Question juridique clé
Whether a final positive tax assessment for 2004 barred later use of remaining loss carryforwards in 2005-2007.
Solution extraite
Yes. A non-zero final assessment necessarily implies that no further deductible loss carryforward remains; later periods cannot reopen that question.
Motifs extraits
The court held that loss carryforward must be claimed without delay. A positive and final assessment has period-overlapping res judicata effect regarding the existence of deductible losses, in the interest of legal certainty and good faith.