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Updated 2025 Tax Year

Warren County
Property Tax Guide

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

10 Official Sources
8 min read
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Quick Facts
Tax Rate
0.8% to 1.2% of assessed value, varies by taxing districts within county
1st Due
Oct 1
2nd Due
Dec 31
Exemptions
4+ Available
Section 1

How Property Tax Works

Warren County, Missouri operates under a property tax system that funds essential local services including schools, fire protection, libraries, and county operations. Property taxes in Warren County are assessed annually based on market value as of January 1st, with taxes levied on October 1st and bills typically mailed to property owners in November. The effective tax rate in Warren County generally ranges from approximately 0.8% to 1.2% of assessed value, though this varies significantly based on your specific location within the county.

Your actual property tax rate depends on which special taxing districts serve your property, including school districts, fire protection districts, ambulance districts, and other local services. Properties in different areas of Warren County may have substantially different tax rates even with similar assessed values due to these varying district combinations. The Missouri State Auditor publishes official property tax rates annually, with the 2025 rates to be finalized in the upcoming Property Tax Rate Report.

Section 2

What Makes Up Your Tax Bill

ComponentApproximate RateDescription
County General0.2500Basic county services and operations
School District4.0000-5.5000Varies by district (operating and debt service)
Fire Protection0.3000-0.8000Local fire district services
Ambulance District0.1500-0.4000Emergency medical services
Library District0.1000-0.3000Public library services
Road District0.2000-0.5000Local road maintenance
Total Estimated Range5.0000-7.9000Combined rate varies by location

Rates shown are estimates per $100 of assessed value for levy year 2025. Your actual rate depends on which specific taxing districts serve your property location. Contact the Warren County Assessor at (636) 456-3331 for your exact district combination and current rates.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Warren County, property taxes are due in two installments:

First Installment
Oct 1
Delinquent after Dec 10
Second Installment
Dec 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 Warren County are triggered by changes in property ownership, new construction, or significant improvements that occur after the January 1st assessment date. When you purchase property or complete construction during the tax year, the assessor calculates a prorated tax bill based on the change in assessed value and the remaining months in the tax year.

For example, if you purchase a home in June that results in a $50,000 increase in assessed value, and your combined tax rate is 6.0000 per $100, you would owe a supplemental tax of approximately $1,500 ($50,000 ÷ 100 × 6.0000 = $3,000 annual increase × 6/12 months remaining = $1,500). Supplemental tax bills are typically mailed within 60-90 days of the triggering event and become a lien on the property as of the date of change.

Example Calculation

Example 1: $300,000 Home

  • Assessed Value: $300,000
  • Senior Citizens Property Tax Credit Applied: -$1,000 (if eligible and applied for)
  • Net Taxable Value: $299,000
  • Tax Rate: 6.2000 per $100
  • Annual Tax: $1,853.80
  • Monthly Escrow: $154.48

Example 2: $600,000 Home

  • Assessed Value: $600,000
  • Homestead Preservation Credit Applied: -$2,000 (if eligible and applied for)
  • Net Taxable Value: $598,000
  • Tax Rate: 5.8000 per $100
  • Annual Tax: $3,468.40
  • Monthly Escrow: $289.03

Example 3: $1,000,000 Home

  • Assessed Value: $1,000,000
  • No Credits Applied: $0
  • Net Taxable Value: $1,000,000
  • Tax Rate: 5.5000 per $100
  • Annual Tax: $5,500.00
  • Monthly Escrow: $458.33

Note: All tax credits require separate application and approval. Credits shown are examples and actual eligibility varies.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Warren County require property tax escrow accounts, collecting 1/12 of your annual property tax bill with each monthly mortgage payment. Your lender receives tax bills directly from the Warren County Collector and pays them on your behalf by the due dates: February 1, May 1, August 1, and November 1 (with a 10-day grace period). Lenders typically maintain a cushion of 2-3 months of tax payments in your escrow account to ensure sufficient funds.

You'll receive an annual escrow analysis from your lender, usually around the anniversary of your loan, which may result in payment adjustments based on actual tax bills versus estimates. If your taxes increase due to reassessment or rate changes, your monthly escrow payment will increase accordingly. You can verify that your lender paid your taxes correctly by checking with the Warren County Collector's office or viewing payment records online.

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 Warren County property taxes due for the 2025 tax year? A: Property taxes are due quarterly on February 1, May 1, August 1, and November 1, with a 10-day grace period. Delinquent notices are mailed after each grace period expires.

Q: What tax credits are available and how do I apply? A: Warren County offers several tax credits including Senior Citizens Property Tax Credit (age 65+), Disabled Persons Property Tax Credit, and Veterans Property Tax Credit. All require separate applications filed with the Warren County Assessor's office by March 1st annually. Contact (636) 456-3331 for applications.

Q: How does the Homestead Preservation Credit work? A: This credit limits annual assessment increases on your primary residence, typically capping growth at 10% per year rather than reducing your home's market value. You must apply annually by March 1st, and it's not automatic even if you qualified previously.

Q: When does Warren County reassess properties? A: Missouri requires reassessment every two years on odd-numbered years. The next county-wide reassessment will be for tax year 2025, with new values taking effect January 1, 2025.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed with the Warren County Board of Equalization by June 1st following the assessment year. You can appeal online, by mail, or in person with supporting documentation of your property's value.

Q: What are the penalties for late property tax payments? A: A 2% penalty is added after the 10-day grace period, followed by additional penalties and interest. Properties become subject to tax sale proceedings if taxes remain delinquent for multiple years.

Q: Can I pay my property taxes online? A: Yes, Warren County offers online payment options through their official website. You can pay by electronic check or credit card, though credit card payments may include processing fees.

Q: Why do properties in the same neighborhood have different tax rates? A: Tax rates vary based on which special taxing districts serve each property. Even neighboring homes may be in different school districts, fire districts, or other special districts, resulting in different combined tax rates.

Verified Sources

Backed by 10 Official Government Sources

Every fact in this guide is sourced from official county, state, and federal documents.

01
State
2025 Property Tax Rate Report - Missouri State Auditor's Officeauditor.mo.gov
02
Tax Doc
Property Tax Calculatorsauditor.mo.gov
03
County
Tax Rates for County: Warrenauditor.mo.gov
04
Missouri Department of Revenuedor.mo.gov
05
Tax Doc
Delinquent Taxeswarrencountyclerk.ky.gov
06
Tax Doc
Property Tax Bills - How & When To Paynewprov.us
07
Tax Doc
Subject Index TAXATION AND REVENUE - PROPERTYhouse.mo.gov
08
november-2019-990-index.csvirs.gov
09
PT 98-22 - Religious Ownership/Usetax.illinois.gov
10
County
Warren County Financial Statementsauditor.mo.gov
All sources verified as of 2025 Tax Year

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