"The taxation would be reviewed every 15 days," Bajaj said, adding that it would depend on international crude prices. "If crude prices fall, then windfall gains will cease and windfall taxes would also be removed."
The government believes such windfall gains will cease once prices fall $40 from existing levels, Bajaj said.
Brent crude futures slipped on Monday to about $111.27 a barrel, as fears of a global recession weighed on the market even as supply remains tight amid lower OPEC output, unrest in Libya and sanctions on Russia.
U.S. West Texas Intermediate crude futures were at $108.09 a barrel.