Effective April 1, the GST exemption threshold has been raised from Rs 20 lakh to Rs 40 lakh. For hilly states and those in the North East, the threshold has been doubled to Rs 20 lakh.These states will now be able to choose if they want to keep the GST exemption limit at Rs 20 lakh or Rs 40 lakh, Jaitley said.'Rs 40 lakh will be the exemption limit for all states, and Rs 20 lakhs for NE and hill states with a caveat that they can opt for higher threshold,' he added.The raised exemption threshold will allow around 20 lakh taxpayers to opt out of GST if they chose to..