I got that sorted out with the authorities when I completed my last tax return.
Hell, I even got like 110 USD back in taxes for 2005, in which I didnt even pay taxes
I do make everything as transparent as I can, swipe credit card where ever I land somewhere, keep updating my excel spreadsheet with work/travel/destinations, keep boarding passes etc., take pictures of all my passport visa's etc...Im not cheating or evading taxes, Im just making myself not liable anywhere.
They accepted that, since I provided all this info when I filed that tax paper, and Im out of their system until/if I want to return and take up residency again.