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Updated 2025 Tax Year

Oneida County
Property Tax Guide

Everything you need to know about property taxes in Oneida County, WI. Rates, due dates, exemptions, and how it affects your monthly payment.

10 Official Sources
8 min read
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Quick Facts
Tax Rate
Varies by location due to combined county, municipal, school district, and special district levies
Exemptions
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Section 1

How Property Tax Works

Oneida County, Wisconsin operates under a property tax system that serves as the primary funding mechanism for local government services, including county operations, schools, municipal services, and special districts. Property taxes in Oneida County fund essential services such as law enforcement, road maintenance, public health services, and educational programs. The county has demonstrated fiscal responsibility by maintaining property tax levies without increases for twelve consecutive years through 2025.

Property tax rates in Oneida County vary by location within the county due to different combinations of taxing jurisdictions, including the county levy, municipal levies, school district assessments, and special district charges. The effective tax rate is influenced by your specific location and the various taxing entities that serve your property. Wisconsin uses a fair market value assessment system, with Oneida County currently applying an assessment ratio of 0.617805011 to calculate estimated fair market values displayed on tax bills.

Section 2

What Makes Up Your Tax Bill

ComponentRateDescription
County LevyVaries by districtFunds county services, sheriff, courts, health services
School DistrictVaries by districtLocal school operations and debt service
Municipal LevyVaries by municipalityCity, village, or town services
Technical CollegeStatewide rateNicolet Area Technical College assessment
Special DistrictsVaries by locationFire districts, sanitary districts, lake districts

Note: These rates apply to the 2025 tax levy year. The 2025 Oneida County budget was approved with no property tax increase for the twelfth consecutive year. Actual combined rates vary significantly by property location within the county due to different combinations of overlapping taxing jurisdictions.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Oneida County, property taxes are due in two installments:

Pro tip: If you pay through mortgage escrow, your lender splits these payments across your monthly mortgage. If you pay directly, set calendar reminders to avoid late penalties.
Section 4

Supplemental Tax Bills

Supplemental taxes in Oneida County are additional property tax assessments that occur when there are changes to property ownership, new construction, or significant improvements made to existing properties during the tax year. These taxes are calculated based on the difference between the original assessed value and the new assessed value, prorated for the portion of the tax year the higher assessment applies.

For example, if you complete a home addition worth $50,000 in July, you would receive a supplemental tax bill for the increased assessment covering July through December. The supplemental tax would be calculated as: ($50,000 × applicable tax rate) × (6 months ÷ 12 months). Supplemental taxes have the same due date as regular property taxes and are subject to the same penalty structure for late payments.

Example Calculation

Example 1: $300,000 Property Value

  • Assessed Value: $300,000
  • Less: Homestead Credit (if applicable): -$3,000
  • Net Taxable Value: $297,000
  • Annual Tax (est. 1.8% effective rate): $5,346
  • Monthly Escrow: $445

Example 2: $600,000 Property Value

  • Assessed Value: $600,000
  • Less: Homestead Credit (if applicable): -$3,000
  • Net Taxable Value: $597,000
  • Annual Tax (est. 1.8% effective rate): $10,746
  • Monthly Escrow: $896

Example 3: $1,000,000 Property Value

  • Assessed Value: $1,000,000
  • Less: Homestead Credit (if applicable): -$3,000
  • Net Taxable Value: $997,000
  • Annual Tax (est. 1.8% effective rate): $17,946
  • Monthly Escrow: $1,496

Note: Tax credits shown require application and approval. Actual tax rates vary by specific location within Oneida County due to different taxing districts.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Oneida County require property tax escrow accounts for borrowers with less than 20% equity. Your lender collects monthly escrow payments equal to 1/12th of your annual property tax bill plus insurance premiums. Lenders typically maintain a cushion of 1-2 months of payments in your escrow account to ensure sufficient funds are available when taxes are due.

Property taxes in Oneida County are due January 31st for the first installment, with the second installment typically due later in the year. Your lender will receive tax bills directly from the county and make payments on your behalf. You should receive an annual escrow analysis from your lender showing the account activity and any adjustments needed for the coming year. It's important to verify that your lender has paid your taxes on time, as you remain ultimately responsible for ensuring payment even when using an escrow account.

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Section 6

Frequently Asked Questions

Q: When are property taxes due in Oneida County for 2026? A: The first installment or full payment is due by January 31, 2026. Online payments are unavailable from mid-November to early February during the billing transition period.

Q: What tax credits are available and how do I apply? A: Wisconsin offers several tax credits including the Homestead Credit for income-qualified homeowners, Senior/Disabled Person Property Tax Credit, and Veterans Disability Credit. All credits require annual application through the Wisconsin Department of Revenue and are not automatic.

Q: How does the Homestead Credit work? A: The Homestead Credit limits annual assessment increases rather than reducing market value. It caps assessment growth and requires filing an annual application with income documentation. Contact the Wisconsin Department of Revenue for current income limits and application deadlines.

Q: When are properties reassessed in Oneida County? A: Wisconsin law requires municipalities to assess property annually or maintain assessments at market value. Assessment notices are typically mailed in spring, with appeal deadlines clearly stated on the notice.

Q: What are the penalties for late payment? A: Late payments incur interest charges and penalties as specified by Wisconsin state law. Contact the Oneida County Treasurer's office for current penalty rates and payment options.

Q: Can I pay my property taxes online? A: Yes, but online payments are unavailable from mid-November to early February during the annual billing cycle. Check the Oneida County website for current payment options and accepted methods.

Q: Why do tax rates vary within Oneida County? A: Different areas are served by different combinations of school districts, municipalities, fire districts, and other special taxing jurisdictions, resulting in varying total tax rates across the county.

Q: Is there property tax relief for seniors and disabled individuals? A: Yes, Oneida County offers a 50% property tax exemption for qualifying seniors and individuals with disabilities, with income limits that were recently increased by $11,000. Applications are required and must be filed with the county assessor.

Verified Sources

Backed by 10 Official Government Sources

Every fact in this guide is sourced from official county, state, and federal documents.

01
County
2025 Statement of Assessment for 5soaoneida Countyrevenue.wi.gov
02
State
2025 Real Estate Equated Assessment Roll for Oneida ...revenue.wi.gov
03
County
Treasurer – Oneida County, WIoneidacountywi.gov
04
Tax Doc
Tax Payment Informationtownofthreelakeswi.gov
05
Tax Doc
Property Taxesnewboldwi.gov
06
COURT OF APPEALSwicourts.gov
07
County
Oneida County Increases Tax Exemption Eligibility for Low ...oneidacountyny.gov
08
DOR Homestead Credit - Wisconsin Department of Revenuerevenue.wi.gov
09
County
ONEIDA COUNTY, WISCONSINoneidacountywi.gov
10
Fiscal Estimatedocs.legis.wisconsin.gov
All sources verified as of 2025 Tax Year

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