Md. Code, Tax - General § 13–826

The following securities are acceptable:

(1) a bond issued by a surety company that is authorized to do business in the State and is approved by the State Insurance Commissioner as to solvency and responsibility;

(2) cash in an amount that the tax collector approves;

(3) marketable securities that the tax collector approves; or

(4) for admissions and amusement tax, alcoholic beverage tax, boxing and wrestling tax, and tobacco tax, an irrevocable letter of credit:

(i) in an amount that the Comptroller approves; and

(ii) with a date certain for coverage during the collection period.