perquisite

A payment, profit, or benefit received in addition to a regular wage or salary, especially when due or expected.

Something regarded or claimed as an exclusive right by virtue of one's social position or rank: synonym: right.

A gratuity; a tip.

An incidental emolument, profit, gain, or fee, over and above the fixed or settled income, salary, or wages; something received incidentally and in addition to regular wages, salary, fees, etc.

In law, whatever one gets by industry or purchases with his money, as distinguished from things which come to him by descent.