AP In this Friday, June 19, 2015 photo provided by a website of the Islamic State group, IS members prepare foodstuff to be handed over to the poor during the Muslim holy month of Ramadan in Mosul, northern Iraq.
While Western governments have launched air strike campaigns on ISIS-claimed oil fields and refineries to stem the flow of funding, latest FT research shows that taxation and confiscation - basically looting - gives the terrorist group nearly the same amount of revenue as it gets from oil.
The FT report says that every time ISIS seizes more land, the fighters are paid using the goods they stole in raids and looting sprees.
According to the FT, ISIS authorities calculate the dollar value of the stolen goods. They then pay the raider responsible for the confiscation a fifth of the market value, then put it up for sale in a local market. ISIS fighters are then able to buy the item for half the local "loot market" value.
Business Insider took a look at the FT's report and highlighted six items here.