Ala. Code § 45-36-232.23
For the purposes of this subpart, the term net income shall be defined as total salaries, wages, and other compensation received by a person committed to a jail in Jackson County for work performed while such person is released pursuant to this subpart, less all sums withheld for federal income tax, state income tax, taxes paid by any employee under the so-called Federal Insurance Contributions Act, group insurance, and union dues. Any person released from jail pursuant to this subpart shall pay to the county a sum equal to 20 percent of his or her net earnings earned while so released; provided, however, that no person so released shall be required to pay more than one hundred dollars ($100) to the court in any one calendar month under this subpart. The court having jurisdiction of the case, as a condition to releasing a prisoner pursuant to this subpart, may require that the prisoner establish a payroll deduction for the payment of any sums due hereunder. All sums so collected, whether by payroll deduction or otherwise, shall be paid over to and collected by the Jackson County Commission and deposited to a separate fund to be known as the Jackson County Work Release and Pretrial Release Fund.
Ala. Code § 45-36-232.23 (1975)