Question juridique clé
Whether underpriced rental to a close relative is treated like self-use for income tax purposes
Solution extraite
Yes. Under § 23(1) Ziff. 2 StG/TG, underpriced rental to a related person is equated with self-use, so the difference to the eigenmietwert may be taxed.
Motifs extraits
The cantonal legislature created a sufficient basis to prevent avoidance through preferential family rent; the provision fits within the harmonization framework and the canton’s leeway.