Maryland Code, Environment § 1-203

(b)(1) A license or permit is considered renewed for purposes of this subsection if the license or permit is issued by a unit of State government to a person for the period immediately following a period for which the person previously possessed the same or a substantially similar license.

(2) Before any license or permit may be renewed under this article, the issuing authority shall verify through the Office of the Comptroller that the applicant has paid all undisputed taxes and unemployment insurance contributions payable to the Comptroller or the Secretary of Labor or that the applicant has provided for payment in a manner satisfactory to the unit responsible for collection.