In Great Debates, someone posted that the Iraq war is currently costing about $12 billion per month. I don’t know if that’s accurate, but let’s assume it is.
In 2007, the U.S. government had about 2.4 trillion dollars in revenue. Call it 200 billion per month.
Given those figures, the Iraq war is consuming about 6% of the government budget. So let’s say you paid $20,000 in income tax. In that case, you personally coughed up $1200 for the war. However, you said this was the tax on your bonus, which is deducted at your highest marginal rate. So maybe you should just apply this to your bonus - let’s say it was 5K, and $1250 went to tax. So maybe $75 of that went to pay for the war.
But of course, it’s not nearly that simple. For one thing, taxes have not gone up since the war started, so in that sense, you could say you’re paying nothing for the war. For another, there are other sorts of revenue the government collects, such as corporate and excise taxes. Income tax makes up less than half of total government revenue. So we should probably cut your contribution in half, and call it $32.50.
On the third hand, all of the money for the war is borrowed. So you’re not paying a cent. People in the future will.
On the fourth hand, a lot of this accounting is probably fuzzy anyway. The war may be costing a certain amount if you count the salaries of all the soldiers that are there, and the cost of keeping them there. But since the military hasn’t appreciably grown in size since before the war, you have to assume that most of those people would still be drawing a salary, shooting weapons in training and wargames, etc. The true cost of the war in monetary terms would be the additional cost of combat and occupation over and above what the military would have spent if it wasn’t doing those things. But then there are all the guardsmen called up, extra pay for being in a war zone and overseas, extra personnel retained through stop-loss orders, guardsmen called up, rebuilding costs in Iraq, etc.
Given all these variables, plus others (opportunity cost, etc), it’s not surprising that estimates for the cost of the war vary like crazy, from a low of a total so far of about 260 billion over the past five years to a high of over 1 trillion. As you might guess, the low figures tend to come from supporters of the war, and the high figures from opponents. The 12 billion figure quoted at the beginning is pretty much in the middle and probably a good working number.