Just for your information: we ultimately solved it by repaying the bank loan over 15 years every month (1,000 euros) and taking the KfW loan fixed for 10 years with interest-only payments. If there is any money left over at the end of the month or year, we make special repayments to the bank/KfW. This way we are as flexible as possible and the fixed monthly burden remains manageable if a salary is lost. Thanks for your suggestions!
As I understand it, he pays the 1,000 euros for the bank loan and only the interest for the KfW (i.e. deferral of principal repayment). However, after 10 years he must repay the entire KfW amount in one lump sum. Therefore, you should at least put the available money into the KfW loan as a special repayment, at least in part. Because: Unless interest rates develop positively for you after 10 years (i.e. decrease or stay the same), you will continue to pay the monthly rate of 1,000 euros for the bank loan. But if you already put all your money into special repayments for the bank loan – how do you intend to pay the due KfW amount in 10 years?
Off topic: Those who are currently refinancing will probably stone me for this statement: Calling a 15-year financing with an interest rate of 1.98% expensive – this only makes me shake my head. :rolleyes: