There are 4 main work permit sub-categories for directly employed workers:
The Type A permit is for temporary and/or seasonal workers, and is valid for a maximum of 9 months
The Type B Initial permit is for long term workers, is valid for for a maximum of 1 year, and can be renewed (this permit can lead to the Type B Renewed permit)
The Type B Renewed permit is for workers whose Type B Initial permit has expired, and allows them to continue under the same conditions as their initial work permit for a maximum of 2 years (this permit can lead to the Type C permit)
The Type C permit is for workers whose Type B Renewed permit has expired, and allows them to live and work in Spain indefinitely. However, it must be renewed every 5 years
Next Section: Who needs a work permit?