Modifies provisions relating to notifications for increased property assessments

SB 1521 requires Missouri property assessors to send written notices to property owners when increasing a property's assessed value, with specific details about potential tax impacts. Notices must be delivered by June 15th and include projected tax liability (in reassessment years), a breakdown of tax rates by local government, and clear appeal instructions. Property owners directly affected by valuation increases receive these notifications, which must use clear formatting to highlight tax changes and deadlines. The bill also mandates that large-county assessors provide online access to valuation methods or phone-based alternatives for those without internet.