Winnebago Tax Assessment Search & Values

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Winnebago County, Illinois · PIN · Township Assessment · EAV · Tax Records · 2026

Search a Winnebago Assessment, Then Trace the Value to the Tax Bill

Winnebago County property assessment records can be searched by Parcel Identification Number, property location or owner name. The useful part starts after the result opens: identifying the township, choosing the right assessment year, reading the assessed value and understanding why the tax bill may show a different taxable value.

Illinois also separates the jobs among township assessors, the County Supervisor of Assessments, Board of Review, Treasurer and County Clerk. This page routes each task to the office that actually controls it.

Start with the quick answer Search the assessment Understand the value
Location check: this guide covers Winnebago County, Illinois, including the Rockford-area county property system. It does not cover Winnebago County, Wisconsin or Winnebago County, Iowa.

Quick answer: start with the Supervisor of Assessments Parcel Inquiry

Use the official Winnebago County Parcel Details Inquiry to search current assessment information and historical records back through 2003. You can search by PIN, property location or owner name.

1 Find parcel PIN, address or owner name.
2 Open record Confirm parcel and assessment year.
3 Read value Assessment, EAV and exemptions.
4 Finish task Map, appeal, bill or payment.

Useful Winnebago County facts before you search

County assessment office Supervisor of Assessments
Supervisor Thomas Hodges
Assessment phone 815-319-4460
Property search Current + history through 2003
Normal Illinois level 33⅓% of fair cash value
2026 values online July 31, 2026
2026 notices Mailed August 3
Tax Treasurer Theresa Grennan
Tax phone 815-319-4400
County offices 404 Elm St., Rockford
Search official assessment records Search official tax records Open WinGIS property map

Choose the property task you need to finish

Winnebago County does not use one office for assessment, tax collection, appeals and recorded deeds. Pick the task first, then use the matching record.

Illinois office routing

Township assessor, Supervisor, Treasurer and Board of Review do different jobs

T
TOWNSHIP ASSESSOR Initial value
Property facts
Informal review
S
SUPERVISOR County records
Equalization
Exemptions
B
BOARD OF REVIEW Formal complaint
Evidence
Decision
$
TREASURER Tax bill
Payment
Current tax record
C
COUNTY CLERK Tax extension
Rates
Sold-tax redemption
Which Winnebago County office should you use?
Your question
Best office
Why
Why did my property’s assessment change?
Township Assessor
Township assessors handle the initial parcel valuation and property-record details.
Where do I search county assessment records?
Supervisor of Assessments
The county Parcel Inquiry maintains current and historical assessment information.
Is my homestead or senior exemption on the account?
Supervisor of Assessments
The office processes and maintains homestead exemption records.
How do I formally dispute the assessment?
Board of Review
The Board hears timely formal property-assessment complaints.
What do I owe and has my payment posted?
County Treasurer
The Treasurer maintains the current tax inquiry and payment system.
My older taxes were sold at tax sale.
County Clerk
Sold-tax redemption is handled by the Clerk rather than the Treasurer website.
If you think the value itself is wrong: Winnebago County’s Treasurer guidance tells property owners to begin with their township assessor. The assessor’s name and phone number also appear on the property-tax bill.
Find your township assessor
No-result troubleshooting

If the Winnebago parcel search does not find the property

PIN search fails Recheck all four PIN segments against the tax bill or prior county record. Do not guess a missing digit.
Address returns nothing Reduce the search to the strongest street information. Try the WinGIS map, which specifically advises omitting street direction and suffix in its address search.
Owner search fails Start with the last name only. A recent purchase may still require searching the former owner and then checking the recorded deed.
Vacant land has no useful address Use the PIN or locate the parcel visually in WinGIS.
Parcel was split or combined Compare the current PIN against older tax or deed records rather than assuming the old number remains active.
Property details look wrong Note the exact field—such as size, class or improvement—and contact the township assessor before filing a formal complaint.
WinGIS address shortcut: its current Property Search tells users to omit the street direction and suffix—for example, search “127 Wyman” rather than adding a direction and “St.”
Illinois assessment math

For most Winnebago property, assessed value targets one-third of fair market value

Illinois law generally requires property outside Cook County to be assessed at 33⅓% of fair cash value. Winnebago County then uses equalization factors when necessary so township assessment levels remain aligned with that legal standard.

