and of course the Thai's made it really vague and difficult to negotiate. The basic issue is the definition of "remittance" and remiting funds here. Which if you use a credit card doesn't happen but again nobody has yet answered that one.
you're lucky military pensions are exempt from tax in Thai law. Other pensions are not. For the USA people they need the TIN on the forms. Most other countries have the equivalent of a TIN but its not that simple. Unfortunately this American lead nonsense isn't going away it seems.
theres only one from my experience doing accounts last week with a few of us there. The American did a w2 which is a USA form. Its mentioned in loads of movies so that i know.