Example of an exception. I American (on Non-O only) was in a 4 year relationship with a Thai woman (not married), and for the last two years we lived in a condo she had owned all along in Din Daeng. For some reason (I was giving her money for the mortgage, but that was informal) we decided to put me in her blue book as that would give me a yellow book and pink card; the process at the local office was not difficult. After we broke up I eventually discarded the yellow book with the irrelevant address, but the pink card, which never expires, still comes in handy. And FWIW, I have no current interest in activating the number on the pink card to be a TIN, partly because I'm in a situation where I only remit US SS. (Oh and I should add, the reason may have been that I was thereby exempt from filing 90 day reports, and so I did not, and never heard any protest from Immigration at time of extension.)