Key legal question
Whether the employer must pay the outstanding BVG contributions, contractual reminder fee, and default interest.
Extracted holding
Yes, the employer owes the unpaid contributions, the reminder fee, and default interest at 5% as claimed.
Extracted reasoning
The attachment agreement and Art. 66 BVG obliged the employer to pay contributions. The invoices substantiated the arrears, the contract provided for a reminder fee and default interest, and the claimed interest starting dates followed the payment deadlines.