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) to just anyone! It is confidential.
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?