Key legal question
Whether income from participation in German GmbH & Co. KG shipping companies is AHV-liable income from self-employment under Art. 20(3) AHVV.
Extracted holding
Yes. As a member of an acquiring-purpose partnership without legal personality, the respondent's share of income is treated as income from self-employed activity, regardless of personal work contribution.
Extracted reasoning
Art. 20(3) AHVV covers not only Swiss partnerships but also other person associations without legal personality aimed at gain. The provision is lawful, its history confirms a general contribution duty for limited partners, and the respondent's role as a passive investor does not exclude self-employment treatment.