There is a difference between a partner with whom you are married/have a civil partnership and a partner with whom you are cohabiting.
If you are married and you live in the Netherlands, you don't need to take any action, as your partner will be registered automatically.
If you live outside the Netherlands and do you have a new partner, make sure to let us know! Either send us an e-mail or send a letter to:
P.O. Box 4804
6401 JL Heerlen
Don't forget to include a copy of your marriage certificate (in either English or Dutch). It is important that both your and your partner's address details are the same. You must also inform the RNI.
Are you cohabiting? If so, your partner will only receive the surviving dependants' pension once he/she is registered with ABP. For this purpose, you will require a cohabitation contract. Read the conditions before registering your partner.