Net profit in the fourth quarter of 2014-15 was Rs 6,285.35 crore, or Rs 25.89 a share -- 33 per cent lower than Rs 9,389.85 crore, or Rs 38.67 a share in the year ago period, IOC said.
IOC Chairman B Ashok told reporters here, "In the fourth quarter of 2013-14, we had received Rs 7,735 crore fuel subsidy for previous quarters, pushing up the profits.
IOC and other state-owned fuel retailers sell domestic LPG and kerosene at government controlled rates and losses thus incurred are made good through cash subsidy and dole from oil producers like ONGC.
The firm earned USD 8.77 on turning every barrel of crude oil into fuel in the January-March quarter, as opposed to a gross refining margin (GRM) of USD 2.17 per barrel in the same period of 2013-14.
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IOC had lost Rs 3,221 crore in revenue in the fourth quarter of 2014-15 on cooking fuel sales, all of which were compensated.
"We had an inventory loss of Rs 15,600 crore in 2014-15 as against an inventory gain of Rs 3,990 crore in the previous year," Ashok said.
IOC refineries processed 53.6 million tons of crude oil in 2014-15 as compared to 53.1 million tons in the previous fiscal, he said.
Fuel sales rose to 71.8 million tons, from 70 million tons in 2013-14, with petrol (8.3 million tons) and diesel (34.5 million tons) leading the charge.
"The year was indeed very challenging but we have been able to keep out performance up, our spirits up and our service orientation up," Ashok said, adding that the benchmark Brent crude oil fell from high of USD 115.32 a barrel in mid-June to USD 45.22 in mid-January.