The U.S. military has spent more than $47 billion on the war in Iran, according to a Pentagon estimate obtained by Reuters, pushing the cost of the conflict more than 25% above a July estimate cited by Defense Secretary Pete Hegseth. The updated figure comes as Washington weighs the possibility of renewed heavy fighting and as the conflict’s effect on energy prices becomes a major domestic political issue ahead of the November midterm elections.
More than $29 billion of the estimate is tied to replacing munitions used in combat. Another $6 billion or more would be needed to replace aircraft, drones and other equipment lost or damaged during operations.
The bill is still incomplete
The Pentagon estimate does not appear to fully capture the cost of repairing U.S. bases damaged by Iranian missile and drone attacks. That means the eventual total could rise substantially even without a new major offensive.
Operational costs include flight hours, logistics, cyber support, air defense and the replacement of high-end precision weapons. Those categories can expand quickly during an extended conflict.
Munitions account for the largest share
The more than $29 billion earmarked for replacing expended munitions illustrates how costly modern air and missile warfare has become. U.S. forces initially relied heavily on expensive precision weapons to strike Iranian defenses and command infrastructure.
Washington’s strategy was designed to degrade air defenses quickly so lower-cost weapons could be used later. An April ceasefire, however, gave Iran time to restore some underground facilities and military capabilities.
The conflict has become a budget issue
Military spending on Iran is now large enough to compete with other Pentagon priorities, including Indo-Pacific deployments, weapons procurement and stockpile replenishment.
Congress will ultimately have to determine how much of the cost is covered through existing defense budgets and how much requires supplemental funding.
Energy prices are widening the political impact
The war has contributed to higher oil and refined-fuel prices, creating costs far beyond the Pentagon. Rising gasoline and diesel prices are feeding into household budgets, freight rates and inflation.
That economic pressure has become politically significant as Republicans defend narrow majorities in Congress.
Trump’s original timeline proved optimistic
President Donald Trump launched the war with Israel in February and initially predicted a short conflict. The campaign instead evolved into a prolonged confrontation that included direct attacks on U.S. facilities and a naval blockade aimed at reducing Iran’s oil revenue.
The gap between the original expectation and the current cost estimate is likely to intensify congressional scrutiny.
Stockpile replacement could take years
Replacing advanced missiles is not simply a matter of spending money. Production lines for air-defense interceptors and long-range precision weapons operate at limited capacity, and manufacturers need time to expand output.
That creates a readiness question: money appropriated today may not translate into replenished inventories for months or years.
Indo-Pacific commitments add pressure
The Pentagon is simultaneously trying to reassure allies in Asia that the Iran conflict will not weaken U.S. commitments in the Indo-Pacific. Defense planners must balance immediate Middle East demands against long-term competition with China.
Large weapons expenditures in one theater can therefore have strategic consequences elsewhere.
The estimate will become a campaign issue
The Iran war is increasingly being debated not only in security terms but in economic ones. Voters are seeing the conflict through fuel prices, inflation and federal spending as well as military risk.
If fighting resumes after the midterms, the $47 billion figure may quickly become a baseline rather than a final cost.
Sources
- Reuters, Oct. 28, 2026
- Pentagon cost estimate cited by Reuters
Repair costs could push the total higher
The estimate’s biggest limitation is that it may not fully include the cost of repairing U.S. bases hit by Iranian missiles and drones. Hardened shelters, radar systems, runways and communications infrastructure can be expensive to restore, particularly when repairs must be carried out while operations continue.
That means the eventual cost could rise even if major combat remains paused. A renewed campaign would add new weapons expenditure on top of a repair bill that is still being calculated.
Congress will scrutinize replacement capacity
Lawmakers are likely to focus not only on dollars spent but on how quickly depleted weapons can be replaced. The United States must replenish stockpiles while maintaining commitments to Europe and Asia, making industrial capacity a central part of the debate.
