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Updated 2025 Tax Year

Black Hawk County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
Average 18.85% of assessed value (varies significantly by taxing district combination)
1st Due
Sep 30
2nd Due
Mar 31
Exemptions
5+ Available
Section 1

How Property Tax Works

Black Hawk County property taxes fund essential local services including schools, public safety, infrastructure, and county operations. The property tax system is based on assessed values determined by the county assessor, with tax rates varying significantly by location within the county due to different combinations of taxing districts including school districts, municipalities, and special service areas.

For the 2025-2026 tax year, effective tax rates in Black Hawk County average around 18.85% of assessed value, though this varies considerably depending on your specific location within the county. Properties in different cities, school districts, and special taxing districts will have different total rates. The county uses a rollback system that limits the taxable value for residential and agricultural properties, providing some protection against rapid assessment increases.

Section 2

What Makes Up Your Tax Bill

ComponentApproximate RateDescription
County General3.5-4.5%Basic county services, roads, administration
School District12-15%K-12 education funding (varies by district)
City/Municipal1-3%City services, police, fire, utilities
Community College0.5-1%Hawkeye Community College district
Special Districts0.5-2%Libraries, emergency services, drainage districts
Total Range17-25%Combined rate varies by location

Rates shown are for FY 2025-2026 and represent typical ranges. Your actual rate depends on the specific combination of taxing districts where your property is located. Contact the Black Hawk County Assessor for your exact rate.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Black Hawk 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 are additional property tax bills issued when there are changes in property ownership, new construction, or significant improvements completed after the January 1 assessment date. These taxes cover the difference between what was originally assessed and what should have been assessed for the current tax year.

Common triggers include purchasing a newly constructed home, completing major renovations, or when the assessor discovers previously unrecorded improvements. The supplemental tax is calculated by applying the current year's tax rate to the difference in assessed value, prorated for the remaining months in the fiscal year. For example, if you purchase a new $400,000 home in December that wasn't on the original tax roll, you might receive a supplemental bill for several months of taxes on that assessed value.

Example Calculation

Example 1: $300,000 Home

  • Market Value: $300,000
  • Assessed Value (residential rollback applied): $300,000
  • Homestead Credit Applied: -$3,250 (requires application)
  • Net Taxable Value: $296,750
  • Tax Rate: 18.85%
  • Annual Tax: $5,593
  • Monthly Escrow: $466

Example 2: $600,000 Home

  • Market Value: $600,000
  • Assessed Value: $600,000
  • Homestead Credit Applied: -$3,250 (requires application)
  • Net Taxable Value: $596,750
  • Tax Rate: 18.85%
  • Annual Tax: $11,248
  • Monthly Escrow: $937

Example 3: $1,000,000 Home

  • Market Value: $1,000,000
  • Assessed Value: $1,000,000
  • Homestead Credit Applied: -$3,250 (requires application)
  • Net Taxable Value: $996,750
  • Tax Rate: 18.85%
  • Annual Tax: $18,789
  • Monthly Escrow: $1,566

Note: Credits require application and are not automatic. Actual rates vary by taxing district location.

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Section 5

Escrow & Property Taxes

Most mortgage lenders require property tax escrow accounts for Black Hawk County properties. Your lender collects 1/12 of your estimated annual tax bill with each monthly mortgage payment, then pays the county directly when taxes are due. Lenders typically maintain a cushion of 2-6 months of tax payments in your escrow account as required by federal regulations.

Property taxes are paid semi-annually, with the first half due September 1st and the second half due March 1st of the following year. Your lender will make these payments on your behalf if you have an escrow account. You'll receive an annual escrow analysis showing how your tax payments affect your monthly mortgage payment, and any adjustments needed due to tax rate changes or assessment updates.

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 Black Hawk County for FY 2025-2026? A: First half taxes are due September 1, 2025, and become delinquent after September 30. Second half taxes are due March 1, 2026, and become delinquent after March 31.

Q: What tax credits are available and do I need to apply? A: The main credit is the Homestead Tax Credit ($3,250 for assessment years 2024 and after), plus potential Military Service Tax Credits. All credits require application - they are NOT automatic. Applications must be filed annually.

Q: How does the Homestead Credit work? A: The Homestead Credit provides up to $3,250 in taxable value reduction and caps assessment increases. You must file an application with the county assessor by July 1st following the assessment year to receive this credit.

Q: When are properties reassessed? A: Black Hawk County conducts ongoing assessments with formal revaluation cycles. Assessment notices are typically mailed in April, with appeal deadlines in early May.

Q: What are the penalties for late payment? A: Delinquent taxes incur interest charges and penalties. First half becomes delinquent October 1st, second half becomes delinquent April 1st, with additional fees and interest applied monthly.

Q: Can I pay property taxes online? A: Yes, Black Hawk County offers online payment options through their treasurer's website. Credit card and electronic check payments are typically accepted with associated processing fees.

Q: Why do tax rates vary within Black Hawk County? A: Different combinations of school districts, cities, and special taxing districts create varying total tax rates. Properties in Waterloo will have different rates than those in Cedar Falls or rural areas.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed with the Board of Review by the deadline shown on your assessment notice (typically early May). You'll need evidence supporting your claim that the assessed value is incorrect.

Q: What happens if I don't apply for available tax credits? A: You'll pay the full tax amount without any credits. Credits like the Homestead Credit can save hundreds of dollars annually but require timely application - they cannot be applied retroactively.

Q: Are there additional exemptions for seniors or disabled veterans? A: Iowa offers various exemptions for qualifying seniors, disabled veterans, and other special circumstances. Contact the Black Hawk County Assessor's office to determine eligibility and application requirements, as most require annual filing.

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