Key legal question
Whether abolishing the special coefficient for travel-agency commissions violated the legality principle under the Geneva tax statute and Constitution.
Extracted holding
Yes. The regulatory change amounted to a new coefficient for commissions and required proof of a significant, durable change in the relevant economic factors, which was neither shown nor examined.
Extracted reasoning
Under Art. 307B LCP, a new coefficient may be assigned only if a substantial and lasting change in the determinants of the prior coefficient is established. The record showed no such justification; the later reintroduction of a special coefficient also undercut the respondent's position.