Use the Property Index Number printed on the tax bill when you have it.

Search by street address, then confirm the property before opening tax details.

Useful for nearby parcels, similar addresses or uncertain parcel boundaries.

Use this section for the current installment and live amount due.

Check whether a homeowner, lender or prior payer already submitted money.

Check whether expected homestead, senior, disability or veteran relief appears.

DuPage County’s 2026 calendar lists April 29 for mailing 2025 real estate tax bills.

Pay or timely submit the first installment by June 1, 2026.

1.5% monthly penalty applies to a late first installment.

The second coupon is due September 1, 2026.

1.5% monthly penalty begins on the unpaid second installment.

The Treasurer says payment must be made by this date to avoid delinquent-tax newspaper publication.

The current calendar says qualifying payments must be received by 4:30 p.m. to avoid a certified delinquent bill.

The Treasurer calendar lists this as the last day for the online system and personal checks.

Cash, cashier’s check or money order becomes the key late-cycle payment route.

Payment must be received before 4:30 p.m. to keep the property from being offered at tax sale.

The annual sale for unpaid 2025 real estate taxes begins at 9 a.m.

DuPage uses the U.S. Postal Service postmark—not a private meter mark—to determine late-payment penalty.

The same 10-digit identifier should appear in the property record and payment process.

Used for the first installment due June 1.

Used for the second installment due September 1.

Use these fields when reviewing whether the underlying assessment looks reasonable.

The equalization factor produces the equalized assessed value used in the tax process.

Check General Homestead, Senior, disability, veteran or other applicable benefits.

Schools, municipalities, county, forest preserve, townships, parks, libraries and other districts can affect the combined rate.

Review lender information before making a separate homeowner payment.

Use the current Treasurer record rather than an old copy if payments or penalties may have changed.

For qualifying principal residences. DuPage says the Township Assessor automatically grants it in most cases.

For qualifying owners age 65 or older who own, occupy and are liable for taxes on the property.

Protects against some assessment increases but does not freeze the entire tax bill.

DuPage lists an annual $2,000 reduction in assessed value for qualifying owners.

Benefit depends on qualifying service-connected disability and applicable program rules.

Can provide an exemption on qualifying assessment increases from home improvements for up to four years.

The Treasurer lists age 65 by June 1 of the application year.

Current program guidance lists combined annual household income of no more than $75,000.

Applicant must meet the ownership and occupancy requirement.

DuPage says the maximum for the 2025 tax year is $7,500.

The deferred amount works like a state-backed loan and creates a lien.

The Treasurer accepts annual applications through February 27 when the program is offered.

Applies to each late installment under the Treasurer’s current instructions.

Pay by the county’s publication-avoidance deadline to reduce later delinquency complications.

Late-cycle payment methods become more restricted after personal checks and online payment close.

Current calendar says certified funds must be received by this time to prevent tax sale.

The annual sale begins for unpaid 2025 real estate taxes.

A valid USPS postmark—not a meter mark—is used for ordinary late-payment penalty timing.

Likely cause: no bill, wrong address format or new ownership.

Next step: use address or map search in the Property Information portal.

Likely cause: processing delay, rejected bank payment or wrong parcel.

Next step: compare payment confirmation with Tax Payment History.

Likely cause: insufficient funds, rejected account or payment error.

Next step: check the new balance plus the $25 return-item fee and late charges.

Likely cause: assessment or property-record issue.

Next step: contact the Township Assessor and check the Board of Review deadline.

Likely cause: new ownership, application issue or wrong exemption year.

Next step: contact the Township Assessor or Supervisor of Assessments.

Likely cause: servicer timing or escrow error.

Next step: contact the servicer and monitor payment history before the due date.