Went to file for Thailand Tax last February at my local Tax Office in Ratchaburi. Rather than pursuing the route you took (seeking and NT code / no tax deducted at source in UK) I decided the lesser of two evils (or lesser level of ineptitude) was to do the following: Provided completed paper (English) versions of all the necessary Thai forms. Entered amount in Baht of tax withheld (UK Tax already paid on my UK pensions by PAYE), and submitted print out from the UK Government Gateway. tax.service.gov.uk/check-income-tax/income-tax Over an hour long session, the clerk struggled to enter into the 'system' from whence relief was being claimed - she wanted to know the 13 digit Thai code for the withholding tax, (of which there was none) and was thrown completely by my UK National Insurance number. The 'boss' was called, equally clueless, but, as lunch time was imminent, he accepted the UK print-out and my conversion rate (that day) into Thai Baht and he told the clerk to enter zero in the appropriate box for Thai tax payable. A struggle but a win. As I said, this was my preferred route, having dealt with Double Taxation ignorance from HMRC clerks three years ago, when I worked in China for a UK university and was taxed twice. in that instance, I submitted a long complaint about being taxed TWICE and finally got a reply, apology and compensation from somebody who seemed to understand their own rules.
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