I am helping someone file taxes for their Swiss pension. Most of the funds (90-95%) are transferred every month from Switzerland to Thailand via wire transfer. It doesn't come from savings but straight from the pension (pension -> bank account in Switzerland -> bank account in Thailand). We went to the tax office in one of the major cities today and the officer said there's no need to file for taxes as pensions from outside of Thailand, only if there is income from a job or earnings from rentals, etc. and that pensions are not taxed plus there is a double tax agreement with Thailand and Switzerland. We informed them that no taxes are paid in Switzerland because the person lives here all year and the officer said still there's no need to pay taxes, as the amount of tax would be in her own words "very small" (around 30,000 Baht, after deduction of allowances) and the medical bills and other things that could be deducted are likely higher (the officer didn't even want to see those and we didn't mention any or bring any). I hope they will not come knocking at the door one day but they basically refused to even allow filing taxes or get a tax number.