According to the global financial services major, this decision further adds to the risk that the government will likely miss its fiscal deficit target for this fiscal.
"Given already stretched fiscal finances due to front- loaded spending and lower non-tax revenues, this decision further adds to the risk that the government will likely miss its 2017-18 fiscal deficit target of 3.2 per cent of GDP," Nomura said in the research note.
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The government announced a reduction in the central excise duty on petrol and diesel by Rs 2 per litre effective October 4, 2017 amid rising international prices.
The fuels will cost Rs 2 a litre less after the first excise duty cut by the Modi government comes into effect. The cost of petrol as on October 3 stood at Rs 70.88 per litre in Delhi while a litre of diesel was priced at an all-time high of Rs 59.14.
The excise duty cut would cost the government Rs 26,000 crore in annual revenue and about Rs 13,000 crore during the remaining part of the ongoing fiscal that ends on March 31, 2018, an official statement announcing the reduction said.
The government, which had between November 2014 and January 2016 raised excise duty on petrol and diesel on nine occasions to take away gains arising from plummeting global oil prices, was criticised for not cutting excise duty despite a sustained rise in fuel prices since July.