When we talk about fixed interest rates, we're talking more specifically about the debit interest rate. This is the period of time for which a certain interest rate is guaranteed to remain the same. Interest rate changes don’t affect your interest rate during this period, i.e. it cannot be increased or decreased.
How long the period should be, depends on interest rate trends and your risk tolerance. Usually, it is said: If the interest rate is high right now, sometimes it makes more sense to choose a shorter period. If the interest rate is just low, you can also choose a longer period.
However, if the period is very long, the interest surcharge at the bank will also be higher. We would recommend that you seek advice on this decision before you make up your mind. Our experts will be happy to help you.
By the way: Fixed interest rates are not the same as fixed terms.