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Updated 2025 Tax Year

Cerro Gordo County
Property Tax Guide

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

7 Official Sources
8 min read
Quick Facts
Tax Rate
Varies by taxing district; 17% decrease in FY 2024/2025 (urban: -17.06%, rural: -17.15%)
1st Due
Sep 30
2nd Due
Mar 31
Exemptions
5+ Available
Section 1

How Property Tax Works

Cerro Gordo County, Iowa operates under Iowa's property tax system to fund essential local services including schools, county government operations, emergency services, and infrastructure maintenance. Property taxes are assessed annually based on the assessed value of real estate and are the primary revenue source for local government services in the county.

The effective property tax rates in Cerro Gordo County vary by location within the county due to different combinations of taxing districts, including city, school district, community college, and other special assessment districts. For FY 2024/2025, the county experienced significant rate decreases, with urban taxpayers seeing a 17.06% decrease and rural taxpayers experiencing a 17.15% decrease in their tax rates. Your actual tax rate depends on which specific taxing districts serve your property location, so rates can vary considerably between Mason City, Clear Lake, other municipalities, and rural areas within the county.

Section 2

What Makes Up Your Tax Bill

ComponentFY 2024/2025 Rate (per $1,000)Description
Urban Taxpayer Rate$24.80Combined rate for properties in incorporated cities
Rural Taxpayer Rate$40.10Combined rate for properties in unincorporated areas

Note: These are consolidated rates for FY 2024/2025 that include county general fund, school districts, community college, and applicable special districts. Your actual rate depends on your specific location and the combination of taxing districts that serve your property. Rates are expressed per $1,000 of assessed value and represent significant decreases from the previous fiscal year (17.06% decrease for urban, 17.15% decrease for rural).

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Cerro Gordo County, property taxes are due in two installments:

First Installment
Sep 30
Delinquent after Dec 10
Second Installment
Mar 31
Delinquent after Apr 10
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 Cerro Gordo County are typically triggered by changes in property ownership, new construction, or improvements that increase a property's assessed value during the tax year. When these changes occur, the county assessor may issue a supplemental assessment to account for the increased value, and additional taxes are calculated based on the remaining months in the tax year.

For example, if you complete a $50,000 home addition in January and the county assesses this improvement, you would receive a supplemental tax bill covering the additional taxes owed for the remainder of the fiscal year. The supplemental tax would be calculated by applying the appropriate tax rate to the added assessed value, prorated for the months remaining in the tax year.

Example Calculation

Example 1: $300,000 Home (Urban)

  • Market Value: $300,000
  • Assessed Value (typically 100% in Iowa): $300,000
  • Less: Homestead Credit (if applicable): Varies by application
  • Net Taxable Value: ~$300,000
  • Annual Tax ($24.80 per $1,000): $7,440
  • Monthly Payment: $620

Example 2: $600,000 Home (Urban)

  • Market Value: $600,000
  • Assessed Value: $600,000
  • Less: Applied Tax Credits: Varies by eligibility and application
  • Net Taxable Value: ~$600,000
  • Annual Tax ($24.80 per $1,000): $14,880
  • Monthly Payment: $1,240

Example 3: $1,000,000 Property (Rural)

  • Market Value: $1,000,000
  • Assessed Value: $1,000,000
  • Less: Applied Tax Credits: Varies by eligibility and application
  • Net Taxable Value: ~$1,000,000
  • Annual Tax ($40.10 per $1,000): $40,100
  • Monthly Payment: $3,342

Note: These examples assume no tax credits are applied. Most tax credits require separate application and can significantly reduce your tax bill.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Cerro Gordo County require property tax escrow accounts, where you pay 1/12 of your estimated annual property tax with each monthly mortgage payment. Your lender collects these funds and pays your property tax bills directly to the county treasurer when they become due in September and March.

Lenders typically conduct annual escrow analyses to ensure adequate funds are collected, and may adjust your monthly payment if property taxes increase or decrease significantly. You'll receive an annual escrow statement showing all deposits and payments made on your behalf. It's important to verify that your lender pays both the September 1st and March 1st installments on time to avoid delinquency penalties, as you remain ultimately responsible for timely payment even when using escrow.

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 Cerro Gordo County? A: The first half is due September 1 and becomes delinquent October 1. The second half is due March 1 of the following year and becomes delinquent April 1.

Q: What tax credits are available and do I need to apply? A: Iowa offers various tax credits including the Homestead Credit, Military Exemption, Elderly/Disabled Credit, and others. House File 718 established a homestead tax exemption for claimants 65 years or older effective May 4, 2023. Most credits require annual application through the county assessor's office and are NOT automatic.

Q: How does the Homestead Credit work? A: The Homestead Credit typically caps the annual increase in your home's assessed value rather than reducing the market value itself. You must file an application with the county assessor to receive this credit, and it must be renewed periodically.

Q: How often are properties reassessed? A: Iowa conducts property assessments annually, with the county assessor reviewing property values each year to ensure they reflect current market conditions.

Q: What happens if I pay my taxes late? A: Property taxes become delinquent October 1 (first half) and April 1 (second half), at which point interest and penalties begin accruing monthly until paid in full.

Q: Can I pay my property taxes online? A: Contact the Cerro Gordo County Treasurer's office directly for current online payment options and accepted methods of payment.

Q: How do special district taxes work? A: Depending on your property location, you may pay additional taxes for services like fire districts, library districts, or local improvement districts. These appear as separate line items on your tax bill and explain why rates vary throughout the county.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed with the Cerro Gordo County Board of Review, typically between April 2 and May 1. Contact the county assessor's office for specific deadlines and required documentation for the current tax year.

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