When you register your business, you need to get a business number. If you have a sole proprietorship business, you need to contact CRA in order to request for it. This number is a unique also 9-digit and represents your business. If you have it, you can register MY BUSINESS ACCOUNT. In addition, if you would like to have GST/HST, payroll & import/export number, you should have business number at first. Also, any contact with CRA related to your business account needs a business number. If you have any questions, we are here to assist you.