Field help: (2018) Income from building owner / purchaser communities This text refers to the Steuererklärung 2018. You can find the version for the Steuererklärung 2025 at: (2025): Income from building owner / purchaser communities Tick this box if you had income from communities of builders or purchasers (Bauherren-/Erwerbergemeinschaften) in 2018.