Benchmark indices rebounded to ended marginally higher after a day of subdued trading as caution ahead of the launch of a goods and services tax (GST) kept investors on edge. The indices ended the month of June in negative, first monthly loss this year, even after they rose a bit in the late afternoon deals.

The revised tax structure will kick in from midnight, marking India’s biggest tax reform since independence, unifying its $2 trillion economy and 1.3 billion people into a common market.

The S&P BSE Sensex settled the day at 30,921, up 64 points, while the broader Nifty50 was ruling at 9,521, up 17 points.

In the broader market, the S&P BSE Midcap and the S&P BSE Smallcap bucked the trend to gain 0.6% each.