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Updated 2025 Tax Year

Portage County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
$4.12 per $1,000 county base rate, total rates typically $15-25 per $1,000 (varies by municipality and school district)
Exemptions
5+ Available
Section 1

How Property Tax Works

Portage County, Wisconsin operates under a property tax system that funds essential county services, local school districts, municipalities, and various special districts. Property taxes are the primary revenue source for local government operations, including law enforcement, road maintenance, emergency services, and public education. The county follows Wisconsin's standard assessment practices, with properties assessed at fair market value without assessment caps.

The effective property tax rate in Portage County varies significantly by location due to the combination of county, municipal, school district, and special district levies. For the 2025 tax year, the base county tax rate is $4.12 per $1,000 of equalized assessed value, but total rates typically range from approximately $15-25 per $1,000 when all taxing jurisdictions are combined. Taxpayers should note that their actual rate depends on their specific location within the county and which special taxing districts (such as technical college districts, lake districts, or fire protection districts) serve their property.

Section 2

What Makes Up Your Tax Bill

ComponentRate per $1,000Description
County Levy$4.12Base county operations and services
School Districts$8.00-12.00Local school district operations (varies by district)
Municipal Levy$3.00-8.00City/town/village services (varies by municipality)
Technical College$1.50-2.50Mid-State Technical College district
Special Districts$0.50-3.00Fire protection, lake management, library districts
Total Range$15.00-25.00Combined rate varies by location

Rates shown are for the 2025 levy year (taxes payable in 2025). Actual rates vary significantly based on your specific address and the combination of taxing jurisdictions that serve your property. Contact the Portage County Clerk's office for your exact tax rate breakdown.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Portage 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 Portage County are additional property tax bills issued when there are significant changes to a property's assessed value or ownership during the tax year. Common triggers include new construction completion, major improvements, property splits or combinations, and corrections to assessment errors. The supplemental tax is calculated by applying the current year's tax rate to the difference between the original and revised assessed values.

For example, if you complete a $100,000 home addition mid-year and your total tax rate is $20 per $1,000, you would receive a supplemental tax bill for approximately $2,000 ($100,000 ÷ 1,000 × $20). The supplemental amount is prorated based on the number of months remaining in the tax year when the change takes effect. These bills are typically issued within 30-60 days of the assessment change and have separate due dates from your regular property tax payments.

Example Calculation

Property Value: $300,000

  • Assessed Value: $300,000
  • Less: Homestead Credit (if applied): -$15,000
  • Net Taxable Value: $285,000
  • Annual Tax ($20/$1,000 rate): $5,700
  • Monthly Escrow: $475

Property Value: $600,000

  • Assessed Value: $600,000
  • Less: Homestead Credit (if applied): -$15,000
  • Net Taxable Value: $585,000
  • Annual Tax ($20/$1,000 rate): $11,700
  • Monthly Escrow: $975

Property Value: $1,000,000

  • Assessed Value: $1,000,000
  • Less: Homestead Credit (if applied): -$15,000
  • Net Taxable Value: $985,000
  • Annual Tax ($20/$1,000 rate): $19,700
  • Monthly Escrow: $1,642

Examples use an estimated combined tax rate of $20/$1,000. Homestead Credit shown is illustrative - actual credit amounts and eligibility requirements vary. All tax credits require separate application and are not automatic.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Portage County require borrowers to maintain an escrow account for property tax payments, especially for loans with less than 20% down payment. Your lender collects monthly payments equal to 1/12 of your annual property tax bill, plus a cushion typically equal to 2-3 months of payments as required by federal regulations. The lender pays your property taxes directly to Portage County on your behalf when bills are due.

Lenders must provide annual escrow statements showing all deposits and payments, and any shortages or overages are typically spread over the following year's monthly payments. If your property taxes increase significantly, you may receive a notice of escrow shortage requiring either a lump sum payment or increased monthly payments. Property owners can request to remove escrow requirements once they have sufficient equity (typically 20-22%) and a good payment history, but will then be responsible for making tax payments directly to the county by the January 31st and July 31st due dates.

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 Portage County for the current fiscal year? A: Property taxes are due in two installments: January 31st and July 31st for the 2025 tax year. If the due date falls on a weekend, payments are considered timely if postmarked by the following Monday.

Q: What tax credits are available and do I need to apply? A: Common tax credits include the Homestead Credit, Veterans Disability Credit, and Senior Citizen/Disabled Person Credit. All credits require separate application and are not automatic. Contact the Portage County Clerk's office for specific eligibility requirements and application deadlines.

Q: How does the Homestead Credit work? A: The Homestead Credit limits annual assessment increases on your primary residence, typically capping growth at a certain percentage. This credit requires annual application and only applies to owner-occupied properties. It does not reduce your property's market value but can limit taxable assessed value increases.

Q: How often are properties reassessed in Portage County? A: Wisconsin law requires municipalities to assess properties annually, though some may conduct full revaluations every few years. Assessment notices are typically mailed in spring, with appeal deadlines usually in late spring or early summer.

Q: What are the penalties for late property tax payments? A: Late payments incur interest charges and penalties. Contact the Portage County Treasurer's office for current penalty rates and specific consequences of delinquent payments.

Q: Can I pay property taxes online? A: Many municipalities in Portage County offer online payment options. Check with your specific municipality or visit the Portage County website for available electronic payment methods and any associated fees.

Q: Why do I have special district taxes on my bill? A: Special districts provide specific services like fire protection, lake management, or library services. These districts have separate governing boards and tax rates that appear as additional line items on your property tax bill.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed with your local Board of Review, typically within 30 days of receiving your assessment notice. Contact your municipal clerk for specific procedures, deadlines, and required documentation for filing an appeal.

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