When Do You Get A Sin Number

when do you get a sin number

Everything You Need to Know About Obtaining a SIN Number

One of the critical identifiers you'll need to live and work in Canada is a Social Insurance Number (SIN). Your SIN is a unique nine-digit number that the government uses to track your earnings and tax obligations. But when should you get a SIN? Let's explore the scenarios when you need to obtain this number.

1. When You Begin Working in Canada

The first and most common time you will need a SIN is when you start a job in Canada. By law, your employer must request your SIN within three days of your employment start date. This ensures that all your earnings are accurately recorded and any necessary taxes are deducted.

2. When Applying for Government Benefits

If you plan to apply for any Canadian government benefits or social services, these programs will typically require your SIN. Examples of these programs include Employment Insurance (EI), the Canada Pension Plan (CPP), and the Old Age Security (OAS) pension.

3. When Opening a Bank Account

Financial institutions in Canada may ask for your SIN when you open a bank account or invest in savings products. While it's not mandatory to provide your SIN for these services, it can simplify the process of reporting interest or investment income on your taxes.

Obtaining a SIN for the First Time

If you're obtaining a SIN for the first time, you need to apply through Service Canada. You can apply in person at a Service Canada Centre or through the mail. Different documents are required for citizens, permanent residents, and temporary residents, so it's essential to review the application requirements before you apply.

Reapplying for a Lost or Stolen SIN

If your SIN is lost or stolen, you don't automatically get a new number. Instead, you should reapply through Service Canada using the same application process as for a new SIN. It's also vital to report the loss or theft to the Canadian Anti-Fraud Centre and monitor your accounts for any signs of identity theft.

Applying for a SIN for a Child

Parents can apply for a SIN for their children as part of the Newborn Registration Service when they register the birth. A SIN is needed if parents intend to open a Registered Education Savings Plan (RESP) for their child or if the child will earn income that they need to report to the Canada Revenue Agency.

Does a SIN expire?

It's worth noting that a SIN doesn't 'expire' as such, but temporary residents with work or study permits will have a SIN that begins with '9' and includes an expiry date. This means that their SIN will stop being valid once their permit has expired, unless they obtain a new permit or achieve permanent resident status.

The process to obtain a SIN is straightforward, but it's essential to know when and why you will need this number. Whether you're about to start a job, planning to claim benefits, or opening a bank account, your SIN is a critical tool for living and working in Canada.


In conclusion, if you have any questions about applying for a SIN or dealing with a lost or stolen SIN, you can contact Service Canada for assistance, they offer comprehensive information and support to guide you through the process.