Want to play it by the book: tell your manager about it. Be prepared to get fucked in your yearly perf review for "not performing" even if you do exactly what y

Want to play it by the book: tell your manager about it. Be prepared to get fucked in your yearly perf review for "not performing" even if you do exactly what you did before. Want to avoid the drama: don't tell anyone, then leave if/when you get traction. The less they know - the better. I've seen people take both of these paths, the second one worked much better. That having been said - it's highly individual and dependent on circumstances. E.g. if you're high up the chain of command there will be more scrutiny over what you do after you leave. For most of us, it's not a huge concern.