Questione giuridica chiave
Whether the federal appeal against intercantonal double taxation was admissible without a final cantonal decision.
Decisione estratta
The appeal was inadmissible because only assessment decisions were challenged and no final cantonal judicial decision existed.
Motivazione estratta
Under the BGG, a complaint in public law matters generally requires a final decision of the last cantonal instance; the former exception for intercantonal double taxation no longer exists. Since the taxpayers had not exhausted one canton's judicial path, the Federal Supreme Court could not enter into the case.