Baghdad, strapped for cash amid a plunge in oil prices and higher military expenditure associated with the fight against the terrorist group, will manage to fund less than 43 percent of those needs from its budget, the report said.
"The international community is necessary for bridging the deficit or financing gap," it added.
The conflict has displaced more than 3.3 million people since 2014. The Iraqi government allocated around $850 million last year for efforts to shelter such families and help them return to recaptured areas, but it ended up funding less than 60 percent of that, the report showed, according to Reuters.
Daesh seized about a third of Iraq's territory in the north and west in 2014, but has slowly been pushed back by Iraqi forces, volunteer forces and Kurdish peshmerga fighters.