fatfather

I posted this topic already to Sunbelt, but due to an insufficient answer I try it here again, maybe someone is in a similar situation. My question to Sunbelt was:
  I'm on the way to quitt my employment and change over to freelance work. I'll work abroad but live in Thailand. How to manage this here in Thailand without running in problems with tax authorities here? I'll need a tax number for billing my customers. Do I have to found a company even no money is made here in Thailand, does a tax number require a work permit how to establish my freelance job legally?

  Sunbelt answers:
  You don't state what kind of work you will be doing? If your work is done online but inside the Kingdom of Thailand then that is considered working in Thailand and you will need to set up a company with the usual 2 million baht capital and Thai employees to obtain a work permit.

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I'm working as a service engineer in the oil/gas fields and I'm not going to do any work inside Thailand. The customers are spread all over the world and will contract me for projects. As far as I know I will need a tax number for billing. How to manage this without running in troubles with Thai tax authoriyies.

fatfather

I'm on the way to quitt my employment and change over to freelance work. I'll work abroad but live in Thailand. How to manage this here in Thailand without running in problems with tax authorities here? I'll need a tax number for billing my customers. Do I have to found a company even no money is made here in Thailand, does a tax number require a work permit how to establish my freelance job legally?