WASHINGTON, Sep 18 – The cost of the U.S. military campaign against Iran has climbed to an estimated $43.6 billion, according to a new assessment from U.S. Central Command provided to lawmakers this week, offering the clearest picture yet of the financial burden created by the conflict.
The estimate covers expenses through Sept. 3 and comes as the war, launched by the United States and Israel on Feb. 28, enters its seventh month. The latest figure is substantially higher than the $38 billion estimate released earlier this week by the nonpartisan Congressional Budget Office for costs through Aug. 1. The CBO has estimated that the conflict could continue adding roughly $2 billion to $3 billion a month to U.S. military expenses, depending on the intensity of operations.
The new Central Command assessment also highlights how quickly the cost of ammunition and other military equipment has increased. Of the $43.6 billion total, about $28.1 billion is attributed to replacing munitions used during the conflict. Another roughly $11.2 billion represents incremental operational costs, while approximately $4.3 billion is tied to replacing military equipment lost or damaged during operations.
Munitions account for most of the growing bill
The scale of weapons spending stands out in the latest accounting. The Congressional Budget Office had placed munitions-related costs at about $21.7 billion through Aug. 1. The new Central Command figure of $28.1 billion means the estimated weapons bill increased by more than $6 billion in just over a month.
Much of that spending has involved sophisticated weapons used in both offensive operations and missile defense. American forces have relied heavily on interceptors fired by systems such as the Army’s Patriot and Terminal High Altitude Area Defense, or THAAD, platforms. Those systems are designed to intercept incoming missiles and have become increasingly important as Iranian forces have launched attacks across the region.
The heavy use of interceptors has also raised concerns about the condition of U.S. weapons inventories. The Congressional Budget Office has warned that replenishing depleted stocks could take years, adding another long-term financial and military consequence to the immediate cost of the war. Other assessments have pointed to pressure on production capacity for advanced munitions as the United States attempts to replace weapons being consumed at a rapid rate.
The effects are being felt beyond the U.S. military. American and NATO officials have raised concerns about shortages of missile interceptors in Europe, while Saudi Arabia has also faced pressure on its defensive missile supplies amid continuing tensions with Houthi forces in Yemen.
The latest $43.6 billion figure also does not represent the full potential cost of the conflict. The Central Command assessment does not include the expense of repairing or rebuilding American military facilities damaged by Iranian attacks in the Middle East.
Iranian missiles and drones have struck U.S. positions in several countries hosting American forces, including Kuwait, Bahrain, Qatar, the United Arab Emirates, Saudi Arabia, Iraq, Oman and Jordan. A recent report from the Pentagon’s inspector general found extensive damage to buildings and other structures at American bases across the region. Those repair and reconstruction costs could add substantially to the eventual bill.
The cost estimates also do not fully capture the longer-term financial consequences of the fighting. Expenses associated with future health care and disability support for injured service members, maintenance requirements for equipment used during the conflict and some other potential obligations can extend well beyond the period covered by the current estimates.
The human cost has continued to rise alongside the financial burden. Pentagon casualty figures have included 18 U.S. service members killed and more than 830 wounded since the conflict began. The fighting has also placed American forces under sustained pressure across a broad Middle Eastern theater.
The war is simultaneously affecting the wider U.S. economy. Disruptions involving oil shipments and regional shipping routes have contributed to volatility in energy markets, while higher fuel and transportation costs have added to concerns about inflation. The Congressional Budget Office has projected that the conflict could have broader economic effects if disruptions to energy supplies and shipping continue.
The growing military bill comes at a time when the Trump administration is seeking a major expansion of defense spending. The White House is pushing a proposed military budget of about $1.5 trillion, which would represent a historic level of defense spending.
Defense Secretary Pete Hegseth defended the proposal during a speech Friday in Austin, Texas, at Saronic Technologies, a company that manufactures drones for the Navy. Hegseth said the administration was seeking the money to make what he described as generational investments in national defense while supporting manufacturing jobs in the United States.
“We’re asking for $1.5 trillion in the current budget to make generational investments to keep our country strong and sustain good, high-paying jobs for American manufacturers like Saronic,” Hegseth said.
The administration is also seeking congressional approval for a separate $95 billion package that would provide additional funding connected to the Iran war and other priorities.
The size of the new estimate has prompted renewed demands on Capitol Hill for greater transparency about the war’s financial cost. Democratic senators have asked Hegseth to provide Congress with a more complete accounting, arguing that lawmakers and the public should have a clearer understanding of how taxpayer money is being spent as military operations continue.
The Pentagon’s latest one-page breakdown provides figures for operating warships, aircraft and bases, along with equipment losses and medical support for service members. But lawmakers seeking a fuller accounting say the available figures leave important expenses outside the reported total.
The differences between the various government estimates also reflect the difficulty of calculating the cost of an ongoing war. The CBO’s estimate through Aug. 1 was based partly on government data and publicly available information, while Central Command’s newer assessment extends through Sept. 3 and provides a more detailed accounting of current military expenses. The Pentagon has previously provided other estimates, including a $37.5 billion projection for costs through the end of September.
For the United States, the $43.6 billion figure therefore represents more than a running total of money already spent. It also points to the broader financial demands that could continue if the conflict remains active, particularly as expensive missiles and other munitions are replaced and damaged military infrastructure is assessed.
With fighting continuing and the administration seeking additional defense funding, the cost of the Iran war is likely to remain a central issue in congressional debates over military spending. The financial impact will also intersect with wider concerns over energy prices, weapons inventories, military readiness and the long-term obligations created by the conflict.