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Bonus?! What bonus?
Holiday bonus. Bonus tracks. Bonus features.
The noun bonus is only informally used as a verb (to bonus: to give or allow a bonus or leeway). The -ing form would be "bonussing" when used.
Corrections can be:
Why did you give me a bonus?
Why did you not give me a bonus?
Why didn't you give me a bonus?
A bonus is exactly that, a bonus. There is no requirement for there to be any calculation regarding a bonus.