India is currently at the last rung of investment grade, just a notch above the 'junk' status, by all three leading global credit rating agencies - Moody's, S&P and Fitch.
The sovereign rating and outlook for a country are often referred to as key parameters by foreign investors and global bodies to gauge its investment climate.
"Going forward, in the near term, we expect an outlook revision by both S&P and Fitch, while in the medium term, we believe that the ongoing structural reforms, particularly on taxation, could catalyse a sovereign ratings upgrade," Citigroup said in a research note.
The fiscal consolidation process is likely to continue, Citi India Chief Economist Rohini Malkani said.
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According to Japanese brokerage firm Nomura, India's economic fundamentals are improving with the government focused on boosting investment and productivity and Reserve Bank's resolve to keep inflation low.
Moody's had recently raised India's credit rating outlook to 'positive' and said an upgrade in its sovereign rating is also possible in the next 12-18 months.
Since 2004, Moody's has rated India at Baa3 - at par with countries like Indonesia, Iceland and Turkey.
Other global agencies -- S&P and Fitch -- also have the same credit rating for India due to high inflation, huge debt levels of the central and state governments, infrastructure issues and huge bad loans in the banking system.