Tax exemption on intra state resale margin of specified used motor vehicles reduces tax rate, subject to input tax credit exclusion. Exempts specified old and used motor vehicles from State GST on intra state supplies to the extent tax exceeds the amount calculated on the supplier's margin at the prescribed rates for each vehicle category; vehicle categories are determined per the Motor Vehicles Act. Margin is measured as consideration less depreciated value for depreciated assets, or selling price less purchase price otherwise, with negative margins ignored. Exemption does not apply if the supplier has availed input tax credit, CENVAT or VAT input credit on those goods. Notification effective from 25 January 2018.