The $38 Billion Cost of the Iran War, Explained
The Pentagon has spent $38.1 billion on the war with Iran through Aug. 1, 2026, according to the Congressional Budget Office.
The assessment was requested by Rep. Brendan Boyle of Pennsylvania, the ranking Democrat on the House Budget Committee. It covers Operation Epic Fury, the U.S. operation launched alongside Israel on Feb. 28. It had run for six months when CBO reported in September. CNBC
CBO projects another $3 billion in costs each month if the conflict continues. The Strait of Hormuz, a narrow waterway vital for oil shipments, remains under Iranian blockade. Defense Secretary Pete Hegseth had told a Senate hearing on July 21 that the cost stood at $37.5 billion.
The $38 billion figure has clear limits. It does not include recent U.S. strikes on vessels in the Strait of Hormuz or Iranian attacks on U.S. military installations in the region. It also excludes borrowing costs, which CBO said could add tens of billions of dollars.
Munitions and readiness
Much of the cost came from missile defense. CBO said $25 billion worth of weapons have been used so far, depleting key U.S. missile defenses. The Guardian
CBO estimated it could take five years to restore those stockpiles. That timeline reflects factory output, repair depot capacity, and industrial limits, not just funding from Congress. Like drawing water faster than rain can refill a reservoir, interceptors are being used faster than they can be built.
Pentagon counts for earlier periods point in the same direction. The Pentagon's Office of Inspector General reported $33 billion in costs between Feb. 28 and June 30, including $22 billion for expended munitions. The Department of War separately estimated $33.4 billion for Operation Epic Fury as of June 29, 2026, including $7.4 billion in cumulative obligations, or money promised in contracts but not yet paid.
Economic transmission
CBO projected the war will lift inflation by 0.5 percentage points in the first three months of 2027. U.S. inflation had already accelerated after renewed fighting in the Middle East pushed fuel prices higher, with diesel prices hitting record levels.
Average U.S. retail gasoline prices crossed $3 per gallon for the first time since November as the conflict worsened. The most direct link is energy: disruption around Hormuz raises costs for shipping, insurance, refining, and diesel freight, and those costs pass through to consumers.
The backdrop is a national debt that topped a record $40 trillion. War spending financed by borrowing carries interest costs outside the $38 billion operations total, which is why CBO separated direct Pentagon costs from debt service.
Political break
The U.S. House voted to end the Iran war, with seven Republicans voting in favor. Al Jazeera
An earlier Reuters/Ipsos poll published March 31 found 60% of Americans opposed U.S. military strikes on Iran, while 74% of Republicans supported them. That survey came before the September cost accounting and the House vote.
President Trump defended the war as necessary to keep Iran from developing a nuclear weapon. That has remained the administration's stated objective since the February escalation.
The broader context here is how operational pace wears down long-term strength. Missile defense dominates the ledger because each interception costs far more than the incoming weapon, and sustained defense of bases, shipping lanes, and partner territory consumes interceptors faster than production replaces them. A five-year restocking horizon limits flexibility elsewhere, especially for commitments that depend on those defenses.
Looking at what this means for Washington, the dispute is now as much about baselines as strategy. Inspector General, departmental, and CBO estimates differ by date, scope, and whether they count obligations or actual spending, yet all describe a burn rate near $3 billion per month before wider effects. With Hormuz still blocked, price increases expected into early 2027, and a House majority seeking termination, the report gives lawmakers a common number for debates over war powers, appropriations, and diplomacy.
In my view, the next phase turns less on the $38.1 billion already spent than on whether blockade, interceptor use, and borrowing costs keep compounding. If they do, pressure will build to pair military posture with a diplomatic channel able to reopen Hormuz and cap escalation, because supplemental funding alone cannot quickly resolve the readiness and price constraints CBO identified.
