HonestCasa logoHonestCasa
Updated 2025 Tax Year

Decatur County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
Varies by district (typically 1.5-2.5% effective rate), differs between rural and urban areas
1st Due
Sep 30
2nd Due
Mar 31
Exemptions
5+ Available
Section 1

How Property Tax Works

Decatur County, Iowa operates under the state's property tax system, which serves as the primary funding mechanism for essential local services including schools, county government operations, emergency services, and infrastructure maintenance. Property taxes in Decatur County are levied based on assessed valuations that are updated regularly by the county assessor, with the tax rate applied to the assessed value of real property.

The effective tax rate in Decatur County varies by location within the county due to different combinations of taxing districts, including school districts, cities, townships, and special service areas. Rural properties typically face different tax rates than urban properties due to rural services levies and varying school district boundaries. Property owners should note that their specific tax rate depends on which taxing jurisdictions their property falls within, and rates can differ significantly between locations in the county.

Based on available data, Decatur County shows separate rural and urban tax structures, with total taxable valuations of approximately $274 million for rural areas and $123 million for urban areas as of the most recent assessment period. Property owners are encouraged to verify their specific tax obligations through the county treasurer's office, as individual circumstances and applicable tax credits can significantly impact final tax bills.

Section 2

What Makes Up Your Tax Bill

Due to the varying nature of special taxing districts within Decatur County, specific tax rates for FY 2024-2025 are not yet finalized. The following represents the typical structure of property tax components:

ComponentDescription
General Basic LevyCounty general operations and services
General SupplementalAdditional county operational needs
Debt ServiceBond payments and long-term debt obligations
Rural Services LevyServices specific to rural/unincorporated areas
School District LevyLocal school district operations and programs
Emergency Medical Services (EMS)Emergency response services where applicable
Special AssessmentsCity services, drainage districts, or other special districts

Note: Tax rates vary significantly by location within Decatur County based on which school district, city, township, and special districts serve each property. Rural properties are subject to rural services levies that urban properties do not pay, while urban properties may have city taxes that rural properties avoid. Property owners should contact the Decatur County Treasurer's office for their specific tax rate based on their property's location and applicable taxing jurisdictions.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Decatur 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 Iowa counties, including Decatur County, are additional tax assessments that occur when there are significant changes to property during the tax year. These typically arise from new construction, substantial improvements, or changes in property ownership that trigger reassessment outside the normal assessment cycle.

Supplemental taxes are calculated by determining the difference between the previous assessed value and the new assessed value, then applying the current tax rate to that difference. The supplemental tax covers the period from when the change occurred until the end of the current tax year. For example, if a property owner completes a $100,000 home addition in July, the supplemental tax would apply to the increased assessed value for the remaining months of that tax year.

Property owners receiving supplemental tax bills should note that these are in addition to, not instead of, their regular property tax payments. The supplemental amount will be incorporated into the following year's regular assessment and tax bill. Supplemental tax notices include information about the change that triggered the additional assessment and provide appeal rights similar to regular property tax assessments.

Example Calculation

The following examples are illustrative, as actual tax rates vary by specific location within Decatur County. These calculations assume typical Iowa assessment practices and estimated combined tax rates:

$300,000 Property Value:

  • Assessed Value: $300,000
  • Less: Homestead Credit (if applicable): -$4,850
  • Net Taxable Value: $295,150
  • Estimated Tax Rate: ~$35 per $1,000
  • Annual Tax: ~$10,330
  • Monthly Escrow: ~$861

$600,000 Property Value:

  • Assessed Value: $600,000
  • Less: Homestead Credit (if applicable): -$4,850
  • Net Taxable Value: $595,150
  • Estimated Tax Rate: ~$35 per $1,000
  • Annual Tax: ~$20,830
  • Monthly Escrow: ~$1,736

$1,000,000 Property Value:

  • Assessed Value: $1,000,000
  • Less: Homestead Credit (if applicable): -$4,850
  • Net Taxable Value: $995,150
  • Estimated Tax Rate: ~$35 per $1,000
  • Annual Tax: ~$34,830
  • Monthly Escrow: ~$2,903

Important Notes: Homestead credits require application and are not automatically applied. Tax rates vary significantly by location within the county. Contact the Decatur County Assessor for specific credits and the Treasurer for exact tax rates applicable to your property's location.

