There is no "leaving on very good terms." There's either "eligible for rehire" or not. That's it. Yes, for that particular manager in his/her particular mood, y

There is no "leaving on very good terms." There's either "eligible for rehire" or not. That's it. Yes, for that particular manager in his/her particular mood, you might be this great guy who will be missed, but no one else will give a rat's ass. If you think you have a good shot at getting severance out of it, tell them you're leaving. Otherwise, keep quiet and leave when you have a new job lined up. But why would they give you severance if you're going to leave of your own accord anyway?