used to describe a product, service, or financial arrangement on which no taxes have to be paid

The poorest families pay no tax on food because their food stamp purchases are tax-exempt. 最贫困的家庭不用在食品上缴税，因为他们用食品卷购买是免税的。

used to describe a person or an organization that does not have to pay tax

the tax-exempt status of college athletic departments 大学体育部门的免税资格