Lost or Forgotten SIN: How to Find Your Number
Service Canada won't issue a new SIN because you lost your card or letter. Find your number on a tax return, T4 slip, record of employment or RRSP receipt, or view and print it in My Service Canada Account. If you still can't find it, apply for a Confirmation of SIN.
Damaged SIN card
Plastic SIN cards are no longer issued. If your card is damaged but you know your number, you don't need to do anything.
Stolen SIN or fraud
A new SIN is issued only if there is clear evidence that your number was used fraudulently. Contact the SIN program and report the fraud.
Found someone else's SIN?
Return it to a Service Canada Centre, or mail it to Service Canada, Social Insurance Registration Office, PO Box 7000, Bathurst NB E2A 4T1.
Step by step
-
Check your documents.
Your SIN is on your income tax return, tax slips such as a T4, your record of employment, and RRSP contribution receipts.
-
View it online.
Sign in to My Service Canada Account to view and print your SIN. Your SIN must be valid; temporary residents with a SIN starting with 9 may need to extend it first.
-
Still can't find it? Apply for a Confirmation of SIN.
The process and documents are the same as a first-time SIN application. It confirms your existing number; no new number is issued.
Phone numbers
Social Insurance Number
1-866-274-6627Monday to Friday, 8:30 am to 4:30 pm local time
From outside Canada and the U.S.: 1-506-548-7961 (8:30 am to 7:30 pm Atlantic time)
TTY: 1-800-926-9105
Related
Frequently asked questions
Can I get a new SIN if I lost my card?
No. A new SIN is only issued if there is clear evidence of fraud. You can get a Confirmation of SIN letter instead.
Sources
North Help Desk is an independent guide, not a government website. Rules, amounts and phone hours can change; always confirm on the official page before you act. Spotted something out of date? Tell us.