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Updated 2025 Tax Year

Green Lake County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
Varies by location within county, around 1% statewide average but differs by school district and municipality combinations
Exemptions
4+ Available
Section 1

How Property Tax Works

Green Lake County, Wisconsin operates under a property tax system that funds essential local services including schools, county government operations, emergency services, and infrastructure maintenance. The county uses an assessment ratio of 0.948354156 for the 2025 tax year, with property taxes serving as the primary funding mechanism for local governmental services.

Property tax rates in Green Lake County vary significantly by location within the county due to different combinations of taxing jurisdictions. Your actual tax rate depends on which school district, municipality, technical college district, and special assessment districts your property falls within. The Wisconsin state average property tax rate is approximately 1%, but Green Lake County rates may differ based on your specific taxing district combination. Property tax bills are typically mailed out in mid-December once all taxing jurisdiction information has been compiled and submitted to the Green Lake County Treasurer's office.

Section 2

What Makes Up Your Tax Bill

The property tax rate structure for Green Lake County varies by taxing district combinations. For the 2025 tax year:

ComponentDescription
State of WisconsinState-level property tax levy
Green Lake CountyCounty operations, services, and infrastructure
School DistrictLocal school district levy (varies by district - Markesan District Schools and others)
Technical CollegeMoraine Park Technical College district levy
MunicipalityCity/town/village levy (varies by location)
Special AssessmentsAdditional district-specific levies as applicable

Note: Specific mill rates are compiled from various taxing jurisdictions and vary significantly by property location within Green Lake County. Contact the Green Lake County Treasurer's office for exact rates applicable to your property's taxing district combination for the current levy year.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Green Lake 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 property taxes in Green Lake County are additional tax assessments that occur when there are changes to property ownership, value, or use during the tax year. These typically arise from new construction, property improvements that increase assessed value, or changes in property classification that weren't included in the original annual assessment.

When supplemental taxes are levied, they are calculated based on the difference between the new assessed value and the original assessed value, multiplied by the applicable tax rate for your taxing districts. The supplemental tax covers the period from when the change occurred through the end of the current tax year. Property owners receive a separate supplemental tax bill that includes the same payment options and due date requirements as regular property tax bills.

Example Calculation

Below are property tax calculations for three assessed values in Green Lake County. Note that tax credits require separate applications and are not automatically applied:

Example 1: $300,000 Assessed Value

  • Assessed Value: $300,000
  • Applicable Tax Credits: $0 (assuming no applications filed)
  • Net Taxable Value: $300,000
  • Estimated Annual Tax: $3,000-4,500 (varies by district)
  • Monthly Escrow: $250-375

Example 2: $600,000 Assessed Value

  • Assessed Value: $600,000
  • Applicable Tax Credits: $0 (assuming no applications filed)
  • Net Taxable Value: $600,000
  • Estimated Annual Tax: $6,000-9,000 (varies by district)
  • Monthly Escrow: $500-750

Example 3: $1,000,000 Assessed Value

  • Assessed Value: $1,000,000
  • Applicable Tax Credits: $0 (assuming no applications filed)
  • Net Taxable Value: $1,000,000
  • Estimated Annual Tax: $10,000-15,000 (varies by district)
  • Monthly Escrow: $833-1,250

Note: Actual rates vary significantly by taxing district location within Green Lake County. Tax credits such as Lottery and Gaming Credit require application and are not automatic.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Green Lake County require property tax escrow accounts for borrowers with less than 20% down payment. Your lender collects monthly payments equal to 1/12th of your estimated annual property tax bill plus insurance premiums. These funds are held in an escrow account and used to pay your property taxes when due.

Green Lake County property tax payments are due in two installments: the first installment by April 30th and the second installment by July 31st. However, research indicates the first installment for 2025 taxes may be due by January 31, 2026. Your mortgage servicer will make these payments directly to the appropriate Municipal Treasurer from your escrow account. You should receive an annual escrow analysis from your lender showing the account activity and any required payment adjustments. It's important to verify that your lender has the correct property tax amount, as escrow shortages can result in increased monthly payments.

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 Green Lake County property taxes due for the current tax year? A: Property taxes are due in two installments - the first installment by April 30th and the second installment by July 31st. However, for 2025 taxes, the first installment appears to be due by January 31, 2026.

Q: What tax credits are available and do I need to apply? A: The Lottery and Gaming Credit provides direct property tax relief to homeowners as a credit on their property tax bill. This and most other tax credits require application - they are NOT automatic. Contact your county assessor for available credits and application requirements.

Q: How does the Homestead Credit work? A: Wisconsin's homestead-type credits typically limit assessment increases rather than reducing market value. These credits cap the amount your assessment can increase year-over-year. You must file an application to receive these benefits - they are not applied automatically.

Q: How often are properties reassessed in Green Lake County? A: Contact the Green Lake County Assessor's office for the current assessment schedule, as this varies by municipality within the county.

Q: How do I appeal my property assessment? A: Return appeal forms to the City Clerk-Treasurer at least 48 hours prior to the scheduled start of the Board of Review. Contact your local municipality for specific appeal procedures and deadlines.

Q: What are the penalties for late property tax payments? A: Contact the Green Lake County Treasurer's office for current penalty rates and policies for late payments.

Q: Can I pay my property taxes online? A: Contact the Green Lake County Treasurer's office or your local Municipal Treasurer for available online payment options.

Q: Who do I pay my property taxes to? A: Current payments for 2025 taxes are to be made to the local Municipal Treasurer. The City Clerk/Treasurer collects taxes for the State, Green Lake County, school districts, technical college, and municipalities.

Q: Why do property tax rates vary within Green Lake County? A: Tax rates vary because different areas fall within different combinations of taxing districts including school districts (like Markesan District Schools), municipalities, and special assessment districts.

Q: When will I receive my property tax bill? A: Property tax bills are typically mailed out in mid-December after all taxing jurisdiction information is compiled and submitted to the Green Lake County Treasurer's office.

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