I insured my car with Allianz, I paid for the whole year in advance...but now I am leaving CH and need to cancel it...do you know if I am entitled to claim back the CHFs for the time left (5 menths more or less)??
At you Cantons Strassenverkehrsamt / Service de Automobile you have to hand in your gray card and license plate. Maybe even possible per letter or directly in a post office.
It is also possible to just deposit your license plate w/o de-registration this may save your insurance fee and road tax (I used 'may' because there is a small processing fee).