AppealDesk

Winnebago County Property Tax Appeal — Illinois

Rob HartleyRob Hartley·Updated March 5, 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 148,655. Major population centers include Loves Park, Machesney Park, Roscoe, and Belvidere. With an effective property tax rate of 2.78%, significantly higher than the national median of 1.02%, property tax appeals are particularly important for Winnebago County homeowners facing one of Illinois's highest tax burdens. The county's median annual tax bill of $3,116 is $716 above the national median, making successful appeals crucial for homeowners seeking relief from these elevated property taxes.

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

Median Home

$119,208

Tax Rate

2.78%

Annual Tax

$3,116

Population

285,350

2026 Appeal Deadline: 30 calendar days after assessments are published

The statutory deadline for filing appeals with the Winnebago County Board of Review is 30 calendar days after the assessments are published. For 2025, assessments were published on July 31, making the deadline August 29. Assessment notices are typically mailed in spring (by mid-May). Property owners should watch for their assessment notice to determine their specific filing deadline.

Property in Winnebago County, Illinois — local tax assessment and 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 by mid-May)

In Winnebago County, property taxes are based on your home's assessed value, which is 33.33% of the market value as required by Illinois statute. For example, if your home's market value is $119,000, your assessed value would be $39,667 (119,000 x 0.3333). At the county's effective tax rate of 2.78%, this would result in approximately $3,308 in annual property taxes before any exemptions are applied.

The Appeal Process

Appeals are heard by the Board of Review. For appeals requesting assessed value reductions under $33,333, the Board will send a preliminary determination notice and you can request a hearing if not satisfied. For larger reduction requests, you must appear before the Board unless you waive the hearing. Hearings are conducted in a fair and respectful manner, and you may present evidence and testimony to support your case.

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Step 1: Contact your township assessor first to discuss your assessment concerns informally. Many issues can be resolved at this level without filing a formal appeal, especially if there are factual errors in your property record.

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Step 2: If informal resolution is unsuccessful, obtain the Winnebago County Real Estate Assessment Complaint Form from the Board of Review website at wincoil.gov/departments/supervisor-of-assessments/board-of-review or from the Board of Review office at 404 Elm Street, Room 301.

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Step 3: Complete all applicable sections of the complaint form and gather supporting evidence such as recent comparable sales, professional appraisals, photographs showing property condition, or repair estimates demonstrating issues affecting value. Submit the original and one copy of both the complaint form and all written evidence.

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Step 4: File your completed appeal within 30 calendar days after assessments are published. Mail or hand-deliver to the Winnebago County Board of Review at 404 Elm Street, Room 301, Rockford, IL 61101. For properties requesting reductions under $33,333 in assessed value, a hearing is optional unless you request one.

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Step 5: Attend your Board of Review hearing if scheduled or required (mandatory for assessed value reduction requests of $33,333 or more). The Board will review your evidence and issue a decision. Hearings may be held in-person or virtually at the County Administration Building.

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Step 6: If dissatisfied with the Board of Review's decision, you can appeal to the Illinois Property Tax Appeal Board (PTAB) within 30 days of the Board's decision. PTAB forms are available from the Supervisor of Assessments office or at ptab.illinois.gov.

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Step 7: As a final option, if still dissatisfied after PTAB review, you may appeal to circuit court after exhausting administrative remedies.

Required form: Winnebago County Real Estate Assessment Complaint Form (year-specific)

Filing Methods

mail:Winnebago County Administration Building, 404 Elm Street, Room 301, Rockford, IL 61101
in-person:Winnebago County Administration Building, 404 Elm Street, Room 301 or 303, Rockford, IL 61101
email:bor@soa.wincoil.gov for certain submissions

Evidence to Bring

Recent comparable sales (within 12 months of January 1 assessment date)Professional appraisal reportPhotographs of property condition or defectsRepair estimates or contractor bidsClosing statements if recently purchasedProperty record card showing errors

Winnebago County Assessor Contact

Winnebago County Supervisor of Assessments / Board of Review

Phone: (815) 319-4460

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

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

Online Portal: https://assessor.wincoil.gov/search/

Hours: Monday through Friday, 8:00 AM - 5:00 PM

Tax Exemptions in Winnebago County

General Homestead Exemption

Up to $6,000 reduction in EAV (based on increase above 1977 EAV)

Reduces the equalized assessed value (EAV) for owner-occupied primary residences

Eligibility: Property owner must occupy the home as their principal dwelling place as of January 1 of the assessment yearDeadline: Initial application required; remains in effect until ownership change

Senior Citizen Homestead Exemption

$5,000 reduction in EAV

Provides additional tax relief for homeowners age 65 or older

Eligibility: Homeowner must be 65 years or older during the assessment year and occupy the property as their principal dwelling on January 1Deadline: December 31 of the assessment year

Senior Assessment Freeze Homestead Exemption

Freezes EAV increases above base year value (no cap on reduction amount)

Freezes the property's taxable value at the base year level for qualifying low-income seniors

