Interest on obligations of the State of Mississippi and any political subdivision thereof is wholly exempt from tax. The term "obligations of the State of Mississippi" means any obligation backed by the credit of the State of Mississippi. "Any political subdivision" means any county, city or town including special districts such as road, water, sewer, reclamation, drainage, levee, school or similar districts. Interest received upon obligations of any state or its political subdivisions other than Mississippi is taxable.
35 Miss. Code. R. 3-02-04-104