The reduction comes after a controversial independence reference by the Kurds last year sparked a furious dispute with the central government.
The budget is based on projected oil exports of 3.9 million barrels per day, including 250,000 bpd produced in the Kurdistan autonomous region of northern Iraq, at a price of USD 46 per barrel.
It also projects USD 77.5 billion in revenues and a deficit of USD 10.6 billion, and allocates USD 20.8 billion for investments.
Article 9 of the Iraqi constitution stipulates that Kurdistan's share of the budget must reflect the size of the population of the autonomous region.
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But the text of the budget approved by parliament on Saturday states that the autonomous Kurdish government must export 250,000 bpd and hand over the money it earns from the sales to the federal authorities.
"If Kurdistan does not hand over (the money), the finance ministry will take it from its part of the budget," it said.
Late last year, following the failed Kurdish referendum on independence rejected by Baghdad, federal forces recaptured the oilfields, severing a key lifeline for the Kurds whose economy largely depended on oil revenues.
Iraqi parliament speaker Salim Jubburi today said the 2018 budget had also "resolved" the issue of "salaries for Kurdish civil servants and the peshmerga".
The federal government will resume paying those salaries which had been frozen for the past six month amid demands by Baghdad for an audit to determine the number of civil servants in Kurdistan, he said.
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