Absoulty impossible to do. How would anyone know if the bundle of cash you have in your suitcase is from a taxed savings account or a columbian shipment of coke?
Correct which is why anyone shipping money in right now and prior to next year to buy a house/car/health insurance/veneers etc etc is certifiably nuts! whatever it's costing you, add at least 20%
You're putting a lot of faith in the thai authorities being up to speed with over 200 DTA's coming at them all at once! I've got a feeling EVERYONE will get taxed regardless and the onus will be on you to make the case to get a refund. Also different countries individual tax year ends (ie UK April, Thailand December etc) are going to cause carnage imo
Thailand is merely catching up with the west who don't seem to be getting the stick that the thais are now getting. 100% Cambodia and the Philippines and everywhere else will eventually fall into line. Why wouldn't they, a ton of tax receipts are just there for the taking