Let's start with the money the Bush administration has already thrown at the war in Iraq. According to the June congressional testimony of William Beach, director of the Center for Data Analysis, the war has cost $646 billion so far. The new defense budget for 2009 tacks on another $68.6 billion for Iraq and Afghanistan in the coming year. However, military expert Bill Hartung of the New America Foundation puts a conservative estimate of the costs of a single week of the Iraq War at approximately $3.5 billion (or about $180 billion a year).
In other words, the war in Iraq will cost far more in the next year than the Iraq portion of that $68.6 billion Congress is about to pony up in the defense budget, and so will be funded, as has long been true, through supplemental war bills submitted by the Bush administration (and then whatever administration follows). In other words, sometime in 2009 the direct costs of the war the Bush administration once predicted would cost perhaps $50-60 billion in total will stand at more than $800 billion, or $100 billion above the cost (if all goes well, which it won't) of the bailout of the financial system now being proposed in Washington.