DID Press: Amid the ongoing conflict between the United States and Iran, questions over the financial toll of the war are intensifying in Congress, the media, and public debate. According to the Center for Strategic and International Studies (CSIS), the first 100 hours of the conflict have cost approximately $3.7 billion—roughly $900 million per day—with $3.5 billion of that spending not yet accounted for in the official U.S. defense budget.
The expenditures are divided into three main categories:
- Operations and support: $196 million
- Replacement of expended munitions: $3.1 billion
- War damage and infrastructure repair: $350 million
Most of these costs fall outside the pre-approved budget, likely requiring supplementary funding from Congress.
Breakdown of costs:
- Operations and support: Daily air operations from land bases cost $30 million, while naval deployments—including two aircraft carriers, 14 destroyers, and three coastal combat ships—added $15.4 million per day. Additional units, including artillery, air defense, and a National Guard battalion, are calculated as part of overall operational costs.
- Munitions replacement: Over 2,000 munitions were fired in the first 100 hours, including long-range Tomahawk missiles at $3.6 million each and JDAMs at $80,000 each. Replacement is projected to cost $3.1 billion, or about $758 million daily.
- Equipment and infrastructure damage: Estimated at $359 million, including the loss of three F-15 aircraft in friendly-fire incidents over Kuwait ($309 million) and damage to port and support facilities in Kuwait and Qatar ($50 million).
CSIS notes that initial days of air campaigns are typically the most expensive, and although costs may stabilize as operations slow, much of the expenditure remains outside the approved defense budget. This pattern mirrors the early phases of previous U.S. conflicts in Iraq and Afghanistan.
Outlook:
The Trump administration now faces difficult choices on financing this unexpected cost: supplementary budget requests, reallocation within the Department of Defense, or ad hoc appropriations. Any such action will underscore the financial strain of a war that was not accounted for in official planning or supported broadly by public opinion. Each additional dollar requested highlights the reality that the U.S. is rapidly committing resources to a conflict with high domestic political and economic stakes.