Finding your CRA GST number is not as difficult as it may seem. All registered suppliers in Canada are required to have a Goods and Services Tax (GST) number.
If you are a business owner in Canada, you can find your GST number on your business registration from the Canada Revenue Agency (CRA). It should be listed as a 9-digit number.
You can also find your GST number on your Notice of Assessment, which is sent to you after you register for an account with the CRA. This is the letter or statement that the CRA sends you when you file your taxes.
If you do not have a business, then you are not required to have a GST number.
Finally, if you still can’t find your GST number, you can contact the CRA directly. They should be able to provide you with the appropriate information.