You're fired, I'm afraid we're going to have to let you go, be/get sacked
In the world of international business there are different ways to dismiss someone from their job. In English, the word fire carries a heavy, negative connotation. If your leader says 'You're fired', it probably means you have caused a serious problem in order for that to happen (or maybe that s/he is really straight-forwards and a little rude).
Therefore, most frequently, it is common to say the following:
"I'm afraid we're going to have to let you go."
TIP: Even though in many situations I'm afraid is related to fearing something, here it is the equivalent of 'I'm sorry, but..." and it can be used when delivering any negative news (especially if it's not expected).
A less frequently used option used, but also correct option is saying be/get sacked. However, one thing is to be kept in mind: you may only say that in informal situations, where it is not being regarded as a serious, sad problem.
Check out three examples from TV shows:
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