Rank-and-file Islamic State militants get paid about $50 per month, but also receive extra money for wives, children, sex slaves and the children of their sex slaves, according to newly disclosed documents.

On top of their base pay, the individual militants receive an additional $50 for each wife, $35 each for their wives' children, $50 for each sex slave and $35 for each of their sex slaves' children, according to the Islamic State group's administrative documents recently published by the Combating Terrorism Center based at West Point, New York.

For example, the documents include pay data for one soldier who was receiving $360 per month based on having two wives and six children.

The documents were reportedly left behind in Syria's Hasaka province after American-backed Syrian rebels seized control of the area earlier this year. The documents were provided to the report's author, Aymenn Jawad al-Tamimi, by a Syrian Kurdish journalist and published online. They were published by the CTC, which is affiliated with the U.S. Military Academy.

The report notes "there is still a degree of uncertainty as to the exact scales of salaries among Islamic State members and fighters, and how they may vary, if at all, by rank and region."

The documents belie claims on social media that the Islamic State group, also known as ISIS or ISIL, pays up to $800 per month for foreign fighters.

The documents show evidence that ISIS is under financial strain as U.S airstrikes in recent months have targeted both its cash storage depots and its fleet of oil tankers that provide an important source of revenue.

In December ISIS leaders called for a crackdown on unauthorized use of government vehicles.

"The brothers' use of transport and vehicles belonging to [Islamic State authorities] outside of operation times, which is causing an unjustified waste in the Bayt Mal al-Muslimeen [financial treasury], reaching the point of forbidden excess," one document said, according to the report.

"It has therefore been decided to direct all brothers not to use vehicles affiliated with [the Islamic State authorities] in case of personal needs except by permission from one's emir, and in the event of contravention, an inquiry will be held — by God's permission — with those who infringe on the regulation," according to the report.

Andrew Tilghman is the executive editor for Military Times. He is a former Military Times Pentagon reporter and served as a Middle East correspondent for the Stars and Stripes. Before covering the military, he worked as a reporter for the Houston Chronicle in Texas, the Albany Times Union in New York and The Associated Press in Milwaukee.

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