The Nikkei India Services Purchasing Managers' Index (PMI), which tracks services sector output on a monthly basis, rose from 50.3 in February to 51.5 in March.
The Nikkei India Services Business Activity Index posted above the critical 50.0 level, which separates growth from contraction for the second-month running in March.
"India's private sector economy stayed on an upward trajectory during March, benefiting from an upswing in demand and output. The country's rapid recovery from the demonetisation-related downturn was accompanied by job creation and softer inflationary pressures," said Pollyanna De Lima, economist at IHS Markit and author of the report.
Meanwhile, the seasonally adjusted Nikkei India Composite PMI Output Index -- that tracks manufacturing as well as the services sector -- increased to 52.3 in March from 50.7 in February, signalling a quicker rise in private sector activity across the country.
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Going ahead, services companies indicated that activity is expected to rise over the coming 12 months.
On the prices front, though input costs for services firms rose in March, and some services companies raised their own selling prices in that month, the overall rate of charge inflation was "slight".
The RBI policy statement is expected later today. Experts believe the central bank is likely to hold key rates while unveiling the first bi-monthly review of 2017-18.
The Reserve Bank in its policy review meet on February 8 kept key interest rate unchanged at 6.25 per cent and said it is awaiting for more clarity on the inflation trend and impact of demonetisation on growth.
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