The earliest the articles of impeachment could be transmitted to the Senate is January 20th at 1PM
But once Trump leaves office, the Senate can't hold an impeachment trial.
So why do it? Figure that one out.
Maybe somethings coming they're trying to stop....
Kek
This touches on it, but isn't comprehensive. Basically, it's used to keep you from holding any other elected offices, and I think you lose you SS protection and possibly whatever else a retired president gets, not exactly sure on that though.