On Carnival its $9.75 per day/per person. This is for your waiter, bus boy and cabin stewart. Envelopes were left in your cabin and you handed the individual envelopes to these people during the dinner on your last night. I had no problem at all. The service was great, and the staff was a delight but... I've just heard that Carnival is starting to charge the tip on your sail card when you board. This I have a problem with.