See How Taxes Affect Your Payment

Property taxes are just part of your total monthly cost. Get the full picture.

Calculate Now
Section 5

Escrow & Property Taxes

Most mortgage lenders in Decatur County require property tax escrow accounts for borrowers with less than 20% down payment, though some lenders may require escrow regardless of down payment amount. The lender collects monthly payments equal to 1/12 of the annual property tax bill along with the mortgage payment, holding these funds in a separate escrow account to pay property taxes when due.

Property taxes in Decatur County are typically due in two installments: the first half by March 31 and the second half by September 30. Lenders usually pay these bills directly to the Decatur County Treasurer before the due dates. Property owners should receive escrow account statements annually showing collections, payments, and account balances, as required by federal law.

Property owners with escrow accounts should monitor their tax bills for accuracy and notify their lender of any discrepancies. When property taxes increase due to assessment changes or rate increases, lenders may require increased monthly escrow payments and may offer the option to pay the shortage over 12 months or immediately. Property owners can request escrow account removal once they reach sufficient equity levels and demonstrate a history of timely payments, though they become responsible for making direct tax payments to avoid penalties.

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 Decatur County? A: Property taxes are due in two installments annually. The first half payment is due by March 31, and the second half is due by September 30. Taxes become delinquent if not paid by April 1 (first half) and October 1 (second half).

Q: What homestead tax credits are available and how do I apply? A: Iowa offers a homestead tax credit for eligible homeowners, with enhanced credits for seniors 65 and older as of 2023. These credits must be applied for through the Decatur County Assessor's office and are not automatic. The homestead credit also includes assessment limitation features that cap annual assessment increases. Application deadlines typically fall in early July.

Q: How does the homestead credit work? A: The homestead credit provides both a direct tax credit and limits assessment increases on qualifying properties. It does not reduce market value but rather limits how much the taxable assessment can increase annually, providing protection against rapidly rising property values. You must apply with the county assessor to receive these benefits.

Q: What military service tax exemptions are available? A: Iowa provides property tax exemptions for qualifying military veterans, including enhanced benefits for disabled veterans and their surviving spouses. These exemptions reduce the assessed value subject to taxation and require application through the Decatur County Assessor's office with appropriate military documentation.

Q: How often are properties reassessed in Decatur County? A: Iowa law requires counties to maintain assessments at market value, with reassessment occurring as market conditions change. Properties may be physically inspected on rotating cycles, but assessments are reviewed annually. Property owners receive assessment notices and have appeal rights if they disagree with valuations.

Q: What are the penalties for late property tax payments? A: Late payments incur interest and penalty charges. Properties with delinquent taxes may be subject to tax sale procedures, with notices typically published in June for first-half taxes that remained unpaid after April 1.

Q: Can I pay property taxes online? A: Contact the Decatur County Treasurer's office to verify available online payment options, as counties vary in their electronic payment systems. Many Iowa counties offer online payment through their websites or third-party services.

Q: Why do tax rates vary within Decatur County? A: Tax rates depend on which combination of taxing jurisdictions serve each property, including school districts, cities, townships, drainage districts, and other special service areas. Rural properties pay rural services levies while urban properties may have city taxes, creating different total tax rates across the county.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed with the Decatur County Board of Review by May 31 following the assessment notice. Appeals require evidence that the assessed value exceeds market value, such as recent sales data, appraisals, or property condition information.

Q: What family farm tax benefits are available? A: Iowa provides various agricultural tax benefits including family farm tax credits for qualifying agricultural operations. These require application through the county assessor and have specific eligibility requirements related to farm ownership, operation, and income levels.

See the Full Picture of Your Home Costs

Property taxes are just one piece of homeownership. HonestCasa helps you understand your total monthly cost and explore safe ways to access your home equity.

Total Monthly Cost

Mortgage + taxes + insurance + HOA

Equity Growth

Track how your equity grows over time

Safe Equity Access

Options for projects or debt payoff

Free • No credit check • 2-minute estimate