1. Fair market value Approximate open-market value as of January 1 of the assessment year.
2. Assessed value For most non-farm property, roughly one-third of fair market value.
3. Equalized assessed value Township or state equalization can adjust the assessment to the statutory level.
4. Taxable value Eligible exemptions reduce the taxable EAV before tax rates are applied.
Winnebago County assessment terms
Term
What it means
What to do with it
Fair cash value
The property’s market-value standard under Illinois property-tax law.
Use comparable open-market sales when questioning it.
Assessed value
For most non-farm real estate, approximately 33⅓% of fair market value.
Compare like properties in the same assessment year.
Equalization factor
A multiplier used to bring assessment levels to the statutory 33⅓% standard.
Do not treat the multiplier itself as evidence that your home’s market value changed by the same percentage.
EAV
Equalized Assessed Value after applicable equalization.
Use this as the starting point for exemptions and taxable value.
Taxable value
Value remaining after applicable exemptions.
This is more directly connected with the tax calculation.
Farm property is different. Illinois farmland is assessed under agricultural productivity rules rather than the ordinary one-third market-value method used for most residential and commercial real estate.
Equalization is not a property-value increase by itself. Winnebago County explains that a factor measures how assessment levels compare with the legal one-third standard; it is not a direct measure of how much an individual property’s market value changed.
Read Winnebago equalization explanation
Year-matching rule

A 2026 assessment is not the tax bill you paid in 2026

Winnebago County collects property taxes one year after the assessment year. The bills mailed in May 2026 were for the 2025 tax year. The current 2026 assessment year feeds the tax-extension process that continues into 2027.

2025 assessment Property was valued for tax year 2025.
March 30, 2026 County completed the 2025 tax extension.
May 2026 Treasurer mailed 2025 property-tax bills.
2026 assessment New values went online July 31 and notices were mailed August 3.
2027 payable year Taxes based on the 2026 assessment are calculated and collected later.
Useful comparison rule: if you are deciding whether the new 2026 value is reasonable, compare 2026 assessments with 2026 assessments. Do not use the 2025 tax bill as though it were a 2026 assessment notice.
The County Clerk is currently publishing estimated 2026 EAV reports. Those reports continue to be updated before the 2026 tax extension, which is expected around mid-March 2027.
Value calculator

Convert a Winnebago assessed value into a rough market-value check

Illinois one-third calculator

Enter the parcel’s assessed value, any exemption amount you want to model and an example tax rate. The calculator estimates the corresponding market value using the standard one-third relationship.

This is a screening tool, not an official assessment or tax quote. Township equalization, state equalization, exemptions, special assessments and parcel-specific tax codes can change the final numbers.

Approx. market value $225,000
Example taxable EAV $69,000
Example tax $6,900

Approximate market value = assessed value × 3. Example taxable EAV = assessed value − entered exemption. Example tax = taxable EAV × entered rate ÷ 100.

WinGIS property map

Use WinGIS when the parcel number or location is easier to identify on a map

WinGIS provides a dedicated Winnebago Property Search map with parcel layers and property information. It supports searching by address or PIN and can be useful for vacant land, neighboring parcels and location checks.

Open Winnebago Property Search Use the WinGIS public property map rather than a generic map service.
Search an address or PIN For addresses, WinGIS instructs users to omit street direction and suffix—for example, “127 Wyman.”
Select the parcel Open the parcel details and copy the PIN before leaving the map.
Return to the assessment record Use the PIN in the Supervisor of Assessments Parcel Inquiry to review the assessment-year history.
Open WinGIS Property Search
Map use: parcel mapping is useful for identification and research. For an exact legal boundary or boundary dispute, use recorded documents and a professional survey rather than relying only on an online parcel line.
Check before blaming the assessment

An exemption can change taxable value without changing the property’s market value

Winnebago County’s Supervisor of Assessments maintains homestead exemptions. If a tax bill looks unexpectedly high, check whether the expected exemption is actually present before assuming the underlying appraisal is wrong.

