"Iraqi officials
estimate that Islamic State taxed the salaries at rates
ranging from 20 to 50 percent, and analysts and the
government now estimate a loss of $10 million
minimum each month . Between the loss of that
money — and the U .S.-led bombing of cash
warehouses — American officials are optimistic that
the effect could diminish Islamic State' s wealth .
..."
https://www.washingtonpost.com/world/middle_east/is-faces-budget-crunch-killing-perks-and-slashing-salaries/2016/02/16/26e657ce-d4b1-11e5-a65b-587e721fb231_story.html
