Questão jurídica principal
Whether training costs for obtaining a flight instructor license are deductible under direct federal tax
Decisão extraída
No; the costs were non-deductible training expenses, not professional development expenses.
Fundamentação extraída
The Federal Supreme Court held that the cantonal court wrongly relied on unequal treatment in illegality; the AFC circular did not establish a constant unlawful practice, and the legality principle prevailed.