Eligibility: Age 65+, total household income at or below maximum ($75,000 for 2026, $77,000 for 2027, $79,000 for 2028+), occupied home for 2 consecutive January 1st datesDeadline: July 1, 2026 for the 2026 (payable 2027) year

Veterans with Disabilities Exemption

$2,500 EAV reduction (30-49% disability), $5,000 (50-69% disability), or full exemption (70-100% disability)

Provides tax relief for disabled veterans based on disability percentage

Eligibility: Veteran with service-connected disability, proof required (VA award letter and DD 214 form), owner-occupied homes onlyDeadline: Initial application required; annual renewals sent to current recipients

Returning Veterans Homestead Exemption

$5,000 per year EAV reduction for first and second year after return

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

Eligibility: Veteran or spouse who owned the home after veteran returns from active duty in armed conflictDeadline: Contact Supervisor of Assessments at (815) 319-4460

Disabled Persons Homestead Exemption

$2,000 reduction in EAV annually

Provides tax relief for disabled homeowners

Eligibility: Disabled person must live in home as primary residence, pay property taxes, have ownership or legal interest, proof of total disability requiredDeadline: Initial application with proof required; annual renewals sent

Home Improvement Exemption

Up to $25,000 in EAV increase exempted for 4 years

Four-year exemption for assessment increases due to new improvements on existing homes

Eligibility: Single-family, owner-occupied homes receiving General Homestead Exemption; new improvements must increase assessed value (additions, patios, decks); must be 100% completeDeadline: Contact township assessor; reported by township assessors

Official Resources

Winnebago County Supervisor of Assessments Official Website →

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

Winnebago County Board of Review Information and Forms →

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

Winnebago County Property Search Tool →

Look up your property's assessed value, exemptions, and parcel information online.

Illinois Property Tax Appeal Board (PTAB) →

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

Winnebago County Appeal Statistics

Avg Reduction

$700

Check Your Winnebago County Assessment

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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. Assessment notices are typically mailed in the spring and reach homeowners by mid-May. For the 2025 tax year, assessments were published on July 31, 2025, making the appeal deadline August 29, 2025. It's critical to watch for your assessment notice and mark your calendar immediately, as this deadline is statutory and cannot be waived. Late appeals will not be accepted by the Board of Review.
How do I file a property tax appeal in Winnebago County?
To file a property tax appeal in Winnebago County, first contact your township assessor to attempt an informal resolution of any assessment errors. If unsuccessful, obtain the Winnebago County Real Estate Assessment Complaint Form from wincoil.gov/departments/supervisor-of-assessments/board-of-review or the Board of Review office. Complete all sections, gather supporting evidence like comparable sales or appraisals, and submit the original plus one copy to the Board of Review at 404 Elm Street, Room 301, Rockford, IL 61101, within 30 days of assessment publication. You can file by mail or in person.
What evidence do I need for a successful property tax appeal in Winnebago County?
The strongest evidence for a Winnebago County property tax appeal includes recent comparable sales of similar properties (preferably within 12 months of January 1 assessment date), a professional appraisal report, photographs documenting property condition or defects, and repair estimates showing needed work. If you recently purchased the property, include your closing statement with the purchase price dated near January 1. Also 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 values clear, objective, market-based evidence.
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. This translates to annual tax savings of approximately $167 for a typical homeowner at the county's 2.78% effective tax rate. Senior citizens age 65 and older receive an additional $5,000 EAV reduction (about $139 in annual savings). The exemption is automatic once you apply and remains in effect until the property changes ownership. Applications are available from the Supervisor of Assessments office at (815) 319-4460.
What happens at a Winnebago County Board of Review hearing?
At a Winnebago County Board of Review hearing, you will present your evidence and testimony to support why your property's assessment should be reduced. The hearing is conducted in a fair, impartial, and respectful manner at the County Administration Building (404 Elm Street, Room 301 or 303). The Board may also hear from your township assessor who can defend the current assessment. For appeals requesting assessed value reductions under $33,333, a hearing is optional unless you request one. For larger reduction requests, you must appear unless you waive the hearing. You may bring witnesses, such as appraisers, to testify on your behalf.
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 the county's 2.78% effective tax rate, every $25,000 reduction in assessed value saves you about $695 per year. Given that Winnebago County's median tax bill of $3,116 is $716 above the national median and the effective rate is nearly three times the national average, even modest assessment reductions can provide meaningful long-term savings for homeowners.
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 Board of Review's decision date. 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. PTAB hearings can be held in Rockford, and you are not required to hire an attorney to represent yourself. If still unsatisfied after PTAB review, you may ultimately appeal to circuit court as a final remedy.
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. There is no cap on the amount of tax reduction. The freeze limits taxable value increases, which can result in substantial savings over time as property values rise. Applications are due July 1, 2026, and are available from the Supervisor of Assessments at (815) 319-4460.

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/board-of-review | https://www.ownwell.com/trends/illinois/winnebago-county | https://wincoil.gov/departments/supervisor-of-assessments/exemption-forms-information | https://en.wikipedia.org/wiki/Winnebago_County,_Illinois | https://www.ptab.illinois.gov/

Last verified: 2026-03-05