Re: Study aboard with B/ C working permit
I'm not sure exactly what's required for it. The main thing is that you need to show that your centre of life will still be here so yes, maybe having your address here will be required. You may need to keep paying Swiss health insurance too, I don't know.
The 3 acceptable reasons are being sent to work abroad by your Swiss company, military service or further education. If you're a student at uni and not likely to be earning I can't see the tax issue would arise, but again it'll depend on exactly what you plan to do. Your gemeinde/commune is the best place to ask as they have to give permission for the permit to be put on hold and they'll have their own rules they work to - which, as we know in Switzerland, can vary from admin office to admin office.