To clarify - you can't work on a Non-B (Business) visa. You can attend meetings, sign contracts, make investments etc. Non-B visas are also needed if you want

To clarify - you can't work on a Non-B (Business) visa. You can attend meetings, sign contracts, make investments etc. Non-B visas are also needed if you want to get a work permit. You can't get a work permit whilst on a tourist visa. Starting your own company in order to get a work permit requires 2,000,000 baht ($62,000) of registered capital and social security payments 4 Thai employees. There is also reasonably sized list of businesses you cannot start. You also can't own your businesses outright unless it's approved by the Board of Investment. It's very difficult to do business there legally.