The general budget in Iraq suffers from a semi-permanent deficit in it, due to Iraq’s dependence on a unilateral revenue represented by oil revenues (a rentier economy), so the concerned authorities in Iraq had to search for other means to maximize their revenues to eliminate that financial deficit, so investment is among the most important means that The countries of the world resort to it to maximize their revenues to address the deficit by balancing them. For what has been presented, we will show in this research the definition of investment and the most prominent stage in Iraq, and then explain its main objectives, advantages and disadvantages. After that, we explained the role of investment in addressing the deficit of the state’s general budget through compressing public spending and achieving public revenues. We touched on the success of Iraq's experience of investing in the education sector and how that sector contributed to providing the state treasury with funds through the collection of taxes and fees, and also helped to pressure public spending by providing infrastructure and providing job opportunities for the unemployed. One of the necessary and necessary proposals for the success of foreign and domestic investment.