Exemption of state tax on intra state supplies of used motor vehicles by taxing only the supplier's margin at reduced rates. Exempts State tax on intra state supplies of specified old and used motor vehicles by taxing only the supplier's margin at prescribed reduced rates; margin for depreciated (tax claimed) goods equals sale consideration less depreciated value, otherwise equals selling price less purchase price, with negative margins ignored. The exemption does not apply where input tax credit, CENVAT or VAT credit has been availed. Vehicle classification follows Motor Vehicles Act specifications and the measure operates under section 11 of the Punjab GST Act with a stated effective date.