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Updated 2025 Tax Year

Dallas County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
Approximately $10.80 per $1,000 of assessed value (varies by taxing district location)
1st Due
Sep 30
2nd Due
Mar 31
Exemptions
5+ Available
Section 1

How Property Tax Works

Dallas County, Iowa operates under a property tax system that funds essential local services including schools, county operations, municipalities, and various special districts. Property taxes are the primary revenue source for these local governments, supporting everything from public safety and infrastructure to education and community services. The county assesses property at market value, with taxes calculated based on the combined levy rates of all applicable taxing jurisdictions.

Property tax rates in Dallas County vary significantly by location within the county due to overlapping special taxing districts including school districts, cities, rural fire districts, and other local service areas. For the 2025-26 fiscal year, the overall tax rate is approximately $10.80 per thousand dollars of assessed valuation, though individual property owners may pay more or less depending on their specific location and applicable districts. Property owners should verify their exact rate by checking which taxing jurisdictions apply to their specific property address.

Section 2

What Makes Up Your Tax Bill

ComponentRate (per $1,000)Description
County GeneralVariesBasic county services, roads, public safety
School DistrictVariesLocal school district operations and facilities
City/MunicipalityVariesMunicipal services (if within city limits)
Agricultural ExtensionVariesCounty extension services
Mental Health ServicesVariesRegional mental health and disability services
Emergency ServicesVariesFire/EMS districts (varies by location)
Total Combined Rate~$10.80FY 2025-2026 approximate average

Note: The actual tax rate for any specific property depends on which taxing districts serve that location. Rural properties, city properties, and properties in different school districts will have different total rates. The $10.80 rate represents a $0.05 decrease from the previous fiscal year but applies only to certain districts within the county.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Dallas 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 property taxes in Dallas County are additional tax bills issued when property ownership changes or new construction is completed during the tax year. These taxes cover the difference between what the previous assessment generated and what the new assessment should generate for the remaining portion of the tax year.

Supplemental taxes are most commonly triggered by: property sales that result in reassessment to current market value, completion of new construction or major improvements, and changes in property use or zoning. The supplemental tax is calculated by taking the difference between the old and new assessed values, multiplying by the applicable tax rate, and prorating for the remaining months in the fiscal year.

For example, if a property sells in January for $500,000 but was previously assessed at $350,000, a supplemental tax bill would be issued for the increased assessment ($150,000 difference) prorated for the remaining months of the fiscal year. This ensures the county collects appropriate taxes based on current property values rather than outdated assessments.

Example Calculation

Example 1: $300,000 Home

  • Market/Assessed Value: $300,000
  • Less: Homestead Credit (if applied): varies
  • Net Taxable Value: ~$300,000
  • Annual Tax ($10.80 rate): $3,240
  • Monthly Payment: $270

Example 2: $600,000 Home

  • Market/Assessed Value: $600,000
  • Less: Homestead Credit (if applied): varies
  • Net Taxable Value: ~$600,000
  • Annual Tax ($10.80 rate): $6,480
  • Monthly Payment: $540

Example 3: $1,000,000 Home

  • Market/Assessed Value: $1,000,000
  • Less: Available Tax Credits (if applied): varies
  • Net Taxable Value: ~$1,000,000
  • Annual Tax ($10.80 rate): $10,800
  • Monthly Payment: $900

Note: These examples use the approximate average rate of $10.80 per $1,000. Actual rates vary by location within Dallas County. Tax credits require separate applications and are not automatically applied. Homestead credits may limit annual assessment increases but do not reduce market value.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Dallas 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 tax payments along with principal and interest, depositing these funds into an escrow account to pay property taxes when due.

Property taxes in Dallas County are paid in two installments: the first half is due by September 30th, and the second half is due by March 1st of the following year. Lenders typically pay each installment on or before the due date to avoid late penalties. Property owners with escrow accounts should receive annual escrow statements showing tax payments made on their behalf and any account adjustments needed to maintain adequate reserves.

Property owners should verify that their lender is paying taxes correctly and on time, as the property owner remains ultimately responsible for tax payments even when escrowed. The Dallas County Treasurer's office provides online tools to check payment status and verify that tax obligations are current.

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

When are property taxes due in Dallas County for FY 2025-2026? Property taxes are due in two installments: first half by September 30, 2025, and second half by March 1, 2026. Taxes become delinquent after March 31, 2026, and accrue late interest charges.

What tax credits are available and do they require applications? Dallas County offers several tax credits including the Homestead Credit for owner-occupied residences and the Senior Homestead Exemption for property owners 65 and older. All tax credits require separate applications and are NOT automatically applied. The 65+ Homestead Exemption can be filed electronically and must be renewed periodically.

How does the Homestead Credit work? The Homestead Credit limits annual assessment increases on owner-occupied homes rather than reducing the actual market value. Property owners must apply for this credit - it is not automatic. The credit helps provide property tax stability by capping how much assessments can increase each year, but it does not reduce your home's assessed market value.

How often are properties reassessed in Dallas County? Iowa law requires properties to be assessed annually, but Dallas County may conduct physical inspections on rotating schedules. Market value assessments are updated regularly based on sales data and market conditions, even without physical inspections.

How do I appeal my property assessment? Property owners who disagree with their assessment can file an appeal with the Dallas County Board of Review. Appeals must typically be filed by May 31st following the assessment notice. The process involves presenting evidence of your property's actual market value.

What happens if I pay my property taxes late? Taxes not paid by March 31st become delinquent and accrue interest charges. The interest rate is set by state law and compounds over time. Severely delinquent taxes can eventually result in tax sale proceedings.

Can I pay my property taxes online? Yes, Dallas County provides online payment options through the County Treasurer's website. Various payment methods are typically accepted including electronic checks and credit cards, though convenience fees may apply for credit card payments.

Why do property tax rates vary within Dallas County? Tax rates vary because properties are served by different combinations of taxing jurisdictions. A rural property may be served by the county, school district, and fire district, while a city property adds municipal taxes. Each jurisdiction sets its own levy rate based on budget needs.

What special districts might affect my property taxes? Common special districts in Dallas County include school districts, fire/EMS districts, library districts, and drainage districts. The specific districts serving your property depend on your location and can significantly impact your total tax rate.

Are there tax credits available for agricultural or business property? Yes, Iowa offers various tax credits for agricultural land, business property, and other specialized uses. These require separate applications and have specific eligibility requirements. Contact the Dallas County Assessor's office for details about credits applicable to your property type.

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