Modifies provisions relating to erroneous property classifications

SB 987 modifies Missouri's property tax appeal process, primarily affecting property owners who dispute assessment errors. It clarifies pathways to appeal to the state tax commission (within 30 days after local board decisions) and establishes new procedures for impounding disputed taxes during appeals. Key provisions include requiring the commission to correct unlawful assessments and adding a significant new rule: taxpayers who win challenges to erroneous classifications receive attorney fees and costs, plus 10% of the property's value in damages if fees aren't awarded by January 1, 2024. The bill also standardizes notice requirements for county collectors regarding pending appeals.