Rebates That Are Separate from the Sales Transaction – Manufacturers' Rebates
Some manufacturers provide a rebate application form with the property they sell. When this is the case, the customer completes the rebate application and mails it directly to the manufacturer after purchasing an item from a retailer.
The payment of the rebate is considered a separate transaction because it concerns only the manufacturer and the customer.
As a retailer, you must collect the GST and QST on the full selling price of the item, without deducting the value of the manufacturer's rebate.