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Updated 2025 Tax Year

Oconto County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
$3.583 per $1,000 of assessed value (county rate only - total varies by municipality and districts)
Exemptions
6+ Available
Section 1

How Property Tax Works

Oconto County, Wisconsin operates on a property tax system that funds essential local services including schools, county government operations, municipal services, and special districts. Property owners pay taxes based on their property's assessed value multiplied by the applicable tax rate, which varies by location within the county due to different combinations of taxing jurisdictions and special districts.

The 2025 property tax rate for Oconto County is $3.583 per $1,000 of assessed property value, representing a decrease from the previous year. However, your actual tax rate may differ depending on which municipality, school district, and special taxing districts (such as fire districts, library districts, or lake districts) serve your property. Property assessments in Wisconsin are based on fair market value as of January 1st each year, with no statewide assessment cap limiting annual increases.

Section 2

What Makes Up Your Tax Bill

ComponentRate (per $1,000)Description
County Base Levy$3.583Core county services, sheriff, courts, highways
Municipal LevyVariesCity/town/village services, varies by municipality
School District LevyVariesK-12 education, varies by school district
Technical College LevyVariesNortheast Wisconsin Technical College district
Special DistrictsVariesFire, library, lake, sanitary districts as applicable

Note: These rates apply to the 2025 levy year (taxes payable in 2025). Your total effective rate depends on which combination of taxing jurisdictions serve your property address. Special district assessments can significantly impact your total tax bill and vary widely by location within Oconto County.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Oconto 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 Oconto County are additional property tax bills issued when there are mid-year changes to property ownership, new construction completion, or significant property improvements that weren't reflected in the original assessment. These taxes cover the period from when the change occurred until the end of the current tax year.

Supplemental taxes are calculated by applying the current tax rate to the difference between the new assessed value and the previous assessed value, prorated for the remaining months in the tax year. For example, if you complete a $100,000 home addition in June and your total tax rate is $15 per $1,000 of assessed value, you would owe a supplemental tax of approximately $875 (($100,000 × $15/$1,000) × 7 months/12 months) covering June through December.

Example Calculation

$300,000 Home (assuming $15 total rate per $1,000 assessed value):

  • Assessed Value: $300,000
  • Less: Homestead Credit (if applied): -$1,000 typical reduction
  • Net Taxable Value: $299,000
  • Annual Tax: $299,000 × ($15/$1,000) = $4,485
  • Monthly Escrow: $374

$600,000 Home:

  • Assessed Value: $600,000
  • Less: Homestead Credit (if applied): -$1,000 typical reduction
  • Net Taxable Value: $599,000
  • Annual Tax: $599,000 × ($15/$1,000) = $8,985
  • Monthly Escrow: $749

$1,000,000 Home:

  • Assessed Value: $1,000,000
  • Less: Homestead Credit (if applied): -$1,000 typical reduction
  • Net Taxable Value: $999,000
  • Annual Tax: $999,000 × ($15/$1,000) = $14,985
  • Monthly Escrow: $1,249

Note: Tax credits require annual application and are not automatically applied. Actual rates vary by specific location within the county.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Oconto County require property tax escrow accounts, where you pay 1/12th of your estimated annual property tax bill with each monthly mortgage payment. Your lender collects these funds and pays your property taxes directly to the county when due. Lenders typically conduct an annual escrow analysis to adjust your monthly payment based on actual tax bills and any changes in assessed value.

Property taxes in Oconto County have a split payment schedule with the first installment due in December and the second installment due in January. Lenders usually make these payments on your behalf before the due dates to avoid late penalties. You can verify your tax payments and current balance through the county's online tax portal at https://www.co.oconto.wi.us/. If you don't have an escrow account, you're responsible for making these payments directly to your local municipality as required by state statute.

How HonestCasa Helps
  • Understand whether your escrow is set correctly
  • See how rising taxes will change your monthly payment
  • Plan ahead instead of being surprised by "shortage" letters
Section 6

Frequently Asked Questions

Q: When are property taxes due in Oconto County? A: The first installment is due in December, with the second installment due in January. You can also pay the full amount during either payment period.

Q: What tax credits are available and how do I apply? A: Wisconsin offers several tax credits including the Homestead Credit for qualifying homeowners. Most credits require annual application and are not automatic. Contact the Oconto County Assessor's office for available programs and application requirements.

Q: How does the Homestead Credit work? A: The Homestead Credit provides property tax relief for qualifying Wisconsin residents. It requires annual application through the Wisconsin Department of Revenue and can provide significant tax bill reductions based on income and property value. This is a credit that reduces your tax bill, not your assessed value.

Q: How often are properties reassessed? A: Wisconsin law requires properties to be assessed annually as of January 1st. Assessments should reflect fair market value, and there is no statewide cap on assessment increases.

Q: How can I appeal my assessment? A: You can appeal your assessment to the local Board of Review, typically meeting in May. Contact your municipal assessor for specific procedures and deadlines.

Q: What are the penalties for late payment? A: Late payments incur interest charges as specified by Wisconsin state statute. Contact the county treasurer for current penalty rates and policies.

Q: Can I pay my taxes online? A: Yes, Oconto County offers online tax payment through their web portal at https://www.co.oconto.wi.us/. Look for the "Pay Property Tax" link.

Q: Why do tax rates vary within the county? A: Your total tax rate depends on which municipality, school district, and special taxing districts (fire, library, lake districts) serve your property. These combinations create different total rates throughout the county.

Q: Do I need to apply for tax credits annually? A: Yes, most tax credits including the Homestead Credit require annual application. They are not automatically renewed or applied to your tax bill.

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