The tax rate on used old car transactions has been reduced to 18 percent for large cars and SUVs, and 12 percent for small vehicles, from 28 percent (for both categories) earlier. The new rates have come into effect from January 25, 2018. Government has issued Notification No. 8/2018 Central Tax Rate read with State Tax Rate Notification & Notification No. 1/2018 Compensation Cess Ratereduced the Rate of GST & exempted the Cess on old and used vehicle.