General Homestead For qualifying owner-occupied residential property. In counties such as Winnebago, the Illinois statewide maximum reduction is generally $6,000 of EAV.
Senior Homestead Qualifying homeowners age 65 or older can receive the Illinois senior homestead reduction.
Senior Assessment Freeze For 2026, qualifying household income is $75,000 or less under current Illinois rules. Winnebago County’s 2026 filing deadline was July 1.
Disability / Veteran Programs Separate Illinois exemptions exist for qualifying persons with disabilities and veterans with service-connected disabilities.
A senior “freeze” does not freeze the tax bill. The program freezes qualifying EAV at a base level. The actual bill can still change if tax rates rise or taxable improvements are added.
Current misinformation warning: the Winnebago County Supervisor of Assessments specifically warns residents that there is no nationwide federal senior property-tax freeze, no federal 3% assessment cap, no automatic school-tax exemption for Social Security recipients and no federal October 15, 2026 filing deadline for those claims.
Check Winnebago exemption forms
Current as of September 2026

The ordinary 2026 Winnebago Board of Review complaint deadlines have passed

Winnebago County published 2026 assessments at the beginning of August. The complaint deadline depended on the township’s publication date, so there was not one single countywide deadline.

2026 Winnebago County assessment complaint dates
Township group
Publication
Complaint deadline
Additional evidence if reduction < $100,000
Additional evidence if reduction ≥ $100,000
Cherry Valley, Durand, Laona, Owen, Rockford
Aug. 5, 2026
Sept. 4, 2026
Sept. 29, 2026
Oct. 14, 2026
Burritt, Harlem, Harrison, Pecatonica, Rockton, Roscoe, Seward, Shirland, Winnebago
Aug. 6, 2026
Sept. 5, 2026
Sept. 30, 2026
Oct. 15, 2026
If you did not file by Sept. 4 or Sept. 5: do not treat the later evidence dates as a new filing opportunity. Those later dates apply to supporting evidence for complaints that were filed on time.

If you already filed a 2026 complaint

Confirm which township group controls your evidence deadline.
Check the exact reduction requested on the complaint.
Submit comparable-sales or appraisal evidence by the applicable date.
Keep copies of everything sent to the Board of Review.
Watch for hearing or decision correspondence.
Read the decision immediately if considering a state appeal.
Next level after the Board: Winnebago County states that a taxpayer dissatisfied with the Board of Review decision may appeal to the Illinois Property Tax Appeal Board. The PTAB appeal must generally be postmarked within 30 days of the Board of Review decision.
Open current Board of Review information Illinois Property Tax Appeal Board
2025 taxes payable in 2026

The second 2026 installment deadline was September 11

Winnebago County mailed the 2025 property-tax bills in early May 2026. The two installment deadlines were June 12 and September 11, 2026.

Current timing: as of September 12, 2026, the ordinary second-installment deadline has passed. The Treasurer states that late taxes are subject to a 1.5% penalty per month. Check the live parcel tax record for the exact balance rather than calculating a penalty yourself.
Current Winnebago County payment information
Payment item
Current County guidance
What to do
e-Check / ACH
No online payment fee
Use the Treasurer’s official parcel tax system.
Debit / credit card
2.25% payment-servicer fee
Review the amount before confirming payment.
Mail
404 Elm Street, Room 205, Rockford, IL 61101
The Treasurer says its former PO Box was closed in 2024.
2024 or older unpaid taxes
Cannot be paid through the current Treasurer website
Contact the County Clerk at 815-319-4253.
Returned check
$35 county returned-check charge
Bank fees may also apply separately.
Check current parcel tax record Read Treasurer payment guidance
Official Rockford offices

Winnebago County assessment and tax contacts

Supervisor of Assessments

Supervisor Thomas Hodges
Address
404 Elm Street, Room 301, Rockford, IL 61101
Phone 815-319-4460
Hours Monday–Friday, 8:00 a.m.–5:00 p.m.
Best for Assessment records, equalization, exemptions, tax maps and Board of Review routing.
Official assessment office

