I am a US citizen based in the US. I have an opportunity to work with a Swiss startup. I am wondering what my tax obligation is for 1) salary and 2) any equity in the company that fully vests. Do I pay tax in Switzerland or the US (hopefully not both)?
I understand location of where the work is performed can change taxation but I don't know the case for Switzerland. If it helps to know, I will be physically in the US all of 2021 and then between the US and Switzerland in 2022 onward.
The situation gets hazier in relation to equity. Do I need a work permit or anything else before I can legitimately accrue equity in a Swiss company?