解雇会计的时候该怎么说

你的问题不明确，是告诉你怎么说？
还是翻译这句话？

It's time to fire the accountant.

It is time to fire the accountant.这个是日常口语说的。
正式说法是
It is time to terminate the accountant.

As our company is downsizing, and people in finaance dept are more than enough. So after close consideration in the Board Meeting,the name list of those who have to leave come out.and now I get a bad news for you.I am sorry. you really did a pretty good job here,you are loyal and diligent and I can always rely upon.I am sorry but i have no choice.i believe you can find a better carrer in another company.