Social Insurance Number (SIN)

A Social Insurance Number (SIN) is a unique nine‑digit number issued by the Government of Canada that you need to:

  • work in Canada or be self‑employed
  • file income tax returns
  • receive federal benefits and programs such as Employment Insurance (EI) and Canada Pension Plan (CPP) or Quebec Pension Plan (QPP)

The SIN is not a piece of identity documentation with security features like a photo — it is a government file number for tax, benefits and employment purposes.

📌 Who Needs a SIN

You need a SIN if you are:

  • a Canadian citizen
  • a permanent resident of Canada
  • a temporary resident authorized to work in Canada (your SIN begins with “9” and has an expiry date)

You should apply for a SIN within three days after you begin employment in Canada if you do not already have one. Children aged 12 or older can also apply on their own; parents or legal guardians can apply for children under the age of majority.

📥 Apply, Update or Receive a SIN Confirmation

You can apply for a new SIN or update an existing SIN record :

  • to get a first‑time SIN
  • to obtain a SIN confirmation letter
  • to update your SIN after a name change, status change, or change in immigration documents
  • to correct an error on the SIN record

There is no fee to apply. You can submit your application online, by mail, or in person at a Service Canada office.

📑 Documents You Need

If applying by mail or in person, you must submit original documents proving your identity and legal status in Canada. Digital copies may be accepted for online applications, but they must be clear and complete.

👔 Employers and SINs

Employers in Canada must collect the SIN of employees for payroll and tax reporting purposes. They should request the SIN no later than three days after employment starts. If a new employee does not already have a SIN, they must be informed to apply as soon as possible.

🔐 Protecting Your SIN

Your SIN is sensitive personal information. Only provide it when legally required (e.g., to an employer, government programs, financial institutions reporting income). Sharing your SIN unnecessarily increases the risk of identity theft and fraud.

📍 How to Access Your SIN

Once your SIN is issued and processed, you can view and print it securely via your My Service Canada Account (MSCA). If you opted for digital delivery during application, you may not receive a paper confirmation letter by mail.

📌 Important Notes

  • Your SIN is linked to your lifetime records — if you change your immigration status or legal name, update your SIN record.
  • SIN numbers that begin with “9” are temporary; they expire with your work permit and must be updated when your status changes.
  • A SIN card is no longer issued — you receive a confirmation letter instead.

🔗 Related Resources