I bought a piece of land in 2023. I did not declare anything w.r.t that in my 2023 in my Tax declaration. Thus, Tax department in tax response letter - "Bescheid für 2023" - asked me the following:
Current status:Nach den vorliegenden Unterlagen haben Sie in 2023 ein unbebautes Grundstück erwroben .Bitte teilen Sie mir mit der Einkommensteuer 2024 mit wie das Grundstück in Zukunft genutzt wird.
Translated: "According to the documents available, you acquired an undeveloped plot of land in 2023. Please let me know how the property will be used in the future with the 2024 income tax"
In March 2024, I have signed a contract with a builder to build a KfW 40: Effizienzhaus with KfW 300 funding. At the end of CY 2024, I have paid 5% of the house price + Earth works (Erdarbeiten) and Foundational Concrete Plate (Bodenplatte) work has been completed. I expect the house to be completed in CY 2025.
Now, I'm seeking help from you, for the following (Thanks in advance

Questions
- In my 2024 tax declaration, to respond to the Tax officer's query - should I just write a: a) comment about the current status or b) declare "Anlage V - Sonstige" and declare no income from Undeveloped Land Property "unbebauten Grundstücken"
- During my research, I also noticed 10f EStG can be claimed by "Anlage FW (Förderung des Wohneigentums)", which describes about Tax relief for buildings owned / used for private purposes. Can someone explain how this works, if I could get tax relief for construction invoices - any other links to further information with an example would be helpful?