Your Social Insurance Number (SIN)

What is a Social Insurance Number (SIN)? Do I need one?
The Social Insurance Number (SIN) is a unique number that you use to identify yourself. It is a 9-digit number. You need this number to use some government programs. You need this number to work in Canada.
How do I get a Social Insurance Number (SIN)?
To get a Social Insurance Number (SIN), you have to fill out an application. You also need to collect some documents to submit with your application.
What documents do I need to apply for a Social Insurance Number (SIN)?
When you apply for a SIN you need to show certain documents. The documents you need depend on your status in Canada.

Who do I need to give my Social Insurance Number (SIN) to?
Do not give your Social Insurance Number (SIN) number out to just anyone! It is a confidential number.
What if my Social Insurance Number (SIN) starts with 9?
If you need a SIN for work but you are not a Canadian citizen or permanent resident, you may be able to get one. Your SIN will start with the number 9. It has an expiry date.
What do I do if my SIN is lost or stolen?
Report a lost or stolen SIN to your local Service Canada Centre as soon as possible.

What is a Social Insurance Number (SIN)? Do I need one?