Actually PR and USVI use the IRS tax code, and for USVI add +10%. There are some local tax breaks in both place for international, non continental us business activity. PR does have some kind of tax break on 'investments' but I don't know if that is only for passive investments, as opposed to your own business. But this is a good suggestion as it is in the USA and is often a great tax deal, with the catch you have to spend less than 180 days per year in the actual states, and spend at least 6 weeks per year in those two US territories. I think you have to spend New Year's Eve there too!