Md. Code, Housing and Community Development § 4–252

The following are exempt at all times from taxation of every kind and nature whatsoever by the State, a political subdivision, or a governmental unit of any kind:

(1) a bond or note that the Administration issues under this part;

(2) the transfer of, interest payable on, or income derived from the bond or note; and

(3) profit realized by the sale or exchange of the bond or note.