The standard tip amount will be chaged to your room account, beginning very soon. You may add to it with cash at the end of the cuise, go to guest services and add to it using our account or change the tip amount as you see fit. Cash or room charge, they are not taxed on the $ paid them. As far as do they pay taxes at home, you would hae to ask a CM. As to the bartenders or bar staff, I don't know if the auto tip and anything above goes to the server or the bartender or is split. I assume that if you order from a server, that person gets the tip, if you are at the bar and the bartender serves you, that person gets the tip. Again, you would have to ask them directly about taxes, anyone here, unless they have held that position, would be speculating.