When a GST/HST registrant sells goods to you and transfers ownership, but not physical possession of the goods to you, the registrant does not charge GST/HST on the sale if the registrant keeps physical possession of the goods in order to do the following:
The registrant assumes potential liability for the goods when physical possession of the goods is transferred to another person. The registrant is relieved of this liability when the registrant receives a drop-shipment certificate from the third party at the time physical possession is transferred.