Question juridique clé
Whether the Federal Court should treat the filing as an inter-cantonal dispute rather than an individual complaint and whether it was timely.
Solution extraite
The matter was an inter-cantonal tax dispute under the Federal Constitution; no dismissal for lateness was available.
Motifs extraits
The petition was brought by the Thurgau government in the name of the canton, so the case concerned competing cantonal tax claims, not a private complaint by the R. family.