Social Insurance Number – Overview
The Social Insurance Number (SIN) is a nine-digit number that you need to work in Canada or to have access to government programs and benefits.
A SIN is issued to one person only and it cannot legally be used by anyone else. You are responsible for protecting your SIN. Store any document containing your SIN and personal information in a safe place—do not keep your SIN with you.
Service Canada is now issuing SINs in paper format (confirmation of SIN letter). Production of the plastic SIN card has stopped, however, SIN cards that are not expired and are currently in circulation can still be used.
If you are a parent of a newborn, you can apply for your child’s SIN through the Newborn Registration Service.
If you are an employer, learn about your responsibilities related to your employees' SINs.
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