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Updated 2025 Tax Year

Marathon County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
1.8% to 2.4% of assessed value, varies by taxing district and municipality within Marathon County
Exemptions
5+ Available
Section 1

How Property Tax Works

Marathon County, Wisconsin operates under the state's property tax system to fund essential services including county government operations, schools, and local municipalities. Property taxes in Marathon County are assessed annually based on the fair market value of real estate as of January 1st, with taxes levied in December for the following tax year. The county's effective tax rate typically ranges from approximately 1.8% to 2.4% of assessed value, though this varies significantly based on your specific location within the county.

Actual tax rates differ throughout Marathon County due to varying special taxing districts, including school districts, technical college districts, municipal services, and special assessments for infrastructure improvements. Rural areas may have different rate structures than urban areas like Wausau, and properties may be subject to additional levies for services like fire protection districts or sanitary districts. The total tax bill represents the combination of county, municipal, school district, and any applicable special district taxes.

Section 2

What Makes Up Your Tax Bill

ComponentRate (per $1,000)Description
County General$3.45Basic county services, administration, public safety
School Districts$8.50-$12.20Varies by school district (Wausau, D.C. Everest, etc.)
Municipal/Town$2.80-$6.15City/town services, varies by municipality
Technical College$1.85North Central Technical College district
Special Districts$0.50-$3.00Fire, sanitary, library districts where applicable
Total Estimated Range$16.10-$27.65Varies significantly by location

Rates shown are estimates for levy year 2024-2025 and vary considerably based on specific taxing districts within Marathon County. Properties in the City of Wausau will have different rates than rural township properties. Contact the Marathon County Assessor's office for precise rates applicable to your property's specific location and taxing districts.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Marathon 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 Marathon County are additional property tax bills issued when there are significant changes to a property after the January 1st assessment date but before the December tax levy. Common triggers include new construction completion, property improvements with building permits, or ownership changes that reveal previously unassessed improvements. The supplemental tax covers the difference between the original assessment and the new assessed value, prorated for the remaining portion of the tax year.

For example, if you complete a $50,000 home addition in June that wasn't captured in the January assessment, you may receive a supplemental tax bill in late summer. The additional tax would be calculated on the $50,000 increased value using your property's applicable tax rate, then prorated for the 7 months remaining in the tax year (June through December), resulting in approximately 58% of the full annual tax on that improvement.

Example Calculation

Example 1: $300,000 Home

  • Assessed Value: $300,000
  • Less: Homestead Credit (est.): -$1,200
  • Net Taxable Value: $298,800
  • Tax Rate: $20.50 per $1,000
  • Annual Tax: $6,125
  • Monthly (if escrowed): $510

Example 2: $600,000 Home

  • Assessed Value: $600,000
  • Less: Homestead Credit (est.): -$1,200
  • Net Taxable Value: $598,800
  • Tax Rate: $22.15 per $1,000
  • Annual Tax: $13,262
  • Monthly (if escrowed): $1,105

Example 3: $1,000,000 Home

  • Assessed Value: $1,000,000
  • Less: Homestead Credit (est.): -$1,200
  • Net Taxable Value: $998,800
  • Tax Rate: $24.80 per $1,000
  • Annual Tax: $24,770
  • Monthly (if escrowed): $2,064

Examples use estimated tax rates and assume qualification for homestead credit, which requires annual application. Actual rates vary by specific taxing districts within Marathon County.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Marathon County require property tax escrow accounts for loans with less than 20% down payment. Your lender collects monthly tax payments along with principal and interest, depositing funds into an escrow account. The lender pays your property taxes directly to Marathon County when due - typically in two installments due in April and July. Lenders must provide annual escrow statements showing payments, disbursements, and account balances.

If your property taxes increase, your lender will adjust your monthly payment at the annual escrow review. You may receive an escrow shortage notice requiring additional payments to cover deficits. Conversely, overpayments may result in refunds or reduced monthly payments. Property owners without escrow accounts are responsible for making payments directly to the Marathon County Treasurer by the specified due dates to avoid penalties and interest charges.

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 Marathon County property taxes due for the 2024-2025 tax year? A: The first installment is typically due by April 30th, and the second installment is due by July 31st. Late payments become delinquent and subject to penalties and interest.

Q: What tax credits are available and do they apply automatically? A: Wisconsin offers several tax credits including the Homestead Credit for qualifying homeowners. These credits require annual application and are NOT automatic. Applications must be filed with the Wisconsin Department of Revenue, typically by July 31st for the current tax year.

Q: How does the Homestead Credit work? A: The Homestead Credit helps limit property tax increases for qualifying Wisconsin residents by capping assessment increases, not reducing market value. You must apply annually and meet income and residency requirements. This credit can provide significant tax relief but requires timely application to the state.

Q: How often are properties reassessed in Marathon County? A: Wisconsin law requires property to be assessed annually as of January 1st. However, physical inspections may occur on a rotating basis. You can appeal your assessment through the Board of Review process, typically held in May.

Q: What penalties apply for late property tax payments? A: Late payments incur interest charges and penalties. After July 31st, unpaid taxes become delinquent and additional collection fees apply. Properties with multiple years of unpaid taxes may face tax deed proceedings.

Q: Can I pay property taxes online? A: Yes, Marathon County offers online payment options through their official website. You can pay by electronic check or credit card, though convenience fees may apply for credit card payments.

Q: Why did my tax bill increase when my assessment stayed the same? A: Tax bills can increase due to higher tax rates from county, municipal, school district, or special district levy increases, even when your property's assessed value remains unchanged.

Q: What special district taxes might apply to my property? A: Depending on location, your property may be subject to additional taxes for fire protection districts, sanitary districts, library districts, or special improvement districts. These vary significantly throughout Marathon County and appear as separate line items on your tax bill.

Q: How do I find out which taxing districts apply to my property? A: Contact the Marathon County Assessor's office or check your most recent property tax statement, which lists all applicable taxing districts and their individual tax amounts for your specific property location.

Q: Are there property tax benefits for seniors or veterans? A: Wisconsin offers various programs including the School Levy Tax Credit and potential veteran exemptions. Most require separate applications and have specific eligibility requirements. Contact the Marathon County Veterans Service Office or Wisconsin Department of Revenue for current programs and application procedures.

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