(a) A nonresident may claim and shall include only the part attributable to Maryland, as determined under this section, of: (1) the subtractions from federal adjusted gross income under § 10-208 of this subtitle; (2) the deduction for exemptions under § 10-211 or § 10-212 of this subtitle; and (3) (i) the standard deduction under § 10-217 of this subtitle; or (ii) itemized deductions under § 10-218 of this subtitle. (b) Unless the Comptroller requires or allows another method to compute the items listed in subsection (a) of this section, a nonresident shall prorate the items using a fraction: (1) the numerator of which is the Maryland adjusted gross income of the nonresident; and (2) the denominator of which is the federal adjusted gross income of the nonresident.
Maryland Legal Code