Municipal Government - As introduced, prohibits a municipality, or an instrumentality of a municipality, from taking an action that affects or has the potential to affect the tax obligations, fees, or other costs for real property owners whose property is located outside of a municipality's corporate boundary, unless the action is approved by the county legislative body in which such property is located; requires the membership of joint economic and community development boards to proportionately represent the citizenry over which the board exercises jurisdiction by July 1, 2029. - Amends TCA Title 5 and Title 6.

SB 1404 prevents Tennessee municipalities or their agencies from changing taxes, fees, or costs for properties located outside city limits without approval from the county legislative body where those properties are situated. It also requires joint economic development boards to proportionally reflect the population of all cities and counties they serve by July 1, 2029, ensuring at least 90% of the county’s population is represented on these boards. The bill mandates that board appointments or elections after 2029 must gradually adjust representation to meet this requirement, with adjustments based on census data every decade. These changes directly affect property owners outside municipal boundaries and local development boards across Tennessee.