On the death of a loved one, you must return the deceased’s social insurance card to the nearest Service Canada centre, along with a photocopy of the death certificate or the declaration of death. This reduces the risk of identity theft, and can be done in person or by mail. The mailing address is:
How to find the nearest Service Canada centre.
Note
Before cancelling the card, be sure to note the deceased’s social insurance number: you may need it to fulfill certain obligations related to the death.