How Do I Find My CRA Account Number?
Your CRA account number is your SIN number. You can find your SIN number on the card issued by the CRA and other CRA correspondence documents such as your tax returns or notice of assessments.
For businesses, your CRA account number is your business number. You can find your CRA business number by logging into Business Registration Online (BRO), calling 1 (800) 959 – 5525 or by submitting a RC1 form.
Other CRA Account FAQs