When is a forward mortgage worthwhile?
You will of course know whether forward financing has paid off only with the benefit of hindsight. It will have been a good deal if the effective interest rate including the forward surcharge was lower than the rate at the time the old mortgage matured.
Example: your fixed-rate mortgage of 600,000 francs expires in one year. You extend it by 10 years prior to maturity at an interest rate of 2.1 percent and a forward surcharge of 0.15 percent, giving an effective interest rate of 2.25 percent.
This deal will then have paid off only if the interest rate is higher than 2.25 percent at the time of maturity (scenario B).