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When should I give my Social Insurance Number to a Credit Card Company (or anyone else for that matter)?

Personal Finance & Money Asked on July 15, 2021

When applying for an American Express card, it asks me for my social insurance number (SIN) but it is optional. Should I give it? The site states

We encourage providing your SIN for more accurate identification (e.g.
obtaining your credit bureau report).

As an aside, I remember when I got my SIN card I was told it is confidential and to keep it a secret. I can think of lots of things that ask for your SIN quickly, for example some job openings ask for it along with the pre-screening questions. What bad things can someone do with your SIN?

One Answer

According to the Canadian government SIN code of practice

Never give out your SIN unless you are sure it is legally required or you are satisfied it is necessary.

In the private sector, you must provide your SIN to your employer for income tax and benefit purposes. You must also give it to financial institutions for accounts that pay interest. Except when required for government programs and services, it is your decision when to share your SIN information and with whom.

If you are not satisfied that it is necessary (meaning you think it is not necessary or you are not sure) don't give it out.

I believe a company cannot require you to give a SIN in order to give you a service. The fact that Amex says it is optional suggests they know that.

Answered by DJClayworth on July 15, 2021

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