Winnebago County Property Tax Appeal, Illinois

Travis Bunn·Updated July 22, 2026

Winnebago County is located in northern Illinois with Rockford as its county seat, the state's fifth-largest city with a population of approximately 146,961. Major population centers include Loves Park, Machesney Park, Roscoe, and Belvidere. With an effective property tax rate of 2.48%, significantly higher than the national median of 1.02% and the Illinois state median of 2.33%, property tax appeals are particularly important for Winnebago County homeowners. The county's median annual tax bill of $3,850 is substantially above the national median of $2,400, making successful appeals crucial for residents seeking relief from elevated property taxes.

Notable cities: Rockford, Loves Park, Machesney Park, Roscoe, Belvidere

Median Home

$155,100

Tax Rate

2.48%

Annual Tax

$3,850

Population

284,383

On the typical Winnebago County home, valued near $155,100 at the county’s effective tax rate of 2.48%, an over-assessment of even 10% means you are overpaying year after year until you appeal it. Here is how to find out if yours qualifies.

2026 Appeal Deadline: 30 calendar days after assessments are published (typically late August)

The statutory time for filing appeals with the Winnebago County Board of Review is 30 calendar days after the assessments are published. Assessments are generally published at the end of July. For the 2025 tax year, assessments were published on July 31, 2025, making the appeal deadline August 29, 2025. It is critical to watch for your assessment notice and mark your calendar immediately, as this deadline is statutory and cannot be waived.

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Aerial view of an Illinois residential neighborhood. Winnebago County appeal guide.

How Winnebago County Assesses Property

33.33%of market value

Assessed by: Winnebago County Supervisor of Assessments

Assessment cycle: annual

Notices typically mailed: Spring (typically mailed mid-May, published end of July)

Illinois assesses residential property at 33.33% of fair market value statewide. If your home's market value is $155,100 (the county median), at Illinois's 33.33% assessment ratio your assessed value would be approximately $51,700. At Winnebago County's effective tax rate of 2.48%, this would result in approximately $3,850 in annual taxes. The assessed value is determined by the county assessor and may differ from your property's market value depending on local assessment ratios and exemptions you receive.

The Appeal Process

Appeals are heard by the Board of Review. For assessed value reductions under $33,333, the Board will send a notice of its preliminary determination to you and the township assessor, and a hearing is optional. For reductions of $33,333 or more, you will be scheduled for a formal hearing where you can present your evidence and testimony.

Step 1: Contact your township assessor first to attempt an informal resolution of any assessment errors before filing a formal appeal with the Board of Review.

Step 2: If unsuccessful with the township assessor, obtain the Winnebago County Real Estate Assessment Complaint Form from wincoil.gov/departments/supervisor-of-assessments/board-of-review or from the Board of Review office at 404 Elm Street, Room 301, Rockford, IL 61101.

Step 3: Complete the complaint form with all applicable sections filled out, including your mailing address and property information. Read the Board of Review Rules and Procedures before filing.

Step 4: File your completed complaint form along with supporting evidence (comparable sales, appraisal, photos, repair estimates) within 30 calendar days of the assessment publication date. Mail, hand-deliver, or file online.

Step 5: For properties requesting reductions under $33,333 in assessed value, a hearing is optional unless you request one. For reductions of $33,333 or more, you will be scheduled for a hearing before the Board of Review.

Step 6: If dissatisfied with the Board of Review's decision, appeal to the Illinois Property Tax Appeal Board (PTAB) within 30 days of the Board of Review's decision. Forms are available at ptab.illinois.gov.

Step 7: If still unsatisfied after PTAB review, you may ultimately appeal to circuit court as a final remedy.

Required form: Winnebago County Real Estate Assessment Complaint Form (available from Board of Review)

Filing Methods

online:Available at wincoil.gov/departments/supervisor-of-assessments/board-of-review

mail:404 Elm Street, Room 301, Rockford, IL 61101

in-person:404 Elm Street, Room 301, Rockford, IL 61101

Evidence to Bring

Recent comparable sales of similar properties (preferably within 12 months of January 1 assessment date)Professional appraisal reportPhotographs documenting property condition or defectsRepair estimates showing needed workRecent purchase closing statement if bought near January 1Documentation of factual errors in assessor's property record card

Winnebago County Assessor Contact

Winnebago County Supervisor of Assessments

Phone: (815) 319-4460

Address: 404 Elm Street, Room 301, Rockford, IL 61101

Website: https://wincoil.gov/departments/supervisor-of-assessments/

Online Portal: https://wincoil.gov/departments/supervisor-of-assessments/board-of-review

Hours: 8:00 AM - 5:00 PM (Monday-Friday)

Tax Exemptions in Winnebago County

General Homestead Exemption

Up to $6,000 reduction in EAV (based on increase above 1977 EAV, whichever is less). Approximate savings of $569 annually in City of Rockford for 2024 taxes.

