There are multiple definitions - click on the translation that matches your context.
bonus means:
Gratifikation means:
Substantiv
partial
noun
Since there is in fact a recognized German word, "Bonus", and it refers to performance-based remuneration, which is narrower than the EN term "bonus", we would recommend using the neologism "special gratuitous bonus" because it more descriptive and would avoid confusion.
an extra amount of money that is added to someone's payment as a reward for performing well at work
The new administration is seeking to limit some bonus payouts.
something good that you get in addition to what you were expecting
It was an unexpected bonus for a man of fifty-one.