Follow-up financing with a building savings plan?

Hello forum,

I have been living in my own home for a few months now and am diligently paying off my loan (monthly €930.00). My loan has a fixed interest period of 15 years. So the fixed interest period ends in 2017. The remaining debt will then be approximately €120,000.

I am now wondering if it makes sense to simultaneously save monthly into a [Bausparer]. This would result in a savings amount of €150.00 * 180 months = €27,000 in [Bausparguthaben].
With 40% savings, I would have a [Bausparer] of €67,500, with which I would like to partially repay the remaining loan.

Is this sensible? That way I can at least secure the low interest rates on the €67,500?

Or is it better to set aside the €150 for special repayments?

I don't think that after 15 years, even with interest rate increases to 6-7%, the financing will falter. Sure, it would be tight, but not impossible.

How do you do it? Do you secure low interest rates for the end of the fixed interest period?

Thanks for the advice

Regards
Koala

Why not repay €150 more monthly? How would the outstanding balance develop then?

I recently had a small salary increase and did not include it in the installments because the additional income was not yet certain at that time.

I played around with a few virtual values
Current loan interest rate 3%
Special repayment 150€/month
results in a repayment of approx. additional repayment of 34,000 €

After that, I calculated an annuity loan of 120,000€ minus the 34,000€ through additional special repayment
assumed repayment 1,000€

I compared this with the building savings variant.

Starting from a building savings sum of 67,500 minus 27,000 credit = 40,500 building savings loan
assumed interest rate 3%
assumed repayment 390€/month
finished after approx. 120 months

an annuity loan of (120,000 minus 67,500€) = 52,500€

Result:
With an interest rate development to 7%, all 3 loans are repaid in 120 months.
Under 7%, the special repayment is more sensible.
Over 7%, the building savings variant.

Now that I have fed my crystal ball with your values, I hand over the crystal ball for the interest rate development to you

I hope the text can be understood. Sometimes you should read through your texts once more before sending them.

@ Admin
Is there going to be an edit function at some point?

Ok, thank you very much. As I see it, there is no right or wrong now. It will only become clear in 15 years what would have been more sensible. I will now put the 150 € monthly into a [Tagesgeldkonto] and make special repayments. This way I also save the [Abschlussgebühren] of the [Bausparer].