Perquisite

noun

1. (chiefly in the plural) Any monetary or other incidental benefit beyond salary.

   "The perquisites of this job include health insurance and a performance bonus."

2. A gratuity.

   "After the wonderful service that evening he didn’t hesitate in laying a substantial perquisite on the table."

3. A privilege or possession held or claimed exclusively by a certain person, group or class.

   "Private jets and motor yachts are a perquisite of the rich."