Swiss citizens living abroad have the possibility of joining the optional old-age and survivors insurance (OASI) and disability insurance (DI). Failure to pay one single year's contribution already leads, as a general rule, to a reduction of the pension. 


Whoever wishes to join the voluntary OASI insurance scheme should present his or her request to the Swiss compensation Office (SCO) in Geneva. This request must be sent in within one year of leaving the compulsory insurance scheme!