Md. Code Ann., Tax-Gen. § 10-703.2
(b) A credit against the State income tax in the amount determined under subsection (c) of this section may be claimed by a resident who recognizes income for the current taxable year for federal income tax purposes from an installment sale of property located in a state other than Maryland if:
(c) The amount of the credit allowed under this section is equal to the income recognized for federal income tax purposes for the current year on which state income tax was paid to another state in an earlier year, as described in subsection (b)(2) of this section, multiplied by the lesser of:
Added by Acts 1997, c. 320, § 1, eff. July 1, 1997.