Questione giuridica chiave
Whether default interest on retroactive AHV contribution claims is owed even if the compensation fund caused the delay and the claimant seeks reimbursement of paid interest.
Decisione estratta
Yes. Under the applicable social insurance rules, default interest is owed on late-assessed contribution arrears even where the administration contributed to the delay; the claimed reimbursement is therefore unfounded.
Motivazione estratta
Art. 26 ATSG and Art. 41bis AHVV provide for a standardized interest adjustment to balance possible interest gains and losses. Administrative fault does not eliminate the statutory interest duty, and the appellant's reliance on a duty to mitigate loss changes nothing.