Reduces the equalized assessed value (EAV) for owner-occupied residential properties

Eligibility: Must own and occupy property as principal dwelling on January 1st of assessment year. Applies to single-family, owner-occupied homes.Deadline: Initial application required (sometimes completed at closing). Once applied, remains in effect until property transfers ownership.

Senior Citizens Homestead Exemption

Additional $5,000 EAV reduction on top of General Homestead Exemption

Additional property tax reduction for qualifying seniors age 65 and older

Eligibility: Property owner must be 65 years or older and occupy the property as their principal residence on January 1st of the assessment year.Deadline: Initial application required; automatically renewed annually thereafter

Senior Assessment Freeze Homestead Exemption

Freezes assessed value at the level from the year you first qualify, resulting in substantial savings over time as property values rise

Freezes property's taxable value at base year level, preventing future assessment increases from raising taxes

Eligibility: Must be 65 or older, have total household income at or below $75,000 for 2026 (increasing to $77,000 for 2027 and $79,000 for 2028), and have occupied home on two consecutive January 1st dates.Deadline: July 1, 2026 for 2026 tax year (payable 2027). Applications mailed to prior recipients around March 1, 2026.

Returning Veterans Homestead Exemption

$5,000 EAV reduction per year for first and second year after veteran returns from deployment

Two-year EAV reduction for veterans returning from active duty in armed conflict

Eligibility: Must have served on active duty in U.S. Armed Forces in an armed conflict. Available for two consecutive tax years following return from deployment.Deadline: Contact Winnebago County Supervisor of Assessments at (815) 319-4460

Standard Homestead Exemption for Veterans with Disabilities

30-49% disability: $2,500 EAV reduction; 50-69% disability: $5,000 EAV reduction; 70-100% disability: Complete property tax exemption (up to $250,000 EAV)

Provides tiered tax relief based on service-connected disability rating certified by U.S. Department of Veterans Affairs

Eligibility: Must own and occupy property, be Illinois resident who served in U.S. Armed Forces with service-connected disability of at least 30% certified by VA. Un-remarried surviving spouses may also qualify.Deadline: Annual renewal required each year. Initial application requires VA disability certification and DD-214.

Veterans with Disabilities Exemption for Specially Adapted Housing

Up to $100,000 reduction in assessed value

For veterans who received federal, state, or charitable funds to purchase or modify specially adapted housing

Eligibility: Must be total and permanent service-connected disabled veteran certified by U.S. Department of Veterans Affairs who received assistance for specially adapted housing modifications.Deadline: Initial application and annual renewal certified by Illinois Department of Veterans Affairs

Winnebago County Appeal Statistics

Avg Reduction

$700

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Frequently Asked Questions

What is the deadline to appeal my property taxes in Winnebago County for 2026?

The deadline to file a property tax appeal in Winnebago County is 30 calendar days after the assessments are published in local newspapers. Assessment notices are typically mailed to homeowners in the spring and reach residents by mid-May, with assessments generally published at the end of July. For the 2025 tax year, assessments were published on July 31, 2025, making the appeal deadline August 29, 2025. It is critical to watch for your assessment notice and mark your calendar immediately, as this deadline is statutory and cannot be waived, and late appeals will not be accepted by the Board of Review.

How do I file a property tax appeal in Winnebago County online?

To file a property tax appeal in Winnebago County, first contact your township assessor to attempt an informal resolution. If unsuccessful, you can obtain the Winnebago County Real Estate Assessment Complaint Form online at wincoil.gov/departments/supervisor-of-assessments/board-of-review. Complete all applicable sections of the form, including your property information and mailing address, and submit it along with supporting evidence such as comparable sales data, photographs, or appraisal reports. You can file online through the Board of Review website, mail the form to 404 Elm Street, Room 301, Rockford, IL 61101, or hand-deliver it to the same address within 30 calendar days of the assessment publication date.

What is the homestead exemption worth in Winnebago County?

The General Homestead Exemption in Winnebago County reduces your equalized assessed value (EAV) by up to $6,000, based on the increase above your property's 1977 EAV, whichever is less. For 2024 property taxes payable in 2025, this exemption provided approximately $569 in annual savings for homeowners in the City of Rockford. The exemption is not automatic and requires an initial application through the Winnebago County Supervisor of Assessments office, though it's sometimes completed at closing. Once applied for, the exemption remains in effect until the property transfers ownership, so you don't need to reapply annually.

