perpetual traveler

PT, also read as "prior taxpayer" or "permanent tourist".

Someone who travels from nation in such a way that he isn't considered resident in any of the nations he visits. This way, he doesn't have to pay income tax.
PT's often have their official residency in some sort of tax haven.

Also see Nomad Capitalist

Me: Why aren't you paying any taxes here, Jeff?
Jeff: Because I'm a perpetual traveler and not a resident of this country. Besides, taxes are theft.
Jeff takes a huge puff of smoke on his cigar and blows it in my face.