Dear ABO 944,
Fly MD is basically correct, it does depend on whether or not your present/real country of residence has a double taxation treaty with Switzerland. BUT that all depends on where you "live" - this word being defined differently by different tax authorities. Basically, in the case of Switzerland (and many other countries, but NOT all), this depends on how long (the number of days per year) you are actually "living" (& that can include a hotel) in Switzerland, compared with the number of days you are actually living at your "real home address". It also depends on "where" (in which country) the tax authoriities deem you to be earning your salary, NOT so much on where you physically receive your money. Complex!
And that also depends on whether or not your new employer in GVA is arranging "just" a Work Permit for you, or, perhaps eventually, a (limited) Residence Permit for you. It gets quite complicated, and also depends on which Kanton you are going to be based in (presumably GVA - although your new emplyer may well have their legal address elsewhere) - remember that Switzerland is a Federal nation, which means that in a number of respects it operates like the USA: i.e. various "rules & regs" - and laws! - do vary from State to State.
You should start off by looking at
www.taxation.ch (in English) which will give you a broad over-view of the principles of taxation in Switzerland, plus some links to go a bit deeper.
BUT, IMHO you should NOT rely on blokes like me (or anyone else on this forum; or any other mates you may have). Taxation everywhere is very complex and just because something works for "Mr. A" on this forum doesn't mean the same would apply to you - i.e. it all comes down to an individual's personal circumstances and these of course do vary considerably with each individual.
In short you need professional advice to fit YOU. It will cost you a few bob but could save you plenty more than that. PLEASE find a knowledgeable Accountant/Taxation Law specialist practice in your own country, or ask your new employer to put you in touch with one in Switzerland.
I make that plea for you to get PROFESSIONAL advice NOT as an Accountant, etc, myself, but as a simple engineer resident in Switzerland for almost 20 years now (now permanent, and a citizen with my own company registered here, but I didn't start off with that status!); and who, over the previous 20 odd years has also been "resident" (for tax purposes) in the UK, Germany, Norway, and Asia, etc. I learnt from past experience that you DO need personal professional advice for such stuff.
Good luck, and enjoy GVA - you will.
AES