Maryland Statutes
Part II - Returns and Declarations Generally
Section 10-812 - Corporation Return -- Exempt Corporations

(a)    A corporation exempt from income tax under § 10-104 of this title shall file an income tax return if the corporation:
        (1)    has unrelated business taxable income, as defined under § 512 of the Internal Revenue Code;
        (2)    is exempt from taxation under § 501(c)(2) of the Internal Revenue Code; or
        (3)    is an S corporation that is incorporated or does business in the State.
    (b)    An organization that is exempt from taxation under § 501(c)(3) or (4) of the Internal Revenue Code may file an income tax return to claim a refund under § 10-714 of this title.