The margin scheme allows a GST registered person to calculate and charge GST on the margin between the purchase and selling price of goods, rather than on the full selling value. To use the margin scheme, the person must be GST registered, the goods must be substantially the same as when purchased, and have been previously purchased from a non-GST dealer or using the margin scheme. No tax invoice is issued under this scheme and the person must meet record keeping requirements. The margin scheme can also be used for goods purchased before implementing GST that are sold afterwards.