Are you really still paying tax in your previous living country? TBO, i also checked out from paying tax from where I receive my pension. Therefore the DTA might not be valid for me. Maybe I am naive, but I believe a. pensioners in Thailand are tax accountable, but b. the tax amount for pensioners in Thailand remains 0%. Until there are any further valid information from the Thai Tax Dept I will not do anything. Don’t trust all the surrounding information that come from third hand!