Financing comparison - should one avoid a building savings financing?

The loan amount is naturally the same in all offers, so it can be left out in the comparison, right?

You wouldn't believe how many offers have already existed here where the loan amounts were different. Just based on feeling, the difference between the building savings variant and the annuity variant is much too large in your case compared to the previous comparisons we had here in the forum. It was usually relatively close.

Either it’s due to the extreme interest rates after the fixed interest period that you assume or there is still a calculation error included.

By the way, one should of course not compare apples with oranges when it comes to loan installments. For example, Bank 1 cannot capitalize on the interest advantage compared to Bank 2’s offers because the repayment rates, but not the annuities, are the same.

Roughly speaking, the rate should also have been adjusted again after the fixed interest period in the case of annuity loans, otherwise the terms do not match. Due to lack of data, I did not even try to verify this for mBausparer.

Is the assumption of 5% interest in 20 years really so extremely unrealistic? Of course, no one can look into a crystal ball, but what would you use to continue calculating? What data is still missing to be able to assess the [Bausparer]?

The follow-up interest rate must be determined individually. If I knew what was coming, I'd probably be a rich man. Personally, I only find the 7% after 10 years with KFW to be absurd, but that really only concerns the differences between the two building loan variants with 10 and 20 years. I dare not judge whether the 5% after 15 or 20 years is absurd or not. However, I also assume an inflation rate of 2.5-3% with 5%. And this is actually what a borrower wishes for, because the installment thus becomes "cheaper" over time. Now it depends on each individual's spending behavior. Do you take what is left over and put it into special repayments, or do you prefer to consume other things. Personally, I was faced 4 years ago with the choice of 10/15 or 20 years fixed interest. I then chose the golden middle way with 15 years. No matter how the interest rate would have developed after 15 years, the remaining debt would have been such that the installment was still affordable. Due to several salary increases, we were able to make relatively large special repayments in the first 4 years, and if that continues, I will be finished after 15 years. So I would have paid the interest surcharge for 20 years fixed interest in vain. In the decision, one might also want to consider how likely special repayments are. I entered my financing variants into Excel and then simply played through different scenarios with special repayments and follow-up interest rate.

We do not want to include special repayments in the calculation. We are planning to have children and would like to consider special repayments as a nice to have. Therefore, I see it as very unlikely that we will be finished 15 years earlier and would tend to go for the [Bausparer].

Is the assumption of 5% interest in 20 years really that extremely unreasonable? Sure, no one can look into a crystal ball, but what rate would you use to continue calculating?

My bank calculates with 8%.

Otherwise, I think there's at least one mistake in it.

I have read here more often that a building savings financing is discouraged. We had a building saver and classic annuity loans offered. To compare these, I created the following overview.

Can you also put that into Excel? What is now the relevant decision criterion for you? How did you calculate the effective interest rate? The challenge with building savings loan combinations with annuity loans is precisely the determination of the effective interest rate (or internal rate of return). Under the same conditions (fixed interest period, term, loan amount), one naturally chooses the offer with the lowest effective interest rate. And in general, you only sign contracts that you have understood*. *Except with software :P