Margin scheme in GST applies tax on the difference between sale and purchase price for second hand goods. GST on second hand goods may be paid on the margin (selling price minus purchase price) where no input tax credit was claimed; negative or zero margins attract no tax. The margin includes value added by repair or reconditioning. A deemed purchase reduction applies for repossessed goods to determine purchase value. Registered dealers who opt for margin taxation receive notification based exemption from central and corresponding state tax on acquisitions from unregistered suppliers, and must not claim input tax credit while the unregistered seller does not issue a taxable invoice.