Md. Code, Tax - Property § 2–207

(a) In this section, “taxing official” means:

(1) as to the federal government:

(i) any official of the United States Treasury Department; or

(ii) any collector of federal taxes; and

(2) as to the government of any state, any state official who is responsible under the law of that state for:

(i) the assessment process;

(ii) the imposition of taxes; or

(iii) the collection of taxes.

(b) (1) Subject to subsection (c) of this section and notwithstanding any other provision of law, the Department may provide a tax official of another state or of the federal government with information that relates to:

(i) the assessment process;

(ii) the imposition of taxes;

(iii) the collection of taxes; or

(iv) any other tax matter.

(2) The information that the Department may provide under this section may be obtained from:

(i) any tax report or return that is filed under law; or

(ii) any tax audit or investigation.

(c) The Department may provide information under this section only if:

(1) the Department is satisfied that the information will be used for tax purposes only; and

(2) the federal or state government to which the information is to be released provides similar information to the tax officials of this State.