<ul><li><a href=http://www.cra-arc.gc.ca/bsnsss/menu-eng.html target=_blank>Canada Revenue Agency(Businesses)</a></li><li><a href=https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/gst-hst-businesses/register-a-gst-hst-account.html#register target=_blank>Government of Canada(Register for a GST/HST account)</a></li><li><a href=https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/registering-your-business/business-registration-online-overview.html target=_blank>Government of Canada, Business Registration Online(Business Registration Online – Overview (covering also online registration for corporation income tax, GST/HST, etc.))</a></li></ul>