In fact, in Canada you only have to give out your SIN when it is required by law, and you should never give it out otherwise: https://www.canada.ca/en/employmen

In fact, in Canada you only have to give out your SIN when it is required by law, and you should never give it out otherwise: https://www.canada.ca/en/employment-social-development/services/sin/reports/code-of-practice/section-2.html https://www.canada.ca/en/employment-social-development/servi... Unfortunately, one of those lawful uses is to give one's SIN to banks who provide accounts that pay interest. That said, I don't think it's enough to impersonate someone.