I regularly receive a conditions newsletter from an independent financial advisor, which also mentions forward conditions. It currently includes surcharges of 0.0% for 12 months, 0.35% for 24 months, 0.5% for 36 months, and 0.9% for 48 months. So it reads as if 12 months is no problem, which is not surprising either, since 12 months of interest-free period are common for new contracts, and a follow-up financing is usually not concluded just one week before the deadline. After that, especially higher than 24 months, it gets expensive. Of course, I don’t know to what extent these numbers are representative. My personal opinion is that there is currently no need to worry. Speculation points to a rate hike by the USA in December, but you can’t rely much on that, and until the ECB follows suit… the ECB’s programs are currently running until sometime in 2018. Therefore, I wouldn’t currently consider forward for 5 years. But that is just my crystal ball.