ISIL's sources of income include oil and gas sales, extortion and taxation, external donations, kidnapping-for- ransom, and previously, bank looting, Daniel Glaser, the Treasury's assistant secretary for terrorist financing said.
"We estimate that in 2015, ISIL made approximately USD 1 billion dollars in total revenue, USD 500 million of which came from the sale of oil, primarily through populations under its control," Glaser said, using the US's preferred acronym for Islamic State.
ISIL also gained considerable funds from seizing control of state-owned banks in northern and western Iraq in 2014 and early 2015, he told the lawmakers.
"These funds from the bank vaults were estimated to be at least half a billion dollars at the time of capture, making them an important, albeit non-renewable, source of financing for ISIL in its earlier days," Glaser said.
"We estimated that ISIL earned between USD 20 and USD 45 million from KFR in 2014. However, we assess revenue from KFR declined substantially in 2015 and 2016 owing to the greatly reduced presence of potential Western hostages in or near the territories it controls," he said.
The senior official said the ISIL clearly has vast financial resources, but the Obama administration has seen indications that America's efforts to disrupt ISIL's sources of revenue are bearing fruit.
Through airstrikes, the Coalition has directly targeted ISIL's entire oil and natural gas supply chain: from oil fields, to refineries, to tanker trucks, targeting ISIL's primary source of revenue, he claimed.
Glaser also said that recent Coalition strikes have also reduced the levels of cash in ISIL-controlled territory.
US-led Coalition airstrikes have targeted ISIL's cash storage sites, destroying tens of millions, and possibly more than 100 million dollars, and eliminated senior ISIL officials, including the group's de facto finance minister.
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The Treasury Department official said the US has also worked closely with the Iraqi Government to reduce liquidity in ISIL-held areas.
"One of the most important steps taken by the Iraqi government was its decision in August 2015 to ban the distribution of government salaries into ISIL-held areas, thereby eliminating ISIL's ability to tax these funds," Glaser said.
As of February 2016, ISIL had also begun levying taxes on the poorest civilians, who had previously been exempt from taxation, he said.
"When we see indications that ISIL cannot pay the salaries of its own fighters and is trying to make up for lost revenue elsewhere, we know we are hitting them where it hurts," the official told lawmakers.
Glaser said denying ISIL access to the international financial system represents the second prong of America's strategy to counter its financing.
ISIL likely uses certain exchange houses as important points of access to the financial system. In response, the Central Bank of Iraq (CBI) has identified and developed a dynamic list of over 100 ISIL-related exchange houses that are prohibited from accessing the CBI currency auction in Iraq. The list has been published on the CBI's website and shared with regional governments to enable them to take steps to prevent these banned exchange houses from accessing their respective financial systems.
Glaser said that the challenge of countering ISIL's finances is not an impossible one.
"ISIL, like any terrorist organisation, needs money to survive and diverse efforts are underway to deprive ISIL of its resources and deny it access to the international financial system," he said.
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