Why do I need to provide OneVest with my Social Insurance Number (SIN)? November 21, 2023 20:06 Updated Your Social Insurance Number (SIN) is required by the Canadian Revenue Agency (CRA) for tax reporting purposes. Related articles What information do I need to sign up? How old do I have to be to open a OneVest account? How do I make a withdrawal under the HBP? What ID can I use when creating my account? How does ID verification work?