Kernrechtsfrage
Whether the tax and penalty claims were time-barred because the opening notice of investigation was not proved to have been served
Extrahierter Entscheid
The opening notice was considered duly notified; prescription was interrupted.
Extrahierte Begründung
The notice had already been established in prior proceedings, and the taxpayer had not contested receipt then. The court could therefore refuse further proof without violating the right to be heard.