Canadian SIN Validator

What is a SIN?

A Social Insurance Number (SIN) is a 9-digit number issued by Service Canada. It's used to access government programs and is required for employment and tax purposes in Canada.

SIN Number Format

• 9 digits total - Usually formatted as XXX-XXX-XXX
• First digit meaning:
  • 1-7: Regular SIN (Canadian citizens and permanent residents)
  • 9: Temporary SIN (temporary residents, work permit holders)
• Validation: Uses the Luhn algorithm (same as credit cards)
• Check digit: The last digit is calculated to make the entire number valid

How the Luhn Algorithm Works

The Luhn algorithm validates SINs through these steps:

1. Starting from the right, double every second digit
2. If doubling results in a two-digit number, add those digits together
3. Sum all the digits
4. If the total is divisible by 10, the SIN is valid

Example: SIN 046-454-286

• Digits: 0-4-6-4-5-4-2-8-6
• Double every 2nd: 0-(8)-6-(8)-5-(8)-2-(16)-6
• Sum digits: 0+8+6+8+5+8+2+1+6+6 = 50
• 50 ÷ 10 = 5 (valid!)

Temporary SINs (Starting with 9)

• Issued to temporary residents (work permit, study permit holders)
• Has an expiry date linked to the work/study permit
• Must be renewed when permit is extended
• Starts with the digit 9
• Employers must verify the expiry date

Protecting Your SIN

• Never carry your SIN card in your wallet
• Only provide your SIN when legally required (employment, taxes, banking)
• Beware of SIN-related scams - Service Canada never calls to ask for your SIN
• Report lost or stolen SINs to Service Canada immediately
• Check your credit report regularly for unauthorized use

Official Resources

• Service Canada - Social Insurance Number
• Protecting Your SIN
• How to Apply for a SIN