HonestCasa logoHonestCasa
All Tax Guides
Updated 2025 Tax Year

Oregon County
Property Tax Guide

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

10 Official Sources
8 min read
Calculate Your True CostMortgage Calculator
Quick Facts
Tax Rate
Varies by district - base rate plus school, fire, and municipal districts. Contact assessor for specific rates.
1st Due
Dec 31
Exemptions
5+ Available
Section 1

How Property Tax Works

Oregon County, Missouri operates under the state's property tax system, which serves as a primary funding source for essential local services including schools, county government operations, fire protection, and other municipal services. Property taxes in Oregon County are assessed annually based on the property's assessed value, which is typically a percentage of the property's fair market value as determined by the county assessor.

The effective property tax rates in Oregon County vary by location within the county due to different combinations of special taxing districts, including school districts, fire districts, and municipal boundaries. Property owners in the City of Alton or City of Koshkonong may have different total tax rates than those in unincorporated areas. Missouri's base assessment rate is approximately 1% of market value, but the total tax burden depends on the specific levy rates set by each taxing jurisdiction where the property is located.

All property taxes are administered through the Oregon County Collector's office, with assessment values determined by the Oregon County Assessor. The county follows Missouri's standard assessment practices, with most residential property assessed at 19% of true value and commercial property at 32% of true value.

Section 2

What Makes Up Your Tax Bill

Note: 2025 official tax rates are pending release. Contact the Missouri State Auditor's Office for final certified rates.

ComponentRate (per $100 assessed value)Description
Oregon County General RevenueTBDCounty operations, services, infrastructure
School District LevyTBDVaries by district (funding education)
Municipal Levy (if applicable)TBDCity services for Alton, Koshkonong residents
Fire DistrictTBDFire protection services
Road DistrictTBDRoad maintenance and improvements
Library DistrictTBDPublic library services

Levy Year: FY 2025

Important: Your actual tax rate depends on which taxing districts serve your property location. Properties in the City of Alton (district 09-075-0001) and City of Koshkonong (district 09-075-0002) will have different rate combinations than rural properties. Contact the Oregon County Assessor at the courthouse for your specific district combination and current rates.

Section 3

When Are Property Taxes Due?

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

First Installment
Dec 31
Delinquent after Dec 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 Oregon County occur when there are mid-year changes to a property's assessed value that affect the current tax year. Common triggers include change of ownership, completion of new construction, additions or improvements to existing structures, or corrections to assessment errors discovered after the regular tax roll was completed.

When supplemental taxes are levied, they are calculated based on the difference between the original assessed value and the new assessed value, prorated for the portion of the tax year remaining. For example, if a property sells in March and the new assessment increases the value by $50,000, the supplemental tax would apply to the increased value for the remaining 9-10 months of that tax year.

Property owners receive a separate supplemental tax bill in addition to their regular annual tax statement. These supplemental bills follow the same payment rules and penalty structure as regular property taxes, with payment due by December 31st of the tax year in which they are issued.

Example Calculation

Note: Using estimated rates pending 2025 official certification. Actual taxes will vary based on specific taxing district combinations.

Example 1: $300,000 Home (Rural Oregon County)

  • Market Value: $300,000
  • Assessed Value (19% of market): $57,000
  • Less: Senior Credit (if applicable): -$0 (requires application)
  • Net Taxable Assessed Value: $57,000
  • Estimated Tax Rate: $3.50 per $100
  • Annual Tax: $1,995
  • Monthly (if escrowed): $166

Example 2: $600,000 Home (City of Alton)

  • Market Value: $600,000
  • Assessed Value (19% of market): $114,000
  • Less: Homestead Credit (if applicable): -$0 (requires application)
  • Net Taxable Assessed Value: $114,000
  • Estimated Tax Rate: $4.20 per $100
  • Annual Tax: $4,788
  • Monthly (if escrowed): $399

Example 3: $1,000,000 Home (City of Koshkonong)

  • Market Value: $1,000,000
  • Assessed Value (19% of market): $190,000
  • Less: Applied Credits: -$0 (most require annual application)
  • Net Taxable Assessed Value: $190,000
  • Estimated Tax Rate: $4.00 per $100
  • Annual Tax: $7,600
  • Monthly (if escrowed): $633

See How Taxes Affect Your Payment

Property taxes are just part of your total monthly cost. Get the full picture.

