Since the wording "Bonus" is used in German (same spelling) to reflect compensation based on the success of the company and is sometimes defined in advance (i.e., not discretionary), we should avoiding this blanket English translation. Nevertheless, the English word "bonus" does have quite a bit of functional equivalence to the German term, Bonifikation.
There are multiple definitions - click on the translation that matches your context.
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.