: DuPage County Collector, Bill Payment Center, P.O. Box 4203, Carol Stream, IL 60197. After October 31, mail goes to the Treasurer’s Office at 421 N. County Farm Road, Wheaton, IL 60187. Make the check payable to “DuPage County Collector” and include the correct installment coupon.6DuPage County. Paying Real Estate Taxes By Mail
The USPS postmark controls, so a payment postmarked on the due date is on time even if it arrives days later.4DuPage County. Tax Information One catch: after October 31, personal checks are no longer accepted. From that point forward, only cashier’s check, money order, or cash will do.6DuPage County. Paying Real Estate Taxes By Mail
At a Participating Bank
Dozens of banks across the county take property tax payments from May 1 through September 1, 2026. Bring your payment coupon — some branches accept copies, but not all. The Treasurer publishes the full list by city.7DuPage County. Banks in DuPage County Banks stop accepting payments after the September deadline, so this channel closes with the second installment.
In Person
Starting May 1, 2026, you can pay at the Treasurer’s Office at 421 N. County Farm Road in Wheaton, Monday through Friday, 8:00 a.m. to 4:30 p.m. Cash, check, and credit or debit cards are all accepted at the counter.5DuPage County. ePay Your Real Estate Taxes
If Your Lender Pays From Escrow
Many homeowners have taxes paid through a mortgage escrow account. Even so, verify each installment. The simplest check: search your PIN on the Treasurer’s online portal a few days after each due date and confirm the payment shows as posted.
If the county sends a delinquency notice while you have an active escrow, contact your servicer right away. The Consumer Financial Protection Bureau recommends putting the request in writing and sending a formal notice of error along with a copy of the tax bill. Also let the county know you’re working with your servicer, so collection steps don’t move forward while the error is being fixed.8Consumer Financial Protection Bureau. What Should I Do if I Get a Tax Bill From the City or County Saying That My Mortgage Servicer Did Not Pay My Taxes
Penalties for Missing a Due Date
Interest starts accruing the day after an installment deadline. Illinois law sets the rate at 1.5% per month, and a partial month counts as a full month.9Illinois General Assembly. 35 ILCS 200/21-15 – General Tax Due Dates; Default by Mortgage Lender The Treasurer has no authority to waive it.
On a $5,000 unpaid installment, one month of interest is $75. Six months in, the penalty alone reaches $450. Interest is charged on the full unpaid balance, so it stacks up quickly.
What Happens if Taxes Stay Unpaid
Prolonged delinquency leads to the annual tax sale. For 2025 taxes payable in 2026, the DuPage sale is scheduled to begin November 19, 2026. If either installment is still unpaid in early October, your name and parcel are published in local newspapers, and a $10 charge is added to your balance for publication and certified mailing. The last day to pay and avoid the sale is November 18, 2026, by 4:30 p.m., and only cashier’s check, cash, or money order is accepted at that point.10DuPage County. Tax Sale Information
At the sale, the county sells the tax debt, not the property. A third-party buyer pays your delinquent taxes and takes a lien. You still own the home, but you now owe the buyer everything plus interest and legal fees. Illinois gives you two and a half years from the sale date to redeem by paying that full amount. For vacant non-farm land, commercial property, and buildings with seven or more residential units, the redemption window is one year. Miss it, and the tax buyer can petition a court for a tax deed, which transfers ownership.11DuPage County. Tax Redemption
Exemptions That Cut the Bill Before You Pay It
Several exemptions reduce your equalized assessed value (EAV), which lowers what you actually owe. Confirm them each year, because a few require an annual application.
General Homestead
If you own and live in the home as your primary residence, you qualify. Because DuPage is contiguous to Cook County, the maximum EAV reduction is $8,000.12Illinois General Assembly. 35 ILCS 200/15-175 – General Homestead Exemption Township assessors usually grant this automatically, without a separate application.13DuPage County. Forms and Documents
Senior Citizens Assessment Freeze
Homeowners 65 or older with household income of $75,000 or less can apply to freeze the EAV at the level it was when they first qualified. This one requires an annual application. For the 2026 tax year (payable in 2027), eligibility is based on 2025 household income.14DuPage County. Low-Income Senior Citizens Assessment Freeze Homestead Exemption
Disabled Veterans
Veterans with a service-connected disability of at least 30%, certified by the U.S. Department of Veterans Affairs, may qualify for an exemption on the first $250,000 of the home’s EAV, after subtracting any portion used commercially. The amount scales with the disability rating, and the veteran must be receiving VA disability compensation.15DuPage County. Standards for Veterans With Disability and WWII Veterans
Appealing the Assessment Behind Your Bill
If the assessed value looks too high, you can appeal to the DuPage County Board of Review. The deadline is 30 days after your township’s assessment roll is published, and each of the nine townships publishes on its own date. The county’s Assessment Status page lists those dates and the matching filing deadlines.16DuPage County. Appeal Process
Before filing, ask your township assessor to review your property record card. Errors in square footage, lot size, or building features are common and can often be corrected without a formal appeal. If you do file, submit supporting evidence — recent comparable sales, a professional appraisal, or photos showing condition issues. Thin filings tend to be dismissed or confirmed at the existing assessment.17DuPage County. Rules of the Board of Review If the Board rules in your favor, the reduced EAV shows up on your next bill; if it doesn’t, you can appeal further to the Illinois Property Tax Appeal Board.