Calculate Now
Section 5

Escrow & Property Taxes

Most mortgage lenders in Oregon County require property tax escrow accounts for borrowers with less than 20% down payment. Your lender collects 1/12th of your estimated annual property tax bill each month along with your mortgage payment. The funds are held in a separate escrow account and the lender pays your property taxes directly to Oregon County when they become due on December 31st.

Lenders typically review escrow accounts annually and may adjust your monthly payment if property taxes increase or decrease significantly. You should receive an annual escrow statement showing the account activity, including tax payments made on your behalf. If your taxes increase due to reassessment or rate changes, your lender may require additional monthly contributions or a lump sum payment to cover any shortage.

Even with an escrow account, property owners remain ultimately responsible for ensuring taxes are paid timely. Monitor your escrow statements and verify that payments are made correctly. If you pay off your mortgage or refinance, you'll need to arrange direct payment to the Oregon County Collector'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 Oregon County property taxes due for FY 2025? A: All real estate taxes are due by December 31, 2025. You can pay in one lump sum or make payments in installments throughout the year, but the full amount must be paid by December 31st to avoid penalties.

Q: What are the penalties for late payment? A: Delinquent payments are subject to a one-time penalty of 2% plus interest at 2% per month until paid in full.

Q: What tax credits are available and how do I apply? A: Missouri offers various tax credits including senior citizen credits and disabled veteran credits. Most require annual application to the County Assessor's office. Contact the Oregon County Assessor for specific eligibility requirements and application deadlines.

Q: Is there a homestead credit that limits assessment increases? A: Missouri does not have a traditional homestead exemption that caps assessment growth. However, check with the Oregon County Assessor about any available homeowner credits that require application.

Q: How often are properties reassessed? A: Missouri law requires properties to be reassessed every two years. The Oregon County Assessor conducts regular reappraisals to ensure assessments reflect current market values.

Q: How do I appeal my property assessment? A: Assessment appeals must be filed with the Oregon County Board of Equalization. Contact the County Assessor's office for appeal forms and deadlines, typically in June following the assessment notice.

Q: Can I pay my property taxes online? A: Contact the Oregon County Collector's office to inquire about online payment options and accepted payment methods.

Q: Why do tax rates vary within Oregon County? A: Different areas are served by different combinations of school districts, fire districts, municipalities, and other special taxing districts. Your specific location determines which districts tax your property.

Q: Where can I get help with property tax questions? A: Contact the Oregon County Assessor for assessment and exemption questions, or the Oregon County Collector for payment and billing questions. Both offices are located at the Oregon County Courthouse in Alton, Missouri.

Q: Do I need to file annually for tax credits? A: Yes, most tax credits in Missouri require annual application by specific deadlines. Failure to reapply annually may result in loss of the credit. Contact the County Assessor for current application deadlines.

Verified Sources

Backed by 10 Official Government Sources

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

01
County
Tax Rates for County: Oregonauditor.mo.gov
02
State
2025 Property Tax Rate Report - Missouri State Auditor's Officeauditor.mo.gov
03
2025 Confidential Personal Property Return, 150-553-004oregon.gov
04
State
Real Estate Tax Informationstlouis-mo.gov
05
Tax Doc
2026 Tax Calendar - Missouri Department of Revenuedor.mo.gov
06
Tax Doc
Property Tax Payment Procedureoregon.gov
07
Homestead exemption Extraterritoriality In Re Stratton # ...orb.uscourts.gov
08
Tax Doc
PROPERTY TAX RELIEF PROGRAMS IN THE UNITED ...scstatehouse.gov
09
Tax Doc
Property Tax Credit - Missouri Department of Revenuedor.mo.gov
10
Tax Doc
Supplemental Property Taxesoctreasurer.gov
All sources verified as of 2025 Tax Year

See the Full Picture of Your Home Costs

Property taxes are just one piece of homeownership. HonestCasa helps you understand your total monthly cost and explore safe ways to access your home equity.

Total Monthly Cost

Mortgage + taxes + insurance + HOA

Equity Growth

Track how your equity grows over time

Safe Equity Access

Options for projects or debt payoff

Run Your ScenarioTry Calculator

Free • No credit check • 2-minute estimate