… Companies that transport oil are required to pay into the Oil Spill Liability Trust Fund, giving the government a pot of money for immediate spill responses. The Enbridge pipeline in Michigan and the Exxon pipeline in Arkansas, however, are exempt because these pipelines are not considered to be carrying “conventional oil”, despite the fact bitumen spills are more expensive and more dangerous.
In a January 2011 memorandum, the IRS determined that to generate revenues for the oil spill trust fund, Congress only intended to tax conventional crude, and not tar sands or other unconventional oils. This exemption remains to this day, even though the United States moves billions of gallons of tar sands crude through its pipeline system every year. The trust fund is liable for tar sands oil spill cleanups without collecting any revenue from tar sands transport. If the fund goes broke,the American taxpayer foots the cleanup bill.