If your St. Louis County property assessment seems too high, you are not stuck with it. Homeowners have the right to appeal their property’s value or classification through the St. Louis County Board of Equalization. The appeal window runs from May 1 through the second Monday in July each year. For 2026, the deadline is July 13, 2026.

What Is a Property Assessment?

A property assessment is the county’s opinion of your home’s value for tax purposes. If that value is too high, it can lead to higher property taxes.

Can You Appeal a Property Assessment in St. Louis County?

Yes. St. Louis County allows property owners to appeal the value or classification of their real estate or personal property.

When Is the St. Louis County Property Appeal Deadline?

Appeals can be filed between May 1 and the second Monday in July. For the 2026 assessment year, the deadline is July 13, 2026.

Where Do You File a Property Tax Appeal in St. Louis County?

St. Louis County provides an online appeal portal, and supporting documents may also be submitted by email, mail, or drop-off. The Board of Equalization address is:

St. Louis County Board of Equalization
41 South Central Avenue
Clayton, MO 63105

What Evidence Helps Support a Property Assessment Appeal?

Do not just say you disagree with the value. Show why.

Helpful evidence may include:

• recent comparable sales

• a recent appraisal

• photos showing condition issues

• proof the county’s property facts are incorrect

• other documents supporting your opinion of value

St. Louis County encourages property owners to submit evidence with the appeal.

What Happens After You File?

If your appeal is filed on time, a hearing may be scheduled. You can also waive the hearing and let the Board decide based on the documents you submitted. Decision letters are typically mailed after hearings conclude in the fall.

Can the Board Raise Your Value Instead?

Yes. The Board of Equalization can increase, decrease, or leave unchanged the value of the property under appeal. That is why it is important to submit a well-supported appeal, not just a rushed one.

What If You Disagree With the Appeal Decision?

If you still disagree after the Board’s decision, you may be able to appeal to the Missouri State Tax Commission. The Commission says complaints generally must be filed by September 30 of the assessment year or within 30 days of the Board’s decision, whichever is later.

Final Thoughts on Appealing a Property Assessment in St. Louis County

If your St. Louis County property assessment looks off, it is worth taking a closer look. The key is filing on time, using strong supporting evidence, and making sure the facts about your property are accurate.