Maryland Tax - General Section 10-104
§ 10-104.
  The income tax does not apply to the income of:
    (1)   a common trust fund, as defined in § 3-501(b) of the Financial Institutions Article;
    (2)   except as provided in §§ 10-101(e)(3) and 10-304(2) of this title, an organization that is exempt from taxation under § 408(e)(1) or § 501 of the Internal Revenue Code;
    (3)   a financial institution that is subject to the financial institution franchise tax;
    (4)   a person subject to taxation under Title 6 of the Insurance Article;
    (5)   except as provided in § 10-102.1 of this subtitle, a partnership, as defined in § 761 of the Internal Revenue Code;
    (6)   except as provided in § 10-102.1 of this subtitle and § 10-304(3) of this title, an S corporation;
    (7)   except as provided in § 10-304(4) of this title, an investment conduit or a special exempt entity; or
    (8)   except as provided in § 10-102.1 of this subtitle, a limited liability company as defined under Title 4A of the Corporations and Associations Article to the extent that the company is taxable as a partnership, as defined in § 761 of the Internal Revenue Code.