Why record high GST collection is an exception and not a norm yet

India’s goods and services tax revenue touched the highest ever in April, but the spurt in collections is far from becoming the norm just yet. Collections from the nationwide  sales tax rose 10 per cent to Rs 1.13 trillion ($16 billion) in April from a year ago, official data show. While that was the closest to the Rs 1.15 trillion monthly target set by Prime Minister Narendra…