The Social Insurance Number (SIN) is a nine-digit number that you need to work in Canada or to have access to government programs and benefits.A SIN is issued to one person only and it cannot legally be used by anyone else. Store any document containing your SIN and personal information in a safe place—do not keep your SIN with you.When making a request, please refer to the name of this survey: Report a Problem or Mistake on This Page.
Each time you do not give it when you are supposed to, you may have to pay a $100 penalty. If your SIN is missing or is incorrect, inform the slip preparer.
You must also give it to us when you ask us for personal tax information.
If the name indicated on your primary document is different than the name you are currently using, you must also provide supporting documents.
If you are applying for someone else, you may need to provide additional documents.
For more information, or to get an application for a SIN, contact Service Canada.
Enter your SIN on the first line of the "Information about you" area of the "Step 1 - Identification and other information" section on page 1 of your tax return.
If you are in another situation that makes it difficult to apply in person, you should call 1-800-206-7218 (option 3) to see if you are eligible to apply by mail.
Many settlement agencies can help you apply for a SIN.
If you are a parent of a newborn, you can apply for your child's SIN through the Newborn Registration Service.
If you are an employer, learn about your responsibilities related to your employees' SINs.
Instructions for making a request are provided in the publication Info Source, copies of which are located in local Service Canada Centres.