He also expressed hope that the GDP growth can cross 8 per cent in the current fiscal as investment sentiments are turning around and three quarters are still remaining.
"We need a rate cut of 50-100 basis points. I think time is ripe," he told CNBC TV 18.
On the possible Fed rate hike impacting RBI decision, he said the interest rate increase by the US central bank would not be very steep so it should not make a difference.
When asked would it be right if RBI cuts rate by just 0.25 per cent, Panagariya said, "the direction would be right and would add to past 75 basis point reduction and would become one percentage point. May be this will begin the process of the pass through with the little stronger effect."
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The GDP growth slowed to 7 per cent in the first quarter of the current fiscal, from 7.5 per cent in the previous quarter, amid deceleration in farm, services and manufacturing sectors.
"I would not write off the prospect of getting past 8 per cent growth rate. We have had quarter when we had grown 9 per cent, 10 per cent. Three more quarters are left. Pick up required is not huge when we spread it to three quarters," he said.
"Foreign investors who were keeping out are now beginning to return to India. Investors sentiment is now turning around," he said.