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| Sounds like a long 'business trip'. Technically I think that if you are performing work in a country and contracted for the position you should be taxed in the country you're working in. It would depend if he is a permanent employee of a Belgian/UK company and working here a bit for them or if he was hired as a contractor just to work in CH.
Also you would need to look into the tax treaty between Belgium and CH which would normally cover his type of situation. It should also cover what type of permit he needs, from the sound of it he is on a tourist visa (?) and I would guess that is a big no-no... | |
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This is actually simple. He is non-resident working on a short term assignment in Switzerland. He therefore pays tax in the country in which he either lives or is employed (this can be more complicated) and not at all in Switzerland. Furthermore he does not require a work permit at all as he is a non-resident travelling in and leaving to go home every week or so. It might actually be beneficial for him to pay tax in CH instead of Switzerland but that is another story. The answer to the question is simply no he does not need a permit, does not need to inform anyone and the tax treaties play no role in this case.