Section 10-810 - Corporation return - In general(a) A corporation that, during a taxable year, has Maryland taxable income shall file an income tax return.(b) Notwithstanding the provisions of subsection (a) of this section, a corporation which is not otherwise required to file a return shall file a return if the corporation: (1) is not tax exempt under § 10-104 of this title;(2) is required to file a federal income tax return;(3) carries on business within this State; and(4) has income or losses attributable to sources within this State.