Md. Code, Commercial Law § 15–601.1

(a) In this section, “disposable wages” means the part of wages that remain after deduction of any amount required to be withheld by law.

(b) The following are exempt from attachment:

(1) The greater of:

(i) 75 percent of the disposable wages due; or

(ii) 30 times the State minimum hourly wage in effect at the time the wages are due, multiplied by the number of weeks during which the wages due were earned; and

(2) Any medical insurance payment deducted from an employee’s wages by the employer.

(c) The amount subject to attachment shall be calculated per pay period.