State tax exemption on used vehicle margins applies with capped rates per vehicle category, excluding suppliers who claimed input tax credit. State GST exemption is allowed on intra-state supplies of specified old and used motor vehicles by capping tax to an amount calculated on the supplier's margin at prescribed rates per vehicle category; margin is computed as consideration less depreciated value if depreciation was claimed, or as selling price less purchase price otherwise, with negative margins ignored. The vehicle specifications follow the Motor Vehicles Act and the exemption is not available where the supplier has availed input tax credit, CENVAT, VAT input credit or similar tax credits.