Key legal question
Is the taxpayer's request for a declaration of no tax domicile in Valais admissible on federal appeal?
Extracted holding
No. The declaration request was a new claim that replaced the subject matter of the prior proceedings and was therefore inadmissible.
Extracted reasoning
Under Art. 99 BGG new claims are barred. The taxpayer had only disputed the commuting deduction before the cantonal appeal body, so the later domicile declaration went beyond the prior dispute.