Kernrechtsfrage
Whether the appellant's tax domicile for 2007 was in A. (Obwalden) or in B. (Zurich) for inter-cantonal tax purposes.
Extrahierter Entscheid
The appellant's center of life and tax domicile was in A.; Zurich had no tax domicile over him for 2007.
Extrahierte Begründung
The lower court misapplied the natural presumption favoring the weekly residence. The evidence of long-standing weekend residence in A., intensive club and social ties there, and the much larger accommodation in A. outweighed the weekday apartment and work location in B.