Application for a Social Insurance Number - NAS2120
Purpose
If you are applying online or in-person at a Service Canada Centre, you do not need to complete this application form.
To apply for a first-time Social Insurance Number (SIN), to obtain a confirmation of your SIN, or to modify your SIN record, complete this application form:
Your application must be accompanied by original and valid identity documents. Service Canada is not responsible for documents lost in the mail. Refer to the Instruction Guide for more details.
Group
Social Insurance Number
Forms
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Important Information
For the form to work properly (including Digital signatures), you must first save it on your computer, and reopen it with Adobe Acrobat Reader to add information. Then resave once completed.
APPLICATION FOR A SOCIAL INSURANCE NUMBER - INFORMATION GUIDE FOR APPLICANTS
PDF: Download GC-NAS2120, 481 KB, printed on 8 pages (8.5x11)