(a) (1) In addition to any other deductions allowed under this subtitle, an inmate may be allowed a deduction of 5 days from the inmate’s term of confinement for each calendar month during which the inmate manifests satisfactory performance of assigned work tasks.

(2) The deduction described in paragraph (1) of this subsection shall be calculated:

(i) from the first day that the work task is performed; and

(ii) on a prorated basis for any portion of a calendar month during which the inmate performed the work task.

(b) The Commissioner shall adopt regulations governing the determination of deductions authorized under this section.