"Unless the budget is followed by a more specific implementation plan, as well as additional measures to address macroeconomic imbalances, its credit effect will be modest," said Moody's Investors Service Senior VP Atsi Sheth.
Finance Minister Arun Jaitley presented his maiden budget last week in which he vowed to contain fiscal deficit at 4.1 per cent this year and lower it to 3 per cent by 2016-17.
"A smaller fiscal deficit would be credit positive since India's weakening public finances have fuelled inflation, raised domestic interest rates and heightened macroeconomic imbalances, constraining sovereign credit quality," she said.
"Lack of detail makes it difficult to assess the feasibility and sustainability of the fiscal consolidation effort," it added.
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The budget includes measures to support faster economic growth, such as allowing greater foreign direct investment in insurance and defence, increasing spending on infrastructure, and introducing tax incentives for savings and investment.
"These policies are credit positive for the corporate and infrastructure sectors. However, their effect on overall GDP growth will be muted without a decline in inflation, interest rates and regulatory constraints on private investment," Seth said.
India's economic growth is expected to improve to between 5.4-5.9 per cent in the current fiscal, from 4.7 per cent in 2013-14.