Key legal question
Whether contributions fixed only provisionally as instalments can be reduced under Art. 11 AHVG.
Extracted holding
Yes. Art. 11 AHVG applies to enforceable contribution obligations even if they were fixed on a provisional basis; there is no requirement that the contributions be definitively calculated.
Extracted reasoning
The statutory text contains no limitation to definitive assessments. What matters is the existence of an obligation to pay contributions. Provisional akonto contributions ordered by the competent compensation fund are enforceable contribution obligations and may therefore be reduced if the statutory conditions are met.