Missouri sets new real-property values in odd-numbered years. State law says “new assessed values shall be determined as of January first of each odd-numbered year,” and Jackson County’s Assessment Department says real property “is reassessed every odd-numbered year.” That makes 2027 a reassessment year.
When notices arrive
Jackson County has not published a 2027 mailing date for value change notices. In 2025, the county announced on June 5 that its Assessor’s Office had begun mailing 2025 value change notices in phases.
For counties with a charter form of government (other than counties adopting one after January 1, 2008), RSMo 137.180 requires the assessor to notify the record owner of an increase “on or before June fifteenth” and, in a year of general reassessment, to notify the owner of the projected tax liability likely to result from the increase.
Informal review
Jackson County’s assessment FAQ says owners can present evidence of value “to the Assessment Department through the online Informal Review application.” The county pages reviewed for this article do not publish a 2027 informal-review deadline.
The Board of Equalization deadline
RSMo 137.385 says an appeal “shall be lodged with the county clerk as secretary of the board of equalization before the second Monday in July” and that the board may extend the time. Jackson County’s Board of Equalization appeals page says the appeal and supporting documents “must be filed to the Board of Equalization on or before the second Monday in July,” and lists July 13, 2026 as the deadline for the 2026 tax year. The county has not yet published a 2027 date.
Two county statements differ. A frequently asked questions answer on the county’s main Board of Equalization page gives “the 3rd Monday in June” as the deadline. The statute and the county’s appeals page use the second Monday in July. The statute also says “before” the second Monday, while the county’s appeals page says “on or before.” The Board of Equalization (816-881-3309) can confirm the 2027 date once it is set.
The county says appeals are filed through its online appeal system and that “no appeal application will be accepted by email or fax.”
After the Board of Equalization
A Board of Equalization decision can be appealed to the Missouri State Tax Commission. The Commission’s appeal page says the complaint “must be filed with the State Tax Commission on or before September 30 of the year of assessment or within thirty (30) days of the decision of the Board of Equalization, whichever is later,” and that the Commission cannot extend these deadlines.
What FairPath does
FairPath organizes the public record, comparable properties the homeowner selects, and condition facts the homeowner documents into a reviewed evidence packet. The homeowner decides whether to file, files through the official process, and attends any hearing. FairPath does not file, represent the homeowner, or guarantee acceptance, a value change, or any other outcome.
Official sources
Sources checked October 20, 2026. Instructions and dates can change, so confirm the current official page before filing.
Check your property free: FairPath’s Jackson County guide starts with your address and shows what the county’s own record says.