What documents do I need to prepare for working remotely in Thailand as a freelancer with a new business?

To work remotely in Thailand either as a freelancer with a new business or under a normal employment contract, you should prepare specific documents. For a new business, a registration and freelance portfolio are sufficient, even without tax returns. Additionally, if you have a normal contract, you will need a letter from your employer confirming your ability to work remotely and stating that you will not conduct business with Thai firms.