This page helps users handle Property Tax tasks in Winnebago County, Illinois, including looking up parcel tax details, checking payment options, and finding the right county office for tax questions.
The main public tool is the Winnebago County Treasurer Parcel Tax Details Inquiry, with related help from the Winnebago County Treasurer and the Supervisor of Assessments.
Winnebago County Treasurer Parcel Tax Details Inquiry
Use the Winnebago County Treasurer Parcel Tax Details Inquiry to view current parcel tax information and historical information back through 2003.
You can search by several fields, depending on what information you have available.
- Parcel Identification Number, using the PIN fields
- Mobile Home Number, with the mobile home option when needed
- Parcel location, including number, direction, street, and suffix
- Owner name, using last name and first name
After locating the parcel, review the tax details shown for the property. For payment questions, use the Treasurer’s tax information page or contact the Treasurer’s Office.
Current year tax bills and payment options
Winnebago County 2025 property tax bills were scheduled to be mailed in early May 2026. The listed installment due dates are June 12, 2026, and September 11, 2026.
Partial payments are not accepted for current year real estate taxes. Checks should be made payable to the WINNEBAGO COUNTY COLLECTOR, and mailed payments must include the correct installment coupon.
The Treasurer lists these current payment options:
| Payment method | Key details |
|---|---|
| Online e-Check | Free ACH payment through the online bill payment option. |
| Debit or credit card | 2.25% fee charged by the payment servicer. |
| Phone payment | Automated Autoagent / Municipay line at (815) 859-9650; card fees apply. |
| Mail bill and payment to Winnebago County Treasurer, 404 Elm Street, Rm 205, Rockford, IL 61101. | |
| In person | Pay at the Winnebago County Treasurer’s Office, 404 Elm Street, Room 205, Rockford, IL 61101. |
| Participating financial institutions | Many local banks accept property tax payments with the tax bill. |
Back taxes cannot be paid online. For 2024 or prior year taxes, contact the Winnebago County Clerk’s Office at (815) 319-4253.
For county payment details, fees, mobile home tax information, senior tax programs, and tax sale guidance, review the Winnebago County Treasurer tax information page.
Mobile home taxes
Mobile home tax bills are mailed 60 days before the due date. The current due date listed by the Treasurer is April 10, 2026.
Owners of mobile homes on January 1 of each year are responsible for the tax. The tax is calculated by multiplying the rate, based on the age of the mobile home, by the square footage.
If mobile home taxes are not paid by the due date, a $25.00 late fee is applied per year. To receive a receipt, send a self-addressed, stamped envelope with the payment.
Assessments and exemptions
The Supervisor of Assessments handles assessment records, assessment change notices, exemptions, tax maps, equalization, and questions about the assessment process.
For assessment-related issues, use the Supervisor of Assessments office page. The office also lists property tax exemptions and WinGIS parcel information search resources.
Senior property tax programs listed for Winnebago County include the Senior Citizen Exemption, Senior Citizen Assessment Freeze Exemption, and Senior Citizen Tax Deferral Program.
Tax sale and prior year taxes
Illinois law requires the county collector or treasurer to sell unpaid current-year taxes. In Winnebago County, the sale is of unpaid taxes, not the property itself.
After a tax sale, the owner of record works with the Winnebago County Clerk’s Office for redemption amounts. The listed redemption period is 2 1/2 years, or 1 year for vacant non-farm land and properties with 7 or more residential units or commercial or industrial properties. The period may be extended by the certificate holder.
Tax sale auctions are typically held in the last week of October or early November, with the date determined by the Treasurer. Registered buyers must pay the required registration and delinquent property listing fees.
Parcel maps and property search tools
WinGIS provides property searches for Winnebago County, with layers, property information, markup tools, and measuring tools. It also provides access to historic aerials through the Winnebago County property search.
Use WinGIS property search resources when you need map-based property information alongside tax or assessment details.
Property tax contacts
Use the Treasurer for tax bills, current payments, tax sale questions, and mobile home certifications. Use the Supervisor of Assessments for assessments, exemptions, and tax map questions.
-
Winnebago County Treasurer, 404 Elm Street, Room 205, Rockford, Illinois 61101
Phone: (815) 319-4400
Email: [email protected]
Office hours: Monday through Friday, 8 a.m. – 5 p.m. -
Winnebago County Supervisor of Assessments, 404 Elm Street, Room 301, Rockford, IL 61101
Phone: (815) 319-4460
Email: [email protected]
Office hours: Monday through Friday, 8:00 AM - 5:00 PM -
Winnebago County Clerk’s Office
Phone for back taxes and redemption amounts: (815) 319-4253
Common questions
Where can I look up Winnebago County property tax details online?
Use the Winnebago County Treasurer Parcel Tax Details Inquiry to search by PIN, mobile home number, parcel location, or owner name.
How far back does the parcel tax inquiry go?
The parcel tax inquiry provides current parcel information and historical information through 2003.
Can I pay back taxes online in Winnebago County?
No. Back taxes cannot be paid online. Contact the Winnebago County Clerk’s Office at (815) 319-4253 for prior year tax payment or redemption information.
Are partial payments accepted for current year real estate taxes?
No. Current year partial payments are not accepted. Each installment payment should be for the full installment amount.
Who handles property tax exemptions in Winnebago County?
The Supervisor of Assessments handles homestead exemption records and helps taxpayers with property tax exemption filings.
What fee applies to online card payments?
Debit and credit card payments are charged 2.25% of the amount paid. E-Check ACH payments are free.