Property Tax Appeals in Platte County, Missouri
Platte County homeowners who disagree with their property's valuation may request an informal meeting with the Assessor's Office through the end of June, and if unresolved, file a Board of Equalization appeal form with the County Clerk's Office. Platte County's Board of Equalization page states that completed forms must be postmarked or turned in prior to the second Monday in July, and the county's 2026 BOE Appeal Form specified a Sunday, July 12, 2026 submission date ahead of that Monday. The regular 2026 window is closed as of this review, and Platte County has not published an exact 2027 filing date; verify the county's current Board of Equalization guidance before relying on a 2027 filing date. FairPath's owner-guided evidence packet is available for Platte County properties to help organize county records, comparable sales, and condition documentation for the owner's own appeal. It does not attend the informal meeting, file the Board of Equalization appeal, or represent the owner before the Board or the State Tax Commission.
Assessment context: Platte County's Board of Equalization page explains that the Missouri State Tax Commission sent the county an Equalization Order on July 30, 2025 directing a 15 percent increase to residential assessments over the prior assessments, excluding new construction and improvements, and that the county entered into an agreement with the Commission for a 6.835 percent increase over 2024 assessments through an Equalization Order of Understanding executed August 19, 2025. The page quotes Missouri Revised Statutes §138.030.2, including "The board shall not reduce the valuation of the real or tangible personal property below the value thereof as fixed by the state tax commission." It states that, as a result, "the BOE will be especially limited in its ability to reduce the 2025 valuation of residential property," and that the Board's ability to reduce that valuation due to casualty such as fire, flood and/or demolition will remain unchanged. The page provides this notice as additional information for 2026.
Filing process: An owner starts by requesting an informal hearing directly with the Assessor's Office, available through the end of June, to discuss the valuation. If the owner and the Assessor's Office cannot agree, the owner is unsatisfied with that result, or prefers to deal directly with the Board, the next step is a BOE hearing held during July at the Sheriff's Office in Kansas City; all requests for BOE appeals go through the Clerk's Office, using the online appeals information or a paper application available at the Clerk's Office in Platte City. Completed forms must be postmarked or turned in prior to the second Monday in July, and the county's 2026 form specified July 12, 2026 as that year's exact date. After the Board rules, an owner may appeal to the Missouri State Tax Commission within 30 days of the Board's final action or by September 30, whichever is later.
Evidence to review: Platte County's Board of Equalization page describes the equalization-order context rather than a document checklist, and states that the Board has authority to lower, keep the same, or raise the valuation of parcels. The informal hearing with the Assessor's Office is where an owner can learn which records and factors were used to set the value before deciding what documentation to bring to a Board hearing. FairPath can help an owner organize county parcel records, comparable sales, and condition or casualty documentation for either the informal meeting or the Board hearing; it does not attend either one, select the value the owner presents, or predict the Board's or the Commission's decision.
Current deadline guidance: The 2026 window closed before July 13, 2026 (the county's 2026 BOE Appeal Form set a July 12, 2026 submission date). Platte County's Board of Equalization page states that completed appeal forms must be postmarked or turned in prior to the second Monday in July, consistent with Missouri Revised Statutes Chapter 138. The county's 2026 BOE Appeal Form specified that appeals be postmarked or received by Sunday, July 12, 2026, ahead of that second Monday. The regular 2026 window is closed as of this review. The county has not published an exact 2027 filing schedule, so a specific 2027 date is not stated here; verify the county's current Board of Equalization guidance before relying on a 2027 filing date.
Platte County's Board of Equalization page, as information for 2026, describes the State Tax Commission's 2025 Equalization Order (15 percent) and the county's agreement for a 6.835 percent residential increase over 2024 assessments, and quotes Missouri Revised Statutes §138.030.2.
The page states that the Board will be especially limited in its ability to reduce the 2025 valuation of residential property, and that its ability to reduce that valuation due to casualty such as fire, flood and/or demolition will remain unchanged.
The county's 2026 BOE Appeal Form set a specific Sunday, July 12, 2026 submission date, one day ahead of the second Monday in July described on the Board's general page, so an owner should check the current year's form for the exact date rather than relying on the general rule alone.
BOE hearings are held at the Sheriff's Office in Kansas City rather than the County Clerk's Platte City office where forms are filed, so an owner should confirm the hearing location separately from the filing address.
Official filing authority: Platte County Board of Equalization. https://www.co.platte.mo.us/board-of-equalization
Source: Platte County, Missouri, Board of Equalization, https://www.co.platte.mo.us/board-of-equalization. Reviewed 2026-09-22.
Source: Platte County Clerk's Office, Platte County, Missouri, BOE Appeal Form 2026, https://www.co.platte.mo.us/media/Department%20Documents/County%20Clerk/BOE/BOE%20Appeal%20Form%202026%20Fillable.pdf. Reviewed 2026-09-22.
Source: Missouri Revisor of Statutes, Missouri Revised Statutes Chapter 138, https://revisor.mo.gov/main/OneSection.aspx?section=138.030. Reviewed 2026-09-22.
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