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Updated 2025 Tax Year

Green County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
Approximately 1% base rate of assessed value, varies significantly by municipality and special taxing districts
Exemptions
5+ Available
Section 1

How Property Tax Works

Green County, Wisconsin operates under a property tax system that serves as the primary funding mechanism for local government services, including schools, county operations, municipal services, and special districts. Property taxes in Green County fund essential services such as education, public safety, road maintenance, parks and recreation, and various county administrative functions. The county follows Wisconsin's property tax structure with a base rate of approximately 1% of assessed value, though actual rates vary significantly by location within the county.

Property tax rates in Green County vary by municipality and special taxing district, meaning two properties of equal value may have different tax bills depending on their specific location and the services provided in that area. These variations occur because different municipalities, school districts, and special purpose districts (such as fire districts or library districts) may have different funding needs and tax levies. Property owners should expect their actual tax rate to differ from county averages based on their specific location within Green County and the combination of taxing jurisdictions that serve their property.

Section 2

What Makes Up Your Tax Bill

ComponentEst. Rate RangeDescription
County Levy0.25% - 0.35%General county operations, services
School Districts0.60% - 0.80%K-12 education funding
Municipal Levy0.15% - 0.30%City/town/village services
Technical College0.05% - 0.10%Southwest Wisconsin Technical College
Special Districts0.00% - 0.20%Fire, library, drainage districts (varies)
Total Est. Range1.05% - 1.75%Combined effective rate

Note: These rates apply to the FY 2025 levy year and are estimates based on available data. Actual rates vary significantly by specific location within Green County due to different combinations of special taxing districts. Contact the Green County Assessor's Office for precise rates applicable to your specific property location.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Green 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 County are additional tax assessments that occur when there are changes to a property's assessed value during the tax year. Common triggers include new construction completion, major improvements or renovations, ownership changes that prompt reassessment, or corrections to previous assessments. These supplemental taxes ensure that property improvements are taxed for the portion of the tax year they existed.

When a supplemental tax is triggered, Green County calculates the additional tax owed based on the increase in assessed value multiplied by the applicable tax rate for that property's location. For example, if a homeowner completes a $50,000 home addition in June, and their total tax rate is 1.2%, they would owe a supplemental tax of approximately $300 ($50,000 × 1.2% × 6/12 months remaining in the tax year). Supplemental tax bills are typically issued within 30-60 days of the assessment change and have separate due dates from regular property tax payments.

Example Calculation

Example 1: $300,000 Home

  • Assessed Value: $300,000
  • Less: Homestead Credit (if eligible): -$1,168
  • Net Taxable Value: $298,832
  • Tax Rate (assumed 1.3%): × 0.013
  • Annual Tax: $3,885
  • Monthly Escrow: $324

Example 2: $600,000 Home

  • Assessed Value: $600,000
  • Less: Homestead Credit (if eligible): -$1,168
  • Net Taxable Value: $598,832
  • Tax Rate (assumed 1.4%): × 0.014
  • Annual Tax: $8,384
  • Monthly Escrow: $699

Example 3: $1,000,000 Home

  • Assessed Value: $1,000,000
  • Less: Homestead Credit (if eligible): -$1,168
  • Net Taxable Value: $998,832
  • Tax Rate (assumed 1.5%): × 0.015
  • Annual Tax: $14,982
  • Monthly Escrow: $1,249

Note: Homestead Credit amounts shown are maximum estimates and require annual application. Actual credits may be lower based on income thresholds. Tax rates vary by specific location within Green County.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Green County require borrowers to maintain an escrow account for property tax payments, especially when the loan-to-value ratio exceeds 80%. The lender collects monthly escrow payments along with principal and interest, then pays property taxes directly to Green County on behalf of the homeowner. Monthly escrow amounts are calculated by dividing the annual property tax bill by 12, often with an additional cushion to account for potential tax increases.

Property tax payments in Green County are due January 31st for full payment, or can be split into two installments with the first due January 31st and the second due July 31st. Lenders typically pay the full amount by the January 31st deadline to avoid any late fees. Homeowners should verify that their lender has made timely payments and can request copies of payment receipts. If property taxes increase significantly, lenders may require escrow account adjustments, potentially resulting in higher monthly payments or a lump-sum payment to cover shortfalls.

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 Green County? A: Property taxes are due January 31st for full payment. Alternatively, you can pay in two installments: first installment by January 31st and second installment by July 31st. Late payments incur penalties of 1.5% per month.

Q: What tax credits are available and how do I apply? A: The primary credit is the Wisconsin Homestead Credit, which provides up to $1,168 in tax relief for eligible homeowners based on income thresholds. This credit requires annual application through your Wisconsin tax return and is NOT automatic. Contact the Green County Assessor's office for information on other potential credits.

Q: How does the Homestead Credit work? A: The Homestead Credit is a tax credit (not an exemption) that reduces your property tax bill, not your assessed value. It helps limit the impact of property tax increases for eligible homeowners with household incomes below certain thresholds. You must apply annually through your state tax return - it is not automatically applied.

Q: How often are properties assessed in Green County? A: Wisconsin requires property assessments to reflect market value, with reassessments occurring as needed to maintain accurate valuations. Contact the Green County Assessor's office for your specific assessment schedule and current assessed value.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed with the local Board of Review, typically meeting in May. You have specific deadlines to file appeals, usually within 30 days of receiving your assessment notice. Contact the Green County Assessor's office for specific procedures and deadlines.

Q: Can I pay property taxes online? A: Contact the Green County Treasurer's office for current online payment options and accepted payment methods. Many Wisconsin counties offer online payment portals for convenience.

Q: Why do tax rates vary within Green County? A: Tax rates vary because different areas are served by different combinations of school districts, municipalities, and special districts (fire, library, etc.). Each taxing jurisdiction sets its own levy, creating different total tax rates across the county.

Q: What happens if I pay my taxes late? A: Late payments incur penalties of 1.5% per month on the unpaid balance. Personal property taxes and real estate taxes both follow this penalty structure. Prolonged non-payment can result in tax liens and potential foreclosure proceedings.

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