Recognition of penalty interest and prepayment penalties at the tax office
I have the following situation:
In 2001, my father purchased an apartment (Apt.1) without taking out a loan. Initially, this apartment was used as a condominium. In 2007, this apartment was mortgaged to purchase another apartment (Apt.2), a loan was taken out. The plan was to rent out Apt. 2. Due to the progressing cancer diagnosis and the more favorable location of Apt. 2 (opposite the hospital), Apt. 1 was ultimately rented out, while Apt. 2 was used as a condominium. In essence, a loan was indirectly taken out for the rental of an apartment, but only indirectly. The value of the apartments is roughly identical, meaning that the rent received for Apt. 1 corresponds to the theoretically achievable rent for Apt. 2.
In 2011, my father passed away, and my sister and I inherited Apt. 1+2, with a usufruct on Apt. 2. Apt. 1 continues to be rented out. The existing loan agreement was terminated by us with payment of prepayment penalties, and a new loan was taken out.
The tax office now refuses to recognize our father's interest payments and ours, as they cannot see a connection between the loan taken out and the rental. This probably also applies to the prepayment penalties.
In reality, we did repay the old loan before maturity and took out a new one in order to continue renting out the property (rental income now roughly matches the loan repayment installment).
We are aware that interest payments can only be deducted as advertising costs if they are related to income generation (§ 9 EStG).
Are there any convincing wording suggestions for our case that we can submit to the tax office (firstly: regarding the father's move into the originally intended for rental apartment; secondly: our new loan/payment of prepayment penalties was only done to maintain the rental)? Thank you very much in advance!