Md. Code, Tax - General § 13–830

If the tax, interest, and penalty are not paid when due, the tax collector, without notice to the person who posted the security under § 13-829 of this subtitle, may:

(1) apply a cash or security deposit to the tax, interest, or penalty; or

(2) sell a security at public or private auction and apply the proceeds of the sale to the tax, interest, or penalty.