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Updated 2025 Tax Year

Adams County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
Approximately 7.53% proposed for 2024-2025, varies by taxing district combination
1st Due
Sep 30
2nd Due
Mar 31
Exemptions
5+ Available
Section 1

How Property Tax Works

Adams County, Iowa operates on a property tax system that funds essential local services including county government operations, schools, emergency services, and infrastructure maintenance. Property taxes are the primary revenue source for these services, with tax bills calculated by applying various levy rates to the assessed value of real property.

The effective property tax rate in Adams County varies significantly based on your specific location within the county due to different combinations of taxing districts. For fiscal year 2024-2025, the proposed combined property tax rate is approximately 7.53%, though this rate applies differently across various school districts, cities, and special service areas within the county. Your actual tax rate depends on which city, school district, and special taxing districts (such as emergency services or library districts) serve your property location.

Property assessments in Iowa are conducted by the county assessor and are based on market value as of January 1st of the assessment year. Unlike some states, Iowa does not impose a statewide assessment cap, allowing assessments to reflect current market conditions.

Section 2

What Makes Up Your Tax Bill

ComponentEstimated RateDescription
County General~2.50%Basic county services, roads, administration
School Districts~3.50%K-12 education funding (varies by district)
City/Municipal~1.00%City services where applicable
Special Districts~0.53%Emergency services, library, rural services
Total Estimated~7.53%Combined rate for FY 2024-2025

Note: These rates are estimates for fiscal year July 1, 2024 to June 30, 2025, and are subject to final approval by the respective governing bodies. Actual rates vary significantly by location within Adams County depending on your specific school district, city limits, and which special taxing districts serve your area. Contact the Adams County Assessor for your exact tax rate combination.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Adams 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 Adams County are additional property tax bills issued when there are changes to property ownership, new construction completion, or significant improvements that weren't included in the regular assessment cycle. These taxes ensure that property tax obligations are properly allocated between buyers and sellers during ownership transfers, and that new construction contributes its fair share of property taxes immediately upon completion.

When supplemental taxes are triggered, they're calculated by applying the current tax rate to the change in assessed value, prorated for the portion of the tax year remaining. For example, if you complete a $100,000 home addition in January and the addition is assessed at $80,000, you would owe supplemental taxes on that $80,000 of added value for the remaining months of the current tax year. The supplemental bill would be approximately $6,024 ($80,000 × 7.53%) prorated for the remaining 11 months, or about $5,522.

Example Calculation

Example 1: $300,000 Home

  • Assessed Value: $300,000
  • Less Homestead Credit: -$6,500 (if qualified and applied)
  • Net Taxable Value: $293,500
  • Annual Tax: $293,500 × 7.53% = $2,210
  • Monthly Escrow: ~$184

Example 2: $600,000 Home

  • Assessed Value: $600,000
  • Less Homestead Credit: -$6,500 (if qualified and applied)
  • Net Taxable Value: $593,500
  • Annual Tax: $593,500 × 7.53% = $4,469
  • Monthly Escrow: ~$372

Example 3: $1,000,000 Home

  • Assessed Value: $1,000,000
  • Less Homestead Credit: -$6,500 (if qualified and applied)
  • Net Taxable Value: $993,500
  • Annual Tax: $993,500 × 7.53% = $7,481
  • Monthly Escrow: ~$623

Note: Homestead credit reduces taxable value by $6,500 for qualified owner-occupied properties but requires annual application. Additional credits may be available for seniors, veterans, or disabled persons - all require separate applications with specific deadlines.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Adams County require property tax escrow accounts for loans with less than 20% down payment. Your lender collects monthly property tax payments along with your mortgage payment and pays your tax bills directly to the county treasurer when due. The monthly escrow amount is calculated by dividing your annual property tax bill by 12, often with an additional cushion to account for potential increases.

Property taxes in Adams County are paid in two installments: the first half is due September 1st and becomes delinquent October 1st, while the second half is due March 1st of the following year and becomes delinquent April 1st. If you have an escrow account, your lender typically pays the September installment from funds collected through August, and the March installment from funds collected through February.

You should receive an annual escrow analysis from your lender showing the projected tax payments and any adjustments to your monthly escrow amount. It's important to verify that your lender is paying the correct amount by reviewing your actual property tax statements from Adams County and comparing them to your escrow analysis.

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 Adams County for the current fiscal year? A: For fiscal year 2024-2025, the first half is due September 1, 2024 (delinquent October 1), and the second half is due March 1, 2025 (delinquent April 1, 2025).

Q: What homestead tax credit is available and do I need to apply? A: The homestead credit reduces your taxable value by $6,500 for properties you occupy as your primary residence at least 6 months per year and reside in on July 1st. You must apply annually with the county assessor - it is not automatic.

Q: Are there other tax credits available in Adams County? A: Yes, credits may be available for seniors, veterans, disabled persons, and others. All credits require separate applications with specific deadlines. Contact the Adams County Assessor's office for eligibility requirements and application deadlines.

Q: How often are properties reassessed in Adams County? A: Iowa law requires properties to be assessed annually, with assessments based on market value as of January 1st. The county assessor may conduct physical inspections on a rotating schedule or when ownership changes occur.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed with the Adams County Board of Review by May 1st following the assessment. You can obtain appeal forms from the county assessor's office or online through the county website.

Q: What are the penalties for late property tax payments? A: Late payments incur interest charges and penalties. After becoming delinquent, interest accrues monthly, and properties may eventually be subject to tax sale if taxes remain unpaid for extended periods.

Q: Can I pay my property taxes online? A: Yes, Adams County offers online payment options including eCheck payments for $0.25 or credit/debit card payments for 2.25% of the tax amount.

Q: Why does my tax rate differ from my neighbor's? A: Tax rates vary within Adams County based on your specific location and which combination of school district, city, and special taxing districts (emergency services, library, etc.) serve your property. Even properties on the same street may have different rates if they're in different districts.

Q: Does the homestead credit reduce my home's value? A: No, the homestead credit reduces your taxable value by $6,500, not your assessed market value. This means you pay taxes on $6,500 less than your home's assessed value, but the credit doesn't affect your home's appraised worth for refinancing or selling purposes.

Q: What happens if I buy or sell property mid-year? A: Property taxes are typically prorated between buyer and seller at closing based on the closing date. The county may issue supplemental tax bills to ensure proper allocation of the tax burden between the parties.

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