NJHOUSE

There are places in Thailand with more temperature variation throughout the year such as Loei but the highs are pretty high during the summer. However, it does cool down quite a bit during winter.

FYI: If you've been in Thailand since Jan 1st, this Thursday is your last day to exit before becoming a resident for tax purposes. For many, this Friday things get real.

At first I thought that taxing residents' worldwide income was rare among countries but it appears, after some basic research, that this is a fairly common tax policy. Not sure of actual enforcement around the world, but this type of taxation is not out of the ordinary. Granted, some of the countries only tax foreign income if it is remitted but most places can tax it even if NOT remitted. At least this is what I see based on the following Wikipedia article: https://en.wikipedia.org/wiki/International_taxation There you can see pretty much all of Thailand's neighbors have laws on taxing of foreign income although I doubt Cambodia, Laos, Myanmar, Vietnam are able to enforce and collect!

When filing your federal taxes with the IRS, you'd be paying tax on the net gain which takes into account the cost basis of all your realized trades for that tax year. I cannot imagine how Thai taxes could be any different because surely you'd be presenting your US tax return as the basis for any tax liability in Thailand. No?