Ala. Code § 40-12-99
Each person practicing for the public the profession of civil, electrical, mining, mechanical, or radio engineering shall pay an annual license tax of $20 to the state, but no license shall be paid to the county. If such business is conducted as a firm or corporation in which more than one engineer is engaged, each engineer so engaged shall pay a license tax of $20. No such engineer shall be required to pay this license tax until after he has practiced his profession for two years in this state or elsewhere. An engineer who is an employee of the state or of any county or municipality at a fixed salary and who engages in no other engineering work for compensation is not subject to this license tax when so employed.
Ala. Code § 40-12-99 (1975)