If you are unsure of your Social Insurance Number (SIN), you will need to contact the Canada Revenue Agency (CRA) and confirm it with them.
If you are in Canada or the United States, you can call the Canada Revenue Agency (CRA) at 1-800-959-8281. If you are elsewhere, you can call 613-940-8495. This page has more ways to contact the CRA: Contact the Canada Revenue Agency
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