Questão jurídica principal
Whether Solothurn's tariff rule for single parents living with another adult violates Art. 11(1) StHG
Decisão extraída
Yes. The federal tariff reduction for single parents applies even if another adult lives in the same household; the cantonal requirement of living 'alone' is incompatible with Art. 11(1) sentence 2 StHG.
Fundamentação extraída
The wording of Art. 11(1) sentence 2 StHG is clear and includes unmarried taxpayers with children living with them and mainly supported by them. Cohabitation with another adult does not exclude the tariff reduction. The canton therefore could not deny the married tariff solely because the taxpayer lived with his partner.