Tax and appeal contacts in the same county building

Winnebago County property-tax contacts
Office
Location
Phone
Best reason to call
Supervisor of Assessments
404 Elm St., Room 301
815-319-4460
Assessment records, exemptions, equalization and assessment administration.
Board of Review
404 Elm St., Room 301
815-319-4463
Complaint deadlines, evidence and hearing questions.
County Treasurer
404 Elm St., Room 205
815-319-4400
Current tax bills, payments, penalties and tax-account questions.
County Clerk Tax Extension / Redemption
404 Elm St., Room 101
815-319-4253
Tax rates, extension and redemption of sold delinquent taxes.
For a value dispute, bring the right details: PIN, physical address, township, assessment year, the exact value or property characteristic you question, and any comparable sales or factual evidence.
Local terminology

Winnebago assessment terms you will see in county records

PIN Parcel Identification Number used to identify the real-estate parcel.
Fair Cash Value Illinois market-value standard used in ordinary real-property assessment.
Assessed Value For most non-farm property, approximately one-third of fair cash value.
EAV Equalized Assessed Value after applicable equalization factors.
Township Assessor Local assessor who handles initial assessment work and property-record review.
Board of Review County board that hears timely formal complaints about property assessments.
10 Winnebago-specific answers

Winnebago tax assessment search and values FAQs

1. Where can I search Winnebago County, Illinois property assessments?

Use the official Winnebago County Supervisor of Assessments Parcel Details Inquiry at assessor.wincoil.gov. The portal searches by PIN, parcel location or owner name and provides current and historical parcel information through 2003.

2. Can I search a Winnebago County assessment by owner name?

Yes. The official Parcel Inquiry provides separate Last Name and First Name fields. If the full name returns nothing, start with the surname and verify the parcel address after opening a result.

3. What does 33⅓% mean on a Winnebago County assessment?

For most non-farm Illinois property outside Cook County, assessed value is intended to equal one-third of fair market value. A $75,000 assessed value therefore corresponds roughly to a $225,000 market value before equalization or special valuation issues are considered.

4. What is EAV on a Winnebago County property record or tax bill?

EAV means Equalized Assessed Value. Equalization factors can adjust assessments so township and county assessment levels meet Illinois’s statutory 33⅓% standard. Applicable exemptions are then used to determine taxable value.

5. Is the 2026 assessment the same tax bill I paid in 2026?

No. Winnebago County collects taxes one year in arrears. The bills mailed in May 2026 were for tax year 2025. The 2026 assessment will feed the tax process for taxes payable in 2027.

6. Who should I call if I think my Winnebago assessment is too high?

Start with the township assessor responsible for the parcel. Winnebago County’s Treasurer guidance recommends discussing an inaccurate assessment with the township assessor before pursuing the formal Board of Review process.

7. Can I still file a normal 2026 Winnebago County assessment complaint?

The ordinary 2026 complaint deadlines were September 4 for Cherry Valley, Durand, Laona, Owen and Rockford townships, and September 5 for the county’s other listed townships. Those filing deadlines have passed.

8. If I already filed a 2026 complaint, when is additional evidence due?

For the September 4 township group, the additional-evidence dates are September 29 for reduction requests below $100,000 and October 14 for requests of $100,000 or more. For the September 5 group, the corresponding dates are September 30 and October 15.

9. Where do I check my current Winnebago County property-tax balance?

Use the Treasurer’s Parcel Tax Details Inquiry at taxes.wincoil.gov. It searches by PIN, property location or owner name and provides current and historical tax information through 2003.

10. What were the Winnebago County property-tax due dates in 2026?

The 2025 tax bills payable in 2026 had installment due dates of June 12 and September 11, 2026. The Treasurer states that late payments are subject to a 1.5% monthly penalty, so use the live tax record for the exact current amount due.

