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Updated 2025 Tax Year

Polk County
Property Tax Guide

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

7 Official Sources
8 min read
Quick Facts
Tax Rate
1.2% to 2.5% depending on school district, city, and special districts
1st Due
Sep 30
2nd Due
Mar 31
Exemptions
5+ Available
Section 1

How Property Tax Works

Polk County operates under Iowa's property tax system, which funds essential local services including schools, county operations, cities, and special districts. Property taxes are the primary revenue source for these local government functions, with tax rates determined annually through budget processes by each taxing authority. The county serves as the collection agent for all property taxes within its boundaries.

Property tax rates in Polk County vary significantly by location due to the different combinations of taxing districts that serve each property. While Iowa's statewide average effective tax rate is approximately 1%, actual rates in Polk County can range from around 1.2% to over 2.5% depending on your specific school district, city, and any special taxing districts like community colleges or urban renewal areas. The Polk County Treasurer's Office reminds residents that property tax payments are due September 30th and March 31st each year, with the current tax year being 2024.

Section 2

What Makes Up Your Tax Bill

ComponentApproximate Rate RangeDescription
County General$3.50-$4.50 per $1,000Basic county services, health services, conservation
School Districts$12.00-$18.00 per $1,000Varies by district; Des Moines, Ankeny, West Des Moines, etc.
City/Municipal$5.00-$12.00 per $1,000City services; rates vary significantly by municipality
Community College$0.75-$1.25 per $1,000Des Moines Area Community College (DMACC)
Ag Extension$0.15-$0.25 per $1,000Iowa State University Extension services
Assessor$0.35-$0.45 per $1,000Property assessment administration
Total Estimated Range$21.75-$36.45 per $1,000Varies by specific taxing district combination

Note: These are estimated ranges for FY 2024-2025. Actual rates are determined annually after budget hearings and vary by the specific combination of taxing districts serving your property. Special districts like TIF areas, drainage districts, or bond issues may add additional levies.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Polk 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 Polk County are additional tax bills issued when property undergoes significant changes during the tax year, such as new construction completion, substantial improvements, or ownership transfers that trigger reassessment. These taxes cover the difference between the original assessment and the new assessed value, prorated for the portion of the tax year the change was in effect.

For example, if you complete a $100,000 home addition in October that increases your assessed value by $100,000, you would receive a supplemental tax bill for approximately 50% of the additional annual tax (covering October through March). If your total tax rate is $25 per $1,000 of assessed value, the additional annual tax would be $2,500, and your supplemental bill would be approximately $1,250 for the remaining six months of the tax year.

Example Calculation

Example 1: $300,000 Home in Suburban Area

  • Market Value: $300,000
  • Assessed Value: $300,000 (100% of market value)
  • Homestead Credit: -$4,850 (requires application)
  • Net Taxable Value: $295,150
  • Tax Rate: $28.50 per $1,000
  • Annual Tax: $8,412
  • Monthly (if escrowed): $701

Example 2: $600,000 Home with Senior Credit

  • Market Value: $600,000
  • Assessed Value: $600,000
  • Homestead Credit: -$4,850 (requires application)
  • Military Credit: -$1,852 (if qualified, requires application)
  • Net Taxable Value: $593,298
  • Tax Rate: $32.25 per $1,000
  • Annual Tax: $19,134
  • Monthly (if escrowed): $1,595

Example 3: $1,000,000 Home in Des Moines

  • Market Value: $1,000,000
  • Assessed Value: $1,000,000
  • Homestead Credit: -$4,850 (requires application)
  • Net Taxable Value: $995,150
  • Tax Rate: $35.75 per $1,000
  • Annual Tax: $35,577
  • Monthly (if escrowed): $2,965

Note: All tax credits require annual application and approval. Rates shown are estimates and vary by specific taxing district location.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Polk County require property tax escrow accounts, where monthly payments are collected along with your mortgage payment to cover annual property taxes. Lenders typically estimate annual taxes and divide by 12, often maintaining a cushion of 1-2 months of payments. Your lender pays taxes directly to the Polk County Treasurer on your behalf when bills become due.

It's important to verify that your lender pays both installments on time - the first installment due September 30th and the second due March 31st. Late payments incur 1.5% monthly interest charges beginning October 1st and April 1st respectively. You can verify payments and check current tax information online at https://www.polkcountyiowa.gov/treasurer/. If you pay your own taxes (no escrow), you can pay online, by mail, or in person at the Treasurer's Office.

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 Polk County? A: For tax year 2024, the first installment is due September 30, 2024, and the second installment is due March 31, 2025. Interest of 1.5% per month begins accruing on October 1st and April 1st respectively for late payments.

Q: What tax credits are available and do they require application? A: Most tax credits require annual application, including the Homestead Credit (up to $4,850), Military Service Credit, Elderly/Disabled Credit, and Family Farm Credit. Applications must typically be filed with the Polk County Assessor by July 1st. These are NOT automatic.

Q: How does the Homestead Credit work? A: The Homestead Credit provides property tax relief for owner-occupied homes but requires annual application. It includes both a tax credit portion and an assessment limitation that caps annual assessment increases. You must file annually with the Assessor's Office - it is not automatic.

Q: When are properties reassessed? A: Iowa law requires properties to be assessed at 100% of market value annually. The Polk County Assessor's Office conducts ongoing market analysis and may physically inspect properties on a rotating schedule or when improvements are made.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed with the Polk County Board of Review by May 31st following the assessment notice. Contact the Assessor's Office at https://www.polkcountyiowa.gov/auditor/property-assessment/ for appeal procedures and forms.

Q: What happens if I pay my taxes late? A: Interest of 1.5% per month is charged beginning October 1st for first installments and April 1st for second installments. Delinquent taxes can eventually result in tax sale proceedings.

Q: Can I pay my property taxes online? A: Yes, Polk County offers online payment options through their secure payment system. Visit https://www.polkcountyiowa.gov/treasurer/ for online payment access and instructions.

Q: Why do tax rates vary within Polk County? A: Tax rates depend on your specific combination of taxing districts, including your school district, city, and any special districts like community colleges, drainage districts, or TIF areas. Properties in different locations have different combinations of these taxing authorities.

Q: What triggers supplemental tax bills? A: Supplemental taxes are issued for new construction, major improvements, or changes in ownership that result in assessment changes during the tax year. The supplemental amount covers the additional tax for the remaining portion of the tax year.

Q: Do senior citizens get property tax relief? A: Iowa offers several programs including the Elderly/Disabled Credit and Property Tax Deferral programs for qualifying seniors. These require separate applications and have specific income and age requirements. Contact the Assessor's Office for details and applications.

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