Do you pay tax if you work on cruise ships?

If you're a US Citizen then you pay tax on your earnings. If you're based outside of the US e.g. Canada, UK, Ireland, Europe, Australia, New Zealand, South Africa, then your earnings are tax-free. You would still have to declare your earnings but they are not taxable. Go to http://www.WorkOnCruiseShips.com for more information on this subject.