No. The accident insurance in addition is not mandatory. However, under the mandatory insurance schemes, salaries are only insured up to a certain level (currently CHF 148'000/year). These schemes do not cover all risks. In particular for salaries above this threshold, it is advisable to conclude such an accident insurance in addition. With regard to the payment of the premiums, the parties are free to decide whether the premiums for the accident insurance in addition shall be borne by the Employer and/or the Employee.