Karen, on Crystal, on board credit cannot be used for future cruise deposits (unless your credit is cash sent for you by a friend or yourself as opposed to Crystal Society on board credit) or for the Caesar's casino. With the price of a cruise, this will probably sound silly, but it bothers me to leave any of the on board credit on the ship. I check our account a couple of times on a cruise to make sure I've used it up. By this time, we get a rather large amount, and I make sure to spend it all! Judith