Questão jurídica principal
Whether the company could challenge the definitive debt stay by denying receipt of the tax assessment notice.
Decisão extraída
The tax assessment was deemed validly notified on the basis of the surrounding circumstances, so the reminder could serve as an enforceable title for definitive stay.
Fundamentação extraída
The company did not object after receiving the payment reminder and only raised non-notification months later; such silence made its denial implausible. The Federal Court was bound by the cantonal findings.