Also from day 1 you must pay taxes on remote work (thai sourced income) even as a non resident and regardless of whther you remit it or not. Source: 5 accountants, all global accountancy firms published info, etc. You can offset this with DTAs with your country if they exist.
HI Lee. I am also from the UK. Can you please briefly summarise the income tax obligations for a UK citizen under DTV who plans to do 180d+180d every year in Thailand? Does the Thai remittance based taxation system apply?