If you think your property’s assessed value is too high—and you're facing a bigger tax bill because of it—you’re not stuck. Property owners in St. Louis County and St. Charles County, Missouri, have the right to appeal their property tax assessments each year.

Here’s a step-by-step overview of how to do it in 2025:

✅ Step 1: Review Your Assessment Notice

Your county assessor sends out assessment notices in late spring. Don’t ignore it—this is your first opportunity to spot any errors or inflated values.

🔍 Step 2: Request an Informal Review (Optional)

St. Louis County

• Contact: Assessor’s Office at stlouiscountymo.gov

• Timing: Reviews typically occur in May or June

St. Charles County

• Contact: Call 636-949-7431

• Deadline: Request an informal hearing within 10 days of receiving your notice (late April–early June)

This step is optional, but it can resolve issues early—no formal appeal needed.

📄 Step 3: File a Formal Appeal with the Board of Equalization (BOE)

This is your official opportunity to challenge your property value.

• Deadline for both counties:
  📅 Monday, July 14, 2025 (Second Monday in July)

What You’ll Need:

• Completed appeal form (download from your county’s website)

• Supporting documentation, like:

  • A recent appraisal

  • Photos of the property’s condition

  • Comparable sales (comps)

  • Any evidence of errors in the county’s data

Where to File:

• St. Louis County: File online at stlouiscountymo.gov

• St. Charles County: Mail or drop off forms at
  📍 201 N. Second St., Room 541, St. Charles, MO 63301

What Happens Next:

• Hearings are scheduled in July or August

• You'll present your case (in person or over the phone) to the BOE panel

  “Don't forget: July 14, 2025, is the appeal deadline in both counties.”

  
  

🚪 Step 4: Appeal to the Missouri State Tax Commission (If Needed)

Still disagree with the result?

You can appeal to the Missouri State Tax Commission (STC).

• Deadline:
  📅 September 30 or within 30 days of the BOE decision
  📅 December 31 if you purchased the property after mid-June

How to File:

• File online at stc.mo.gov

• Or submit your Complaint for Review of Assessment by email (Legal@stc.mo.gov) or mail

ℹ️ Note: Legal entities (LLCs, corporations, trusts

Why an Appraiser Can Still Help — Even After You File

A certified appraisal can:

• Strengthen your case in a hearing

• Give clarity on why your assessment may have been off

• Help you plan for future appeals or real estate decisions

Even if you’ve already filed, getting a second opinion can protect your investment.

👋 Need Help Understanding Your Appeal Results?

Whether you’re just waiting or preparing for a hearing, Authority Appraisals can help you interpret your outcome, back up your numbers, or plan for future tax seasons.

👉 Request a Free Quote or Order Your Appraisal today!