It just all depends on you country of residence.. I have spoken here to the tax authorities and I have a written confirmation that with the the taxation agreement between Korea and my county of residence they will not tax me extra here! I I would work in Japan, they will tax me the full here in my country of residence. another example if I would work in Qatar, then they would charge me 25%. So all in all, a good research is required and it's very different fo all the country's