posted by Christopher W. Holton
The Islamic State derives at least a significant portion of its income from oil revenue. U.S. air strikes have reduced that revenue stream. Also, because the number of people living under the direct control of the Islamic State has declined, tax revenues have declined. All of this data comes from a firm called IHS and cannot be verified at this time.
Here is the firm’s breakdown of Islamic State revenue sources:
Around 50 percent of the group’s revenue comes from taxation and confiscation, 43 percent from oil and the rest from drug smuggling, sale of electricity and donations…