So i'm a guy that actually meets the requirements for this at what is mentioned here. And it is still beneficial for me to work in my home country for 6 months, finish the contract work in Australia, end my rental, and then go to Thailand for another 6 months with all the money saved up rather than this visa...
Firstly, I pay over 30% tax in my home country. If Thailand are going to add 17% tax, that means I'll be paying 47% tax. Not worth it. Also finding a business structure which allows me to setup my company so i can be overseas is not easy either. So will Thailand honor double taxation agreements with this 17% tax or will I have to pay it on top of my taxes back home?
Normally in Thailand, if you stay less than 6 months, you are not a tax resident of Thailand. Will Thailand keep this rule? Meaning if I work on this visa but only spend 5 months in Thailand, I won't need to pay tax in the international (Income from my home country) income? That's a doable scenario. Kind of like how Columbia's digital nomad works.
And then there is the problem of residency. I'm Australian. I did some research on this on how this will work on the Australian end. So I can do this through a sole trader business, but a pty ltd (Proprietary limited company) company is a no go because Australia requires one of the directors of the company to be an Australian resident and maintain an Australian address.
What this means in laymans terms is while I could work remotely overseas, i'd still have to maintain an address back home in Australia which means i'm paying rent and flying home every 2 months to maintain the property gathering spider webs, this is along with paying 47% tax - What a bargain steal!). The only way out of this is to appoint a director to my company which costs more money, will need to write up a company constitution and get lawyers.
The way i'd setup for a sole trader living overseas would be to pay Australian taxes at the non resident rate. So the total tax look like Australian non resident tax rate + 17% tax Thailand wants.. while running as a sole trader.. ouch... Then I need australian employers to be ok doing business with an australian sole trader with an overseas address. I wonder how they will react to that as they have never seen anything like it!
Really Thailand should only tax on this visa if you can setup a company in Thailand instead or at least offer a tax free time period.