The official sales price for oil must be lower to preserve Iran's market position and to retain clients, the report said.
After Saudi Arabia lowered its sale price, Iran's oil buyers began purchasing from Saudi Arabia, the report added.
Saudi Arabia was the first to reduce its official sales price for oil, and the move was followed by other oil-producing countries, the report said.
Mohsen Ghamsari, manager of the department of international affairs in the National Iranian Oil Company, said that Iran would discount its official sales price. But the move is a financial change, and is not about competition with Saudi Arabia.
Saudi Arabia reduced its official sales price to the U.S. in early December, to compete with the booming domestic oil production and to maintain its market share amid falling oil prices.
The global benchmark Brent crude oil price has decreased nearly 50 percent since June, and has stabilized around $60 per barrel this week.
Despite having the fourth-largest proved crude oil reserves in the world, Iran's crude oil production decreased dramatically due to sanctions, to one million barrels per day in 2013 from 4.2 million barrels per day in 2011, according to the U.S. Energy Information Administration.
The International Monetary Fund estimates that Iran's oil and natural gas export revenue fell in the fiscal year of 2013-2014 by 11 percent to $56 billion.