Social Insurance Number (SIN)

What is a SIN?

SIN stands for Social Insurance Number. It’s a 9-digit number that you need to work in Canada or to have access to certain enrolment and financial programs and benefits.

Don’t know your SIN?

You can request to apply for a SIN at any Service Canada Centre, it’s free!

The Government of Canada has instructions on how to apply.

How do I provide my SIN?

Log in to Mosaic > Update SIN tile or check your personal information to make sure yours is correct. If you are unable to update your SIN, please contact the registrar’s office through our chat.

Why do you need my SIN?

Tax Forms

The most important part of your tax forms is your SIN, needed by the Canada Revenue Agency (CRA). If you claim an education deduction and your T2202A doesn’t include your SIN, the CRA may deny your deduction.

  • T2202A Tuition and Enrolment Certificate
  • T4A Statement of Pension, Retirement, Annuity, and Other Income

Note: The address on your tax slips does not affect your filing or return.

Need more information on tax forms? Our detailed tax section can be accessed here.

Awards, Scholarships and Bursaries

McMaster is required to provide a T4A for any student who has been issued an award, scholarship or bursary.

Curious about Scholarships and Bursaries? Learn how they work.

Ontario Student Assistant Program (OSAP)

Your SIN is needed to process of OSAP applications and distribution of OSAP funding.

McMaster uses your SIN to identify your account when communicating with the National Student Loan Centre (NSLC).

Not sure about how OSAP works or if it applies to you? Go to our guide on OSAP.

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