Three submission methods[1]
In person: show documents at Service Canada. Online: upload digital copies in the official service. By mail: send the signed form and original documents to the SIN office.
YOUR NEXT CHAPTER
The beginning
of what comes next.
Your life in Canada, with clarity and at your own pace.
Service Canada / SIN / NAS / Free preparation
Choose how you will apply.
A SIN is a personal nine-digit number. Applying to Service Canada is free. Prepare a first application as a permanent resident here.
Interactive prototype
WHO THIS GUIDE IS FOR
First SIN: an adult permanent resident applying for themselves in Canada. This edition does not cover representatives, children, temporary-SIN updates or applications from abroad.
Other situations
If you already have a SIN, do not apply as if it were your first. Status changes, temporary permits and applications for someone else need a different route.
The form is not always needed[2]
NAS2120 is used for mail applications. You do not need this form when applying for yourself online or in person. Its fields are explained here to help prepare your information.
My preparation checklist
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Sources for this step
References support what you read here. You do not need to open them to complete the preparation steps.
- Social Insurance Number: ApplyService Canada · Consulted 11 Nov 2026How would you like to apply? / Mail your SIN application
- Social Insurance Number Application · NAS2120Service Canada · Consulted 11 Nov 2026Purpose