How secure is the collateralization of the remaining debt via a home savings contract?

well, the cancellation period probably hasn't expired yet, so it wouldn't be a problem

but 4% over 15 years? probably around 100% financing, because if you contributed more equity, it should be below 4%...

well, the withdrawal period probably hasn't expired yet, so it wouldn't be a problem

but 4% over 15 years? probably around 100% financing, because if you brought in more equity, it should be below 4%...

Yes 100%

We requested the Bvs on Monday

So, I have calculated scenarios myself extensively.
True, with a building savings contract it becomes more expensive. Still, I couldn’t fully understand some of the numbers mentioned here 100%. Therefore, I ask you to correct me if necessary!

Procedure:
First, with a repayment calculator, 379k at 4.03% nominal interest over 15 years was calculated, resulting in

- 371k total, of which 177k interest
- plus 3k fee + 73.5k savings contribution in the [Bausparvertrag] as well as
- 110.5k building savings loan at 1.15% with unchanged rate of 2063€ results in
- 3k additional interest

371.0k
3.0k
73.5k
110.5k
3.0k
_______
561.0k with building savings contract

Annuity with special repayment:
Here I had to make assumptions. Instead of an annual special repayment, I increased the monthly rate so that after 15 years the 73.5k would accumulate, i.e. by 409€. Otherwise it was hardly possible to enter this into the calculator.

- 445k total, of which 149k interest
- 83.5k remaining at (fictitious) 5% with unchanged rate of 2063€ results in
- 8k interest

445.0k
83.5k
8.0k
_______
536.5k annuity + special repayment

According to my calculation, insurance against interest rate changes through the [Bausparvertrag] is roughly 25k more expensive over the entire term, with a few assumptions for the calculation, of course.
And is right: it comes out somewhere around 15% follow-up interest.

Therefore, it doesn’t really make much sense. :-/

You have to take out the building savings contract for a certain amount, here 190k€, pay fees for it and pay the agreed savings contributions. Meanwhile, the building societies cancel if too little is paid or do not accept more money. The allocation is not guaranteed on a certain date and can be delayed by a few months. If it is not ready for allocation, you can reduce or split it, which again costs fees and is subject to the prevailing conditions at that time. You will probably only get the 1.15% loan interest rate with a very high repayment (within 7 years?). With a 4% loan interest rate (which I consider significantly too high), only special repayments actually make sense. You can run a smaller building savings contract (max 50k€) alongside. If you want interest rate security, fix it for 20 years; that should also be possible with 4%.

Annuity with special repayment: Here I had to make assumptions. Instead of an annual special repayment, I increased the monthly rate so that after 15 years the 73.5k would accumulate, so by 409€. Otherwise, it was hardly possible to enter it into the calculator.

A little tip, there are great calculators on the internet for _INTEREST_ - _CALCULATION_, where you can calculate mortgage progressions very precisely and also enter annual special repayments and one-time special repayments. I am not allowed to link you here, but with the above terms and Google you should find the site. :)

A little tip, there are great calculators on the internet for _CALCULATING_ _INTEREST_, where you can calculate mortgage progressions very precisely and also enter annual special repayments and one-time special repayments.
I'm not allowed to link you here, but with the terms above and Google, you should find the site. :)

The numbers don't change that much. But thanks.

Regarding the 4.03% it should be said:

Have received offers from two advisors in the same range. If that is way too high, then where is the "right" interest rate?