Your SIN is a confidential number that is restricted to income-related information. Organizations in and outside government ask for your SIN because it is a simple method of identification. Many use it as a client account number to save them from setting up their own numbering systems.
However, only a few federal government departments and programs have the authority to collect your SIN. The authority to collect and use the SIN is tied to a specific legislated purpose, not necessarily to a particular body. For example, an employer can collect an employee's SIN to provide them with Records of Employment and T-4 slips for income tax purposes, as can provincial or municipal agencies to report financial assistance payments for income tax purposes. Institutions from which you earn interest or income, such as banks, credit unions and trust companies, must also ask for your SIN.
f someone asks you for your SIN, ask if you are required by law to provide it. Ask why the person needs it, how it will be used and to whom it will be given. If it is not required by law and you are not satisfied with the explanation, tell the person you prefer not to use the SIN and offer other identification. If the organization refuses to give you the product or service unless you give your SIN, do not give your SIN. You can make a complaint to the Privacy Commissioner of Canada.



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