Maryland Code, Business Regulation § 17-20A-02

(a)(1) Before conducting business in the State, a transient vendor shall obtain a transient vendor's license.

(2) The Comptroller may not issue a transient vendor's license unless the transient vendor has a sales and use tax license and any necessary trader's license and has paid all State taxes.

(3) An application for a transient vendor's license shall be in the form and contain the information that the Comptroller requires by regulation.

(4) A license required under this section shall be valid for not more than 90 days.

(5) The Comptroller may not renew a license required under this section unless the transient vendor has a sales and use tax license and any necessary trader's license and has paid all State taxes.