Official Winnebago County property resources

Independent property-information guide: CountyAuditors.org is not Winnebago County, a township assessor, the Supervisor of Assessments, Board of Review, Treasurer, County Clerk, WinGIS or the Illinois Department of Revenue. Property-search data is useful for assessment and tax research but does not replace a recorded deed, legal survey, official tax payoff, appraisal or legal advice. Verify parcel-specific balances, exemptions, appeal deadlines and legal property information with the responsible public office before acting.
Ohio Auditor Tools · Tax Year 2026

10 Ohio Property Tax Calculators & Auditor Tools

Built specifically for Ohio's 35% assessment ratio, current DTE forms, and 2026 Homestead, Owner-Occupancy, CAUV, Conveyance Fee, and Board of Revision rules. Every number reflects verified Ohio Department of Taxation amounts.

Homestead: $29,000 Enhanced Vet: $58,000 OAGI limit: $41,000 Assessment: 35% of market BOR filing: Free · DTE 1

Annual Tax Bill Estimator

OHIO

Applies Ohio's 35% assessment ratio plus your county's effective millage tier — the actual math your auditor uses.

Pick a county tier and enter your market value.

Homestead Reduction Calculator

DTE 105A

2026 Ohio Homestead: $29,000 general or $58,000 enhanced (100% disabled vet, KIA spouse). OAGI under $41,000 required for non-veteran applicants.

Pick your situation and enter your home value.

Owner-Occupancy & Non-Business Credits

DTE 105C

Every Ohio owner-occupied home qualifies for the 2.5% Owner-Occupancy Credit plus the automatic 10% Non-Business Credit. Most owners don't realize these stack.

Enter your annual tax to see both credit amounts.

Conveyance Fee Calculator

ORC 322

When you sell or transfer Ohio property, the auditor collects $1 state + up to $3 county per $1,000, plus $0.50 per parcel. Counties choose their rate.

Enter sale price and pick your county rate.

CAUV Agricultural Savings

DTE 109

Ohio's Current Agricultural Use Value cuts taxable value dramatically for farmland (10+ acres, or smaller with $2,500+ annual gross income).

Enter both market and CAUV values to see savings.

Mill Rate Converter

Ohio tax rates appear three ways on auditor sites: mills, percent, or dollars per $1,000. Convert between them instantly.

Enter a rate to see all three forms.

Parcel Number Cleaner

Ohio's 88 counties each format parcels differently — Franklin uses 010-123456-00, Cuyahoga uses 001-23-456, Hamilton uses 100-0001-0001-00. Auto-detects.

Paste any Ohio county parcel to format it.

35% Ratio Sanity Check

Ohio law sets taxable value at 35% of market value. If yours is significantly higher, you're a strong BOR appeal candidate.

Enter both values to compare against Ohio's 35% target.

BOR Appeal Savings

DTE 1

A successful Board of Revision complaint typically cuts your value 10–20%. Filing is free and stays in effect until the next reappraisal.

Enter your tax bill and reduction estimate.

BOR Deadline Countdown

MAR 31

Ohio's statutory Board of Revision filing deadline is March 31 for the prior tax year. Miss it and you wait until next year — no extensions.

Set your deadline to start the countdown.

Verify with the official Ohio source

These calculators use the verified 2026 Ohio Department of Taxation amounts and statutory rules. For your exact bill, exemption status, and county-specific deadlines, always confirm with your county auditor and the Ohio Revised Code:

Ohio Dept. of Taxation — Real Property DTE Forms (105A, 105C, 1, 109) ORC 5715 — Board of Revision ORC 5713 — Taxable Real Property ORC 322.02 — Conveyance Fee ORC 319.54(F)(3) — State Fee ORC 5713.30 — CAUV tax.ohio.gov — Main Portal

Estimates use Ohio's 35% statutory assessment ratio and effective tax rate tiers averaged across major Ohio counties. Your actual bill depends on local school levies, voted millage, inside vs. outside millage splits, House Bill 920 reduction factors (HB 920), and special assessments. The 2026 Homestead general amount ($29,000) and enhanced amount ($58,000) reflect HB 187 inflation indexing — your county auditor's office may show slightly different transitional figures. Nothing here is legal or tax advice. CountyAuditors.org is an independent informational directory, not affiliated with any county government.

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