According to the Central Board of Indirect Taxes and Customs (CBIC) notification, it has cut the tax on domestically produced crude oil to Rs 10,500 a tonne from Rs 13,300 earlier.
Instead of Rs 13.5 per litre, the diesel will now export at Rs 8.5/litre. Similarly, ATF shipments will cost Rs 5 a litre, from Rs 9 per litre.
The new rates will be effective September 17.
The move follows moderation in the Indian basket of crude to $92.53/barrel on average in September compared with the August average of $97.4/barrel.
It is the fifth revision of the windfall tax since its implementation on July 1.
In the fourth review on August 31, the government raised the windfall taxes, with diesel exports attracting a tariff of Rs 13.5/litre, up from Rs 7. Similarly, shipments of ATF were subjected to an impost of Rs 9/litre, up from Rs 2. The government has also raised the tax on domestically produced crude oil to Rs 13,300/tonne from Rs 13,000.
On July 1, the Centre imposed special additional excise duty of Rs 23,250/tonne on crude and export taxes on petrol, diesel and ATF at Rs 6/litre, Rs 13/litre and Rs 6/litre, respectivelyThe tax on petrol was removed subsequently.