Question juridique clé
Whether the complaint was admissible, including challenge to the final Zug assessment in an intercantonal tax conflict.
Solution extraite
The complaint was admissible, and the already final Zug assessment could also be challenged in this intercantonal conflict.
Motifs extraits
In intercantonal allocation disputes, a final assessment of another canton may be attacked together with the challenged decision, even though it is not itself a judgment under the BGG.