answer:this is one of those gray area kind of questions. some follow the “finders keepers” ideology while others would question ethics. Are you positive that the extra 100 dollar wasn’t some sort of signing bonus or something? If I were you, I would call and ask the manager about the extra 100$ and then return the money. Now I don’t want to sound preachy at all, but if I was in your situation, I would return the money just to be on the safe side. but then, I am also easily guilt tripped about things To answer your question though, you would not get fined for “stealing money”, you can always say you didn’t count up the hours and just figured the amount would be right. And they will just send you a bill or something. Chances of the mistake being caught are slim. So it’s really a personal choice and a question of what you think is right or wrong. Hope that helps you make whatever decision is right for you.