Social Insurance Number
Social Insurance Number (SIN)
A Social Insurance Number (SIN) is a 9-digit number you need to work in Canada, file taxes, and access government programs. It is free and issued by Service Canada. International students, work permit holders, and permanent residents all need a SIN.
Cost
Free
Validity
Lifetime (PR/citizen)
Processing
5–10 min at office
Issued By
Service Canada
How to Apply for a SIN
Ensure you have valid immigration status (study permit, work permit, or PR card)
Visit a Service Canada centre in person with original documents
Bring your primary identity document (work permit, study permit, or PR card)
Provide a secondary ID if required — passport or provincial ID
Complete the SIN application form at the counter (no appointment needed at most locations)
Receive your SIN confirmation letter immediately — no card is issued anymore
Use your SIN for employment, tax filing, and government benefits
Do not share your SIN unnecessarily. Only provide it to employers, banks, and government agencies when required. Keep your SIN confirmation letter in a safe place.