We are manufacturer of Welding Machinery. We received an order from COS, Western Railway, Mumbai in May 2017. The rate of CST chargeable was 6.05%. The material against this order is going to be supplied in July 2017. Now with the implementation of GST, the rate of tax is 18%.
Is there any provision in the GST Act regarding this matter, wherein the purchaser, that is, The Western Railway, has to automatically change the rate of tax in its order?
Please provide information. Thank you.