Re: PhD fellow getting salary outside CH
Generally yes, you need to pay taxes if you live in CH.
For a Phd student its a bit different sometimes if you come on a scholarship / stipend from your home country then you have two cases. If the external source pays you directly or sends the money to your university/company to pay you and your lab expenses. In the second case I'm pretty sure taxes would be deducted before you receive the salary, for the first case you need to get the details from the finance department of your swiss employer or tax office in your city canton.