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Updated 2025 Tax Year

Clayton County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
1.5% to 2.5% of assessed value (varies by taxing districts)
Exemptions
4+ Available
Section 1

How Property Tax Works

Clayton County, Iowa operates under the state's property tax system to fund essential local services including schools, county government operations, emergency services, and infrastructure maintenance. Property taxes are the primary revenue source for these vital community services. The county's effective tax rate for FY 2025-2026 varies by location within the county, typically ranging from approximately 1.5% to 2.5% of assessed value, depending on the specific taxing districts where your property is located.

Property tax rates in Clayton County are not uniform countywide due to the overlay of various special taxing districts such as school districts, city governments, rural fire districts, and other local service areas. Each property's total tax rate is the combination of the county base rate plus all applicable special district levies. The county assessor determines property values based on market conditions, while local governing bodies set the tax rates needed to fund their budgets. Iowa law requires reassessment of all properties at least every two years, with many counties conducting annual reassessments.

Section 2

What Makes Up Your Tax Bill

ComponentRateDescription
County General0.21406%Basic county services and operations
School DistrictsVaries by districtK-12 education funding (largest component)
City/MunicipalVaries by cityCity services for incorporated areas
TownshipVaries by townshipRural road maintenance and services
Agricultural Extension~0.02%County extension services
Assessor~0.03%Property assessment operations
Emergency Management~0.01%Disaster preparedness and response
Special DistrictsVariesFire districts, library districts, drainage districts

Rates shown are for FY 2025-2026 levy year. The 0.21406% rate specifically applies to cemetery properties. Residential and commercial properties will have different total rates depending on their location within various school districts, cities, townships, and special service districts. Contact the Clayton County Assessor for your property's specific total rate.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Clayton 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 Clayton County occur when there are changes to property ownership, new construction, or significant improvements made during the tax year. Under Iowa Code section 331.424, counties may levy supplemental taxes for specific purposes when property values increase due to these changes. When you purchase a home, add an addition, or complete major renovations, the assessor may issue a supplemental assessment to capture the increased value for the remainder of the current tax year.

For example, if you purchase a newly constructed home in Clayton County in January 2025 that wasn't on the previous year's tax roll, you would receive a supplemental tax bill covering the period from January through the end of the fiscal year. The supplemental tax is calculated by taking the new assessed value, applying any eligible credits, multiplying by your property's total tax rate, and prorating for the portion of the year you owned the property. Supplemental bills are typically issued 30-60 days after the assessor processes the change and are due within 30 days of the issue date.

Example Calculation

Example 1: $300,000 Home

  • Assessed Value: $300,000
  • Homestead Credit Applied: -$4,850 (requires application)
  • Net Taxable Value: $295,150
  • Tax Rate (example district): 2.1%
  • Annual Property Tax: $6,198
  • Monthly Escrow: $516

Example 2: $600,000 Home

  • Assessed Value: $600,000
  • Homestead Credit Applied: -$4,850 (requires application)
  • Net Taxable Value: $595,150
  • Tax Rate (example district): 2.3%
  • Annual Property Tax: $13,688
  • Monthly Escrow: $1,141

Example 3: $1,000,000 Home

  • Assessed Value: $1,000,000
  • Homestead Credit Applied: -$4,850 (requires application)
  • Net Taxable Value: $995,150
  • Tax Rate (example district): 2.5%
  • Annual Property Tax: $24,879
  • Monthly Escrow: $2,073

Note: The Homestead Credit is NOT automatic and must be applied for with the Clayton County Assessor. Tax rates vary significantly by location within the county due to different combinations of school districts and special taxing districts.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Clayton County require borrowers to establish an escrow account to ensure property taxes are paid on time. Your lender will estimate your annual property tax bill and divide it by 12 to determine your monthly escrow payment, which is collected along with your mortgage payment. Lenders typically maintain a cushion in your escrow account to cover potential tax increases and ensure sufficient funds are available when payments are due.

Property taxes in Clayton County are paid in two installments: the first half is typically due in September, and the second half is due March 31st of the following year. Your lender will make these payments directly to the county treasurer on your behalf. Each year, your lender is required to provide an escrow analysis showing the previous year's activity and any adjustments needed for the coming year. If your property taxes increase due to rising assessments or rate changes, your monthly escrow payment will be adjusted accordingly. You can verify that your lender has made the payments by checking with the Clayton County Treasurer's office or accessing online payment records.

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 Clayton County for FY 2025-2026? A: The first half is typically due in September 2025, and the second half is due March 31, 2026. Taxes become delinquent on April 1, 2026.

Q: What tax credits are available and do I need to apply? A: The primary credit is the Homestead Credit for qualifying homeowners, worth up to $4,850 in reduced taxable value. This is NOT automatic - you must file an application with the Clayton County Assessor by July 1st of the year you first claim it. Additional credits may be available for disabled veterans, elderly residents, and other qualifying circumstances.

Q: How does the Homestead Credit work? A: The Homestead Credit doesn't reduce your home's market value assessment. Instead, it provides a credit against your tax bill and helps limit assessment increases over time. You must own and occupy the property as your primary residence and file an application to receive this state-funded credit.

Q: How often are properties reassessed in Clayton County? A: Iowa law requires reassessment at least every two years, though Clayton County may assess annually. You'll receive a notice if your assessment changes, and you have the right to appeal if you believe the assessment is incorrect.

Q: What are the penalties for late payment? A: Delinquent property taxes in Iowa accrue interest and penalties. After April 1st, delinquent taxes begin accumulating interest at a rate set by state law, and properties can eventually be subject to tax sale if taxes remain unpaid.

Q: Can I pay my property taxes online? A: Contact the Clayton County Treasurer's office to inquire about online payment options, accepted payment methods, and any associated convenience fees for electronic payments.

Q: Why did my taxes increase even though the tax rate didn't change? A: Your tax bill can increase due to rising property assessments, new special district levies, or changes in the mix of taxing districts that apply to your property. Even if rates stay the same, higher assessed values result in higher tax bills.

Q: How do special districts affect my tax rate? A: Your total tax rate is the sum of all applicable taxing districts - county, school, city (if applicable), township, and any special districts like fire protection or library districts. Properties in different areas of Clayton County will have different combinations of these districts, resulting in varying total tax rates.

Q: What if I disagree with my property assessment? A: You can appeal your assessment by contacting the Clayton County Assessor's office during the assessment appeal period, typically in April and May. You'll need to provide evidence supporting your position, such as comparable property sales or documentation of property condition issues.

Q: Do senior citizens qualify for additional tax credits? A: Iowa offers various programs for seniors including property tax deferrals and credits based on income. Contact the Clayton County Assessor to learn about available programs and application requirements, as these are not automatically applied.

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