Md. Code, Correctional Services § 3–704

(a) An incarcerated individual shall be allowed a deduction in advance from the incarcerated individual’s term of confinement.

(b) (1) The deduction allowed under subsection (a) of this section shall be calculated:

(i) from the first day of commitment to the custody of the Commissioner through the last day of the incarcerated individual’s term of confinement;

(ii) except as provided in paragraph (2) of this subsection, at the rate of 10 days for each calendar month; and

(iii) on a prorated basis for any portion of a calendar month.

(2) If an incarcerated individual’s term of confinement includes a consecutive or concurrent sentence for a crime of violence as defined in § 14–101 of the Criminal Law Article or a crime of manufacturing, distributing, dispensing, or possessing a controlled dangerous substance in violation of § 5–612 or § 5–613 of the Criminal Law Article, the deduction described in subsection (a) of this section shall be calculated at the rate of 5 days for each calendar month.

(c) A deduction under this section may not be allowed for a period during which an incarcerated individual does not receive credit for service of the incarcerated individual’s term of confinement, including a period:

(1) during which the incarcerated individual’s sentence is stayed;

(2) during which the incarcerated individual is not in the custody of the Commissioner because of escape; or

(3) for which the Maryland Parole Commission has declined to grant credit after revocation of parole or mandatory supervision.