Key facts
- The Iran war has cost US taxpayers an estimated $42.99 billion as of September 15, 2026.
- The Congressional Budget Office estimates the conflict costs $2 billion to $3 billion per month.
- The war has depleted U.S. weapons stockpiles, including critical air defense interceptors.
- An independent estimate placed the cost of the first four months of the war through June 27 at $103 billion.
- The Pentagon is seeking a $1.5 trillion war and weapons budget for the next year, with potential additional requests of up to $200 billion for the Iran war.
The ongoing military conflict in Iran has incurred significant costs for U.S. taxpayers, with estimates varying but consistently pointing to billions of dollars spent and a depletion of military resources. The Congressional Budget Office (CBO) reported that the first five months of the war cost $38 billion and projected ongoing monthly expenses of $2 billion to $3 billion. This figure represents a substantial portion of the Trump administration's total war spending request.
An independent tracker from militaryspend.org estimated the total cost to U.S. taxpayers at $42.99 billion as of September 15, 2026, with daily standby costs during ceasefires at approximately $95 million. This tracker utilizes data from CSIS, the Pentagon, and Penn Wharton models, breaking down costs by category including munitions, air operations, naval operations, equipment losses, intelligence, and personnel.
Separately, a fact sheet developed by IPS stated that the first four months of the war, through June 27, cost $103 billion, which included at least $2.9 billion in military aid to Israel. The Pentagon is seeking a $1.5 trillion war and weapons budget for the upcoming year, with potential additional requests of up to $200 billion for the Iran war, which could bring the total war budget as high as $1.7 trillion if approved by Congress. The war has also led to the depletion of U.S. weapons stockpiles, including critical interceptors for air defenses.