What evidence do I need for a successful Winnebago County property tax appeal?

The strongest evidence for a Winnebago County property tax appeal includes recent comparable sales of similar properties, preferably within 12 months of the January 1 assessment date. You should also provide a professional appraisal report if available, photographs documenting property condition or defects, and repair estimates showing needed work. If you recently purchased the property near January 1, include your closing statement with the purchase price. Additionally, gather documentation of any factual errors in the assessor's property record card, such as incorrect square footage, wrong number of rooms, or unrecorded demolitions. The Board of Review values clear, objective, market-based evidence when making its determination.

How much can I save by appealing my property taxes in Winnebago County?

According to property tax appeal data, successful appeals in Winnebago County result in average tax bill reductions of approximately $700 annually. However, your potential savings depend on how overassessed your property is and the strength of your evidence. With Winnebago County's effective tax rate of 2.48%, every $25,000 reduction in assessed value saves you approximately $620 per year. Given that Winnebago County's median tax bill of $3,850 is substantially above the national median of $2,400, and the effective rate is more than twice the national average of 1.02%, even modest assessment reductions can provide meaningful long-term savings for homeowners facing one of Illinois's highest tax burdens.

What happens at a Winnebago County Board of Review hearing?

For properties requesting assessed value reductions under $33,333, a hearing before the Winnebago County Board of Review is optional unless you specifically request one. The Board will review your written evidence and send a notice of its preliminary determination to you and the township assessor. For properties requesting reductions of $33,333 or more in assessed value, you will be scheduled for a formal hearing in Room 301 at the Winnebago County Administration Building. During the hearing, you can present your evidence, including comparable sales data, appraisals, photographs, and expert testimony. The Board follows established rules and procedures and makes its determination based on the evidence presented, seeking to ensure fair and equitable property assessments.

Can I appeal to a higher authority if the Winnebago County Board of Review denies my appeal?

Yes, if you are dissatisfied with the Winnebago County Board of Review's decision, you can appeal to the Illinois Property Tax Appeal Board (PTAB) within 30 days of the date of the Board of Review's decision. PTAB is a state-level quasi-judicial body that provides an independent review of property assessments. Appeal forms are available from the Supervisor of Assessments office or at ptab.illinois.gov, and PTAB hearings can be held in Rockford or Springfield. You are not required to hire an attorney to represent yourself at PTAB. If you are still unsatisfied after PTAB review, you may ultimately appeal to circuit court as a final remedy for contesting your property assessment.

What is the Senior Assessment Freeze and how does it work in Winnebago County?

The Senior Assessment Freeze Homestead Exemption in Winnebago County freezes your property's taxable value at the base year level, preventing future assessment increases from raising your taxes. To qualify for 2026, you must be 65 or older, have total household income at or below $75,000 (increasing to $77,000 for 2027 and $79,000 for 2028), and have occupied your home on two consecutive January 1st dates. The freeze limits taxable value increases, which can result in substantial savings over time as property values rise throughout the county. Applications are due July 1, 2026, and are available from the Supervisor of Assessments at (815) 319-4460 or on the county website. Applications for 2026 (payable 2027) are mailed around March 1, 2026, to prior recipients.

Official Resources

Winnebago County Supervisor of Assessments Official Website →

Official county resource for assessment information, exemption forms, property records search, and Board of Review details.

Winnebago County Board of Review Information and Forms →

Access complaint forms, rules and procedures, hearing schedules, and filing information for property tax appeals.

Illinois Property Tax Appeal Board (PTAB) →

State-level appeal board for contesting Board of Review decisions, with forms, eFiling portal, and appeal status inquiry system.

Winnebago County Property Assessment Search →

Look up your property's assessed value, exemptions, and parcel information online using address or parcel number.

For state-wide appeal information including Illinois's assessment ratio and deadlines, see our Illinois Property Tax Appeal Guide →

Considering professional help with your appeal? Compare pricing, coverage, and pros/cons in our Best Property Tax Appeal Services (2026) or browse side-by-side service comparisons →

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← All Illinois property tax appeal info

Sources: https://wincoil.gov/departments/supervisor-of-assessments/ | https://wincoil.gov/departments/supervisor-of-assessments/board-of-review | https://www.appealdesk.com/appeals/illinois/winnebago | https://www.ptab.illinois.gov/ | https://www.tax-rates.org/illinois/winnebago_county_property_tax | https://taxbycounty.com/illinois/winnebago-county | https://worldpopulationreview.com/us-counties/illinois/winnebago-county

Last verified: 2026-07-22