States can only opt for another structure, but experts say that might not be sustainable, once the Constitution amendment Bill becomes a law States opposing the goods and services tax (GST), such as Tamil Nadu, would not be able to avoid the indirect tax regime after the Constitution amendment Bill becomes law. The states would, however, be able to adopt a GST structure than is different from the one recommended by the proposed GST Council. The recommendations of the council would not be binding on the states. It should be noted that GST is targeted to be rolled out from April one, 2017 and for the purpose the Centre would have to pass the Central GST and Integrated GST Bills and the states their respective pieces of GST legislation. "The Constitution applies to the entire country, so each state has to impose GST once the new tax system is introduced," constitutional expert Subhash Kashyap said. There could only be GST on sale of goods and services from the date the