US Iran War Costs Soar to $37.5B, Trump Seeks $90B More

Investors are now confronted with a fiscal wildcard: a $37.5 billion war tab that could balloon to well over $100 billion if Congress approves the president’s $90 billion supplemental request. With midterm elections poised to reshape fiscal priorities, the trajectory of defense spending—and the stocks that ride on it—hangs in the balance.

The Pentagon has disclosed that the ongoing US military intervention in Iran has already cost $37.5 billion, a figure that Defense Secretary Pete Hegseth presented to lawmakers on July 21, 2026, during his first public hearing since heavy bombing resumed earlier that month. The sum, which includes certain war expenses and projected costs through September 30, marks an increase of nearly $8 billion from the last public estimate, underscoring the rapid escalation of a conflict that began on February 28 when US and Israeli forces launched a joint bombing campaign. The cost revelation comes as the Trump administration requests nearly $90 billion in additional funding, mostly tied to the Iran war, setting the stage for a bitter fiscal fight in Congress just six months ahead of midterm elections.

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Investors are now confronted with a fiscal wildcard: a $37.5 billion war tab that could balloon to well over $100 billion if Congress approves the president’s $90 billion supplemental request.

The financial scale is staggering even by modern standards. A Reuters source had reported in March that the first six days of operations alone cost at least $11.3 billion, indicating a burn rate that has only intensified with the collapse of a fragile ceasefire and resumption of daily air and missile strikes. Hegseth did not provide a detailed breakdown, leaving lawmakers and analysts to question the methodology behind the $37.5 billion figure, particularly whether it accounts for munitions replacement, veteran care obligations, or broader economic disruptions. The lack of transparency has fueled bipartisan frustration, with Democrats linking the war’s cost to domestic affordability concerns and some Republicans uneasy about an open-ended commitment.

Politically, the timing is explosive. The November 2026 midterms are now the prism through which every war-related decision is filtered. Republicans hold razor-thin majorities in both chambers, and any appropriations bill will likely need Democratic votes. Senate Appropriations Committee Democrats, led by Patty Murray, used the hearing to hammer the administration on strategy and accountability, with Murray warning that the president’s threats of escalation and attacks on civilian infrastructure could amount to war crimes. This political dynamic threatens to delay or condition the $90 billion supplemental request, creating a funding cliff that could disrupt military readiness well beyond the Iran theater.

Beyond the dollars, the human toll is mounting. The US death toll has climbed to 17, with two confirmed killed in an Iranian attack on a base in Jordan, while roughly 430 personnel have been wounded since February. A new wave of 100 injuries since July 7—96% of whom returned to duty—illustrates both the intensity of recent engagements and the strain on medical and support chains. These casualties, combined with the specter of a “forever war,” are eroding public and political support, much as extended Middle Eastern campaigns did in previous decades.