untaxed
adjective
Definitions
Not subject to being taxed.
Example: During August, clothes costing less than $75 are untaxed, to try to help the poor to buy clothes and the merchants to make money.
Not having had the required taxes paid on it.
Example: Bootleggers make good money selling untaxed cigarettes, until they are caught.
Not tired or strained, working well within capacity.
Example: The motor was untaxed by the steep hill because the vehicle was so lightly loaded.