This is not EU specific, duty is typically due on consumer good when you move them between countries if you haven't owned them long enough. It's not always en

This is not EU specific, duty is typically due on consumer good when you move them between countries if you haven't owned them long enough. It's not always enforced or enforceable of course, but it's there. See for example people buying cars on either side of the US and Canada border for use on the other side.