Kernrechtsfrage
Whether the CHF 50 reminder fee under Art. 34a AHVV was lawful despite the appellant's cash payment offer.
Extrahierter Entscheid
The fee was unlawful because the appellant was entitled to pay in cash and the fund entered into default by refusing proper payment.
Extrahierte Begründung
The AHVV regulates deadlines and timing but not payment form. In the absence of a special rule, cash payment is permitted under the currency rules and by analogy to Art. 84 OR. The creditor may authorize cashless payment by naming an account, but this does not create an obligation. By refusing the cash offer, the fund was in acceptance default under Art. 91 OR and could not validly charge a reminder fee.