Those are the main risks. Might be worth getting a fixed rate in Switzerland if you know you will be holding a good few years. That'll eleiminate one risk. (I'm assuming that you can get a fixed rate with a Swiss mortgages.)
Rental being in EU and mortgage payments being in CHF means you will still be open to fluctuations in exchange rates, but if fixed rate is better than you can get elsewhere then it'll probably be worth while. You can always put a little aside each month so that should the exchange deteriorate you will have a small pot of funds to dip into for the mortgage payments..
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