Concessional CGST on used motor vehicles: central tax applies only to the supplier's margin where no input tax credit is claimed. Concessional central tax applies to specified old and used motor vehicles by taxing only the supplier's margin. Where depreciation was claimed, margin equals consideration received less depreciated value on the date of supply; otherwise margin equals selling price less purchase price, with negative margins ignored. The concession does not apply if the supplier has availed input tax credit, CENVAT, VAT credit or other tax credits on the goods.