If you will work in Thailand — including managing your own company — you need a Non-Immigrant B visa and a work permit. The work permit application is made through your Thai company, which must meet capital and Thai-employee conditions unless an exemption applies.
BOI-promoted companies get a faster, more flexible route: foreign specialists and executives apply through the BOI one-stop service with relaxed quota requirements. There are also newer long-stay options for investors and remote workers, but these do not replace a work permit if you are operating a local business day to day.
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Information on investment, BOI, taxation, immigration, company structures and regulations is provided for general information only and should be independently verified with qualified Thai professionals and the relevant government authorities.