Kernrechtsfrage
Whether a 10% home-office deduction for accessory activities was deductible.
Extrahierter Entscheid
The deduction was properly refused because the activities were mainly directorships near the taxpayer's home, the need for a home office was not proved, and the occasional lecturing activity was not principal and regular.
Extrahierte Begründung
The taxpayer bore the burden of proving the factual prerequisites for a higher professional expense deduction and failed to show that the companies could not provide a workspace or that the conditions for private-room deduction were met.