Md. Code, Business Regulation § 1–206

(a) A person who must have a license issued by the Department under this article but does not get the license on time shall pay, in addition to the required license fee, a late fee.

(b) The late fee shall be the sum of:

(1) up to 20% of the required license fee for the calendar month following the calendar month when the required license fee is due; and

(2) up to 4% of the required license fee for each calendar month or part of a month after that.