If you own residential or commercial property in the St. Louis metro area, 2025 could bring an update to your property’s assessed value — and potentially your tax bill.
In this guide, we’ll walk through:
• What a property reassessment is
• Which counties are reassessing in 2025
• How it affects your property taxes
• What to do if you believe your assessment is incorrect
• How a professional appraiser can support you in this process
Let’s break it down.
🏠 What Is a Property Reassessment?
A property reassessment is a periodic review of your property’s market value by your local assessor’s office. The goal? To ensure tax burdens are distributed fairly and reflect current market conditions.
Assessments can go up, down, or stay the same — depending on changes in the local real estate market and your specific property.
📅 2025 Reassessment Schedule by State & County
Missouri Counties
Missouri law requires property to be reassessed every odd-numbered year, including 2025. That means the following counties are all reassessing this year:
• St. Louis County Assessor’s Office
• St. Louis City Assessor’s Office
• St. Charles County Assessor’s Office
Illinois Counties
Illinois uses a quadrennial (four-year) reassessment cycle, which varies by county. Here’s the latest:
• St. Clair County Assessor’s Office
✅ Reassessment in 2025 (District 2): Includes Belleville, St. Clair, Shiloh Valley, Freeburg, New Athens, and Fayetteville.
💸 How Reassessments Impact Your Property Taxes
Your property’s assessed value is used to calculate your property taxes.
• If your assessment goes up, your tax bill may rise — unless tax rates drop.
• If your assessment drops, you could see savings.
• If the value seems unreasonably high, it may be worth reviewing and possibly appealing.
It’s important to note: the assessor doesn’t set your tax bill — they determine your property’s value. Tax rates are applied by other taxing bodies (school districts, municipalities, etc.).
🧾 What If You Disagree With Your Assessment
If your notice seems off, don’t panic — you may have options to appeal. Here’s how:
1. Review the Notice Carefully
Look for incorrect square footage, lot size, or building details.
2. Gather Supporting Evidence
Comparable recent sales, photos, repair estimates, or an independent appraisal can all help.
3. File an Appeal by the Deadline
Each county has its own process and deadlines — start with their website (linked above).
🛠️ How a Professional Appraiser Can Help
Getting an independent appraisal can provide clarity and peace of mind — especially if you’re considering an appeal.
An appraiser can:
• Deliver a neutral, third-party opinion of your property’s value
. • Help determine whether your assessment is fair
• Strengthen your appeal documentation
• Reduce the emotional guesswork from the process
At Authority Appraisals, we assist property owners, attorneys, and real estate professionals across Missouri and Illinois with valuation support — especially during reassessment years like 2025.
Ready to Appeal? Let’s Make Sure Your Valuation Holds Up
If you believe your assessment is inaccurate, the best next step is a third-party appraisal that provides clear, defensible support for your case.
At Authority Appraisals, we provide independent property tax appeal appraisals for:
• Residential and commercial properties
• Homeowners, attorneys, and real estate professionals
🔎 Want to learn more first?
👉 Visit our Real Estate Tax Appeal Appraisal page
📄 Need a quote?
📝 Ready to order now?
💬 Have questions?
👉 Contact us — we’re happy to help.
