Originally Posted by MrBaldBastard

FY2003 Supplemental: Operation Iraqi Freedom: Passed April 2003; Total $78.5 billion, $54.4 billion Iraq War

FY2004 Supplemental: Iraq and Afghanistan Ongoing Operations/Reconstruction: Passed November 2003; Total $87.5 billion, $70.6 billion Iraq War

FY2004 DoD Budget Amendment: $25 billion Emergency Reserve Fund (Iraq Freedom Fund): Passed July 2004, Total $25 billion, $21.5 billion (estimated) Iraq War

FY2005 Emergency Supplemental: Operations in the War on Terror; Activities in Afghanistan; Tsunami Relief: Passed April 2005, Total $82 billion, $58 billion (estimated) Iraq War

FY2006 Department of Defense appropriations: Total $50 billion, $40 billion (estimated) Iraq War.

FY2006 Emergency Supplemental: Operations Global War on Terror; Activities in Iraq & Afghanistan: Passed February 2006, Total $72.4 billion, $60 billion (estimated) Iraq War

FY2007 Department of Defense appropriations: $70 billion(estimated) for Iraq War-related costs

FY2007 Emergency Supplemental (proposed) $100 billion

FY2008 Bush administration has proposed around $190 billion for the Iraq War and Afghanistan

FY2009 Obama administration has proposed around $130 billion in additional funding for the Iraq War and Afghanistan.

FY2010 Obama administration proposes around $159.3 billion for the Iraq and Afghanistan wars.

According to a Congressional Budget Office (CBO) report published in October 2007, the U.S. wars in Iraq and Afghanistan could cost taxpayers a total of $2.4 trillion by 2017 when counting the huge interest costs because combat is being financed with borrowed money. The CBO estimated that of the $2.4 trillion long-term price tag for the war, about $1.9 trillion of that would be spent on Iraq, or $6,300 per U.S. citizen.
The most recent CBO report, which was conducted after the end of combat operations and hence did not have to estimate future costs, was released in December 2014. It placed the cost of the war operations in Iraq as of January 1, 2014, at $815 billion out of the total $1.6 trillion approved by Congress since September 2001.

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And then... there was the global recession.