Your Social Insurance Number (SIN) is a nine-digit number issued by the Government of Canada. It is required to work in Canada, file your taxes, and access government programs like Employment Insurance and the Canada Pension Plan. Every newcomer who is authorized to work in Canada should apply for a SIN as soon as possible after arriving.
Who Needs a SIN in Canada?
You must have a SIN to legally work in Canada and to receive government benefits. The following people are eligible to apply:
- Canadian citizens (born in Canada or naturalized)
- Permanent residents
- Temporary residents authorized to work in Canada (with a valid work permit)
- International students authorized to work on or off campus
- Refugees and protected persons
Visitor visa holders and tourists are generally not eligible for a SIN unless they also hold a work or study authorization.
Types of SIN Numbers in Canada
Not all SIN numbers are the same. The first digit indicates the holder's status:
- Starts with 1–8: Permanent residents and citizens — no expiry on the SIN
- Starts with 9: Temporary residents (work/study permit holders) — SIN expires when your immigration document expires
Important: Temporary SIN Renewal
If your SIN starts with 9, it is tied to your immigration document's expiry date. When you renew your work or study permit, you must also update your SIN at Service Canada with the new permit. Failure to do so can cause payroll and tax filing problems.
Documents Required to Apply for a SIN
Permanent Residents
- Confirmation of Permanent Residence (COPR) — issued at the port of entry, OR
- Permanent Resident Card
- Passport (to verify identity)
Temporary Workers
- Valid work permit
- Passport
- Letter of employment (may be required if SIN is needed before work permit arrives)
International Students
- Valid study permit that includes authorization to work
- Passport
- Proof of enrollment from your post-secondary institution (if permit does not include work authorization on the face of the document)
How to Apply for a SIN — In-Person at Service Canada
In-person application is the most common method and the fastest way to get your SIN. Here is the step-by-step process:
- Find your nearest Service Canada office using the Government of Canada's online locator
- Arrive with original documents (photocopies are not accepted)
- Complete the SIN application form (available at the office or printable online at canada.ca)
- Submit your application to a Service Canada agent
- Receive your SIN the same day — no card is issued anymore; you receive a confirmation letter
Processing time in-person: same day, usually within 30–60 minutes.
How to Apply for a SIN Online
Since 2020, Service Canada offers an online SIN application for eligible newcomers. You can apply online if:
- Your immigration document has a machine-readable zone (MRZ) — the two rows of characters at the bottom of the document
- Your immigration document is a permanent resident card, work permit, or study permit issued by IRCC
Online application steps:
- Go to canada.ca/social-insurance-number
- Click "Apply online"
- Enter your personal information and immigration document details
- Upload a scan or photo of your documents
- Submit the application
- Receive your SIN by mail within 10 business days
Online processing time: 10 business days. If you need to work immediately, apply in person.
How to Apply by Mail
You can also apply by mail, but this is the slowest option (3–4 weeks). Mail applications require notarized copies of your documents. This method is rarely recommended unless you cannot access a Service Canada office or use the online portal.
Protecting Your SIN
Your SIN is one of the most sensitive pieces of personal information you hold. Identity theft using a SIN can have serious financial and legal consequences. Follow these rules:
- Never carry your SIN confirmation letter in your wallet
- Only provide your SIN when legally required (employer, CRA, financial institution)
- Landlords, gyms, and stores do not need your SIN — you can refuse to provide it
- Do not share your SIN by email or text message
- If you believe your SIN has been compromised, contact Service Canada immediately
What Your SIN Is Used For
- Employment: Every employer requires your SIN for payroll and T4 slips
- Tax filing: Your CRA account and all tax returns are linked to your SIN
- Banking: Banks report interest income to CRA using your SIN
- Government benefits: EI, CPP, OAS, GST/HST Credit all require a SIN
- RRSP and TFSA: Registered accounts are tracked by SIN with CRA
SIN vs. Business Number (BN)
If you start a self-employed business in Canada, you may also need a Business Number (BN) from the CRA. This is separate from your SIN and is used for GST/HST registration, payroll accounts, and corporate income tax. You do not automatically get a BN when you get a SIN.
After Getting Your SIN
Once you have your SIN, take these steps immediately:
- Open a bank account — provide your SIN to the bank for tax reporting
- Give your SIN to your employer before your first paycheque
- Register for My CRA Account at canada.ca to track your tax filings and benefits
- Apply for a TFSA and start building savings
- Apply for a secured credit card to start building your Canadian credit history