Defense Secretary Pete Hegseth says the war with Iran has cost the U.S. about $37.5 billion so far, a figure that immediately sharpened debate over the price of the conflict and the Trump administration’s request for more Pentagon money. Hegseth told lawmakers the estimate includes some expected costs through the end of the fiscal year, which helps explain why it is higher than the Pentagon’s previous public figure of $29 billion from May.
What Hegseth told Congress
Hegseth gave the new estimate during a Senate appropriations hearing on President Donald Trump’s supplemental defense funding request, saying the number reflects current activity and additional operations, maintenance and pay costs anticipated through September 30. When pressed by Sen. Dick Durbin, Hegseth said, “The estimate we have as of today is $37.5 billion,” and indicated the total could still rise as more war-related expenses are booked.
The disclosure is notable because the Pentagon had not previously published such a comprehensive figure in public, even as lawmakers and outside analysts had been pressing for clearer accounting of the operation’s costs. Hegseth’s testimony also came as the administration seeks roughly $67 billion in supplemental Pentagon funding, making the war’s price tag central to the budget fight on Capitol Hill.
The new estimate appears to fold in categories that earlier figures may not have fully captured, including military pay, operations and maintenance, repairs, and replacement of damaged or expended equipment. Reuters reported in May that the Pentagon’s earlier estimate of $29 billion had already risen from $25 billion in late April.
How the number compares
The jump from $29 billion in May to $37.5 billion in July suggests the cost curve has remained steep, even after the opening weeks of intense air and naval operations. In March, Pentagon officials privately told lawmakers that the first six days alone had cost at least $11.3 billion, a figure that excluded some deployment and support costs.
Outside analysts have consistently argued that official figures have lagged behind the real bill because they often omit long-tail costs such as munitions replacement, aircraft maintenance and the downstream expense of keeping forces deployed. One early CSIS estimate put the first 100 hours of the operation at $3.7 billion, while later public estimates moved sharply higher as the conflict dragged on.
Estimated cost timeline
| Date / period | Estimate | Source |
| First 100 hours | $3.7 billion | CSIS estimate cited by CNN and others |
| First 6 days | $11.3 billion | Pentagon briefing to lawmakers. |
| April 29 | $25 billion | Pentagon estimate reported by Reuters. |
| May 12 | $29 billion | Pentagon estimate reported by Reuters. |
| July 20 | $37.5 billion | Hegseth testimony to Senate appropriators. |
Why lawmakers care
The cost debate is about more than one war; it is about the Pentagon’s broader credibility on budgeting and oversight. Senators have complained that official estimates arrive in fragments, making it difficult to assess how much of the conflict is being financed through regular appropriations versus emergency requests.
Democrats in particular have pressed for a fuller accounting of munitions use, base defense, troop deployments and equipment replacement, arguing that taxpayers deserve a transparent breakdown before Congress signs off on more money. Even some Republicans have signaled discomfort with open-ended funding if the White House cannot explain where the money is going and how quickly stocks can be replenished.
The supplemental request under review would help cover not only the Iran conflict but also production, modernization, and other defense priorities, further blurring the line between war costs and broader Pentagon spending. That overlap is likely to complicate negotiations, especially if lawmakers try to attach restrictions or reporting requirements to the package.
The broader budget picture
The administration’s push for more military funding comes as defense spending has already surged under Trump’s second term, with the White House seeking what critics describe as a historically large Pentagon budget. Hegseth’s updated war figure will likely strengthen arguments inside the administration for emergency appropriations, but it also gives budget hawks a fresh example of why they say war spending can quickly outpace initial estimates.
Defense analysts warn that the headline number may still understate the eventual bill. As operations continue, the U.S. will likely face continued spending on munitions, repair, and rotation of forces, along with possible long-term costs if equipment wear, troop benefits and deferred maintenance accumulate.
The conflict has also carried wider economic effects, including pressure on shipping lanes, energy markets and regional security commitments, though those costs are harder to capture in a Pentagon line item. That makes the $37.5 billion figure both politically useful and analytically incomplete: it is a snapshot of direct defense spending, not the full bill to the U.S. economy.
What comes next
The next major test will be whether the Pentagon can sustain support for its supplemental request in a Congress increasingly skeptical of open-ended conflict spending. Lawmakers are expected to seek more detailed breakdowns of how the $37.5 billion is calculated, what portion is already spent, and what portion is projected through the end of the fiscal year.
For now, Hegseth’s testimony marks the clearest public statement yet of how expensive the Iran war has become for the United States. It also ensures that the debate over Iran will continue not just in military and diplomatic terms, but in dollars, cents, and deficit politics.
