Is the financing feasible?

I have just calculated it (assumed an effective interest rate of 2.5%)
Everything about the bank:
Loan €300,000
Eff. 2.5%
Repayment 2%
Costs €1,117
Outstanding balance after 15 years €192,500

Bank+KFW:
Bank:
Loan €250,000
Eff. 2.5%
Repayment 2%
Costs €931
Outstanding balance after 15 years €160,500

KfW (max. term 25 years, max. interest rate fixed for 10 years)
Loan €50,000
Eff. 1.36%
Repayment 3.53%
Costs €203
Outstanding balance after 10 years €33,200

Did I make a mistake anywhere?

I only come up with 31.xxx (also a little less for the other values each)

But even if you had to continue financing these after 10 years at 5% interest (still with 203€ monthly) you would have a remaining sum of 26,100

So 160+26=186 still less remaining sum (at 5%...) than if you start everything at 2.5%.

The question is rather how you are dealing with the [ZÄrR] of the remaining sums at all. So still having 190k€ unsecured open?

The plan was simply to reduce the remaining debt with special repayments in about 5 years when we have a child and possibly have completed family planning. What options would I have to "secure" the remaining debt?

- Longer terms
- Direct TA / home savings contract
- Current (10/15) annuity structure, but additionally conclude a home savings contract

I am not familiar with TA/building savings contracts, I would have to read up on it, but building savings contracts are usually discouraged because of the additional fees, etc. I should consult a financial advisor who can explain it all to me. Thanks to you

Nothing is for free

Oh, higher repayment is also an option

The question today is whether this absolute low interest rate level will continue for the next 10 or 15 years. One could hope. But no one knows; except that it’s actually not good for the economy and for all of us citizens.

There are also better and worse building savings contracts (fees are, for example, not the same for all; payout modalities vary a bit; it’s also important to pay attention to the effective annual interest rate).

We, for example, also have 50k KfW and after 10 years 30,000 remain. Fees in our case for a building savings contract 30,000 480€. For that a secured interest rate of 2.6% effective. We have to save 1200€ per year (40% of 30k) So part of our special repayment flows into that.

Right on time for maturity the building savings contract is allocable. Then I can decide whether to pay out the money, and then continue financing 30k-12k=16k at the bank (if, of course, the interest rate will be below 2.6%), or I use the building savings loan.

If I had put the special repayment into the loan, I would have saved 1780 EUR in interest over 10 years.

So in the worst case, this protection would cost me 480+1780 (if the building savings contract is not used).

One can also calculate from which interest rate one would basically make a profit.

But in any case, we slept well for 10 years.

That’s how it is with us thanks to TA/[Bausparvertrag], long-term modules (with 20 years and full repayment) and the above-mentioned KfW security for the complete financing for the next 29.6 years

If I want to make special repayments, then I just shorten the whole thing and enjoy it positively.