Finance Minister Arun Jaitley an**unced that India's biggest tax reform in decades, the national Goods and Services Tax or GST, will be launched at Midnight on June 30. Mr Jaitley said President Pranab Mukherjee , Prime Minister Narendra Modi and two of his predecessors will be on stage in the central hall of Parliament for the launch. PM Modi will deliver a speech at the Special gathering of parliamentarians.