St. Louis County homeowners can appeal to the Board of Equalization by July 13, 2026. The informal review, the hearing, and what the carried-over value means.
St. Louis County homeowners can appeal their assessment to the county Board of Equalization between May 1 and the second Monday in July, which is July 13 in 2026. An informal review with the assessor's office runs first, the hearing can happen by phone, and a state-level appeal remains open after.
When is the St. Louis County property tax appeal deadline?
The Board of Equalization accepts appeals from May 1 through the second Monday in July, July 13 in 2026. Missouri sets residential values in odd-numbered years, so the value on the books in 2026 is the 2025 number carried forward unchanged. The deadline applies all the same: an even-year appeal contests that carried-over value for the 2026 bill.
How does the appeal process work?
The recommended first step is an informal review with the assessor's office, which resolves some cases without a formal appeal. The formal route is the Board of Equalization in Clayton: every timely appeal gets a scheduled hearing, held in person or by phone, and a homeowner can also waive the appearance and have the board decide on the submitted case. Decision letters mail in the fall. After the board, the Missouri State Tax Commission hears appeals at no charge, with a deadline of September 30 or thirty days after the board's decision, whichever is later.
Can you appeal in 2026 if values were set in 2025?
Yes, with one condition: Missouri allows an even-year appeal of the carried-over value as long as the owner did not appeal the same value the year before, and the decision affects only the even year's bill. The stakes are not small. The 2023 reassessment alone pushed county residential values up 12 to 24 percent depending on the area, and the assessor's office made roughly 146,000 site visits that year because values jumping more than 15 percent require one.
Look up if you are overpaying on your St. Louis County home.
What evidence do you need for a St. Louis County appeal?
An appeal turns on what the home would actually sell for, not on how much the bill went up. Mass appraisal is built to be right on average, and no house is an average. Finding that gap and presenting it to the board is its own skill. Fair Appeal manages the case through resolution on the homeowner's behalf; there is no upfront cost, and you owe nothing unless FairAppeal wins a reduction.
How much is at stake?
The median county home runs about $300,000 and the effective tax rate is roughly 1.25 percent of market value, so a 10 percent reduction is worth in the neighborhood of $375 a year. The county's senior freeze drew more than 82,000 applications, but it freezes only operating levies and only for owners 62 and up. An assessment appeal lowers the base of the bill for any homeowner.
What is the bottom line on appealing in St. Louis County?
Appeals run May 1 through July 13, 2026, the hearing can happen by phone or on paper, and the value being contested is the 2025 number carried into 2026. The next countywide reassessment lands in 2027 and will grow from the value set now.
Related reading: the even-year appeal rule and how appeals work in Jackson County.