US Defense Secretary Pegs Iran War Cost at $37.5 Billion Through September, Up 30%

Hegseth's Senate Testimony Puts War Cost at $37.5 Billion

The United States' military campaign against Iran is now projected to cost $37.5 billion through the end of September, Defense Secretary Pete Hegseth told a Senate committee on Tuesday. That figure marks a nearly 30% increase from the Pentagon's previous estimate of $29 billion, reflecting the intensifying scale of operations in the region.

Hegseth was on Capitol Hill to defend the Trump administration's request for a $67 billion supplemental funding package for the Defense Department. The new estimate underscores the growing financial strain of a conflict that has seen American forces strike Iranian infrastructure for ten consecutive nights, including command centers and maritime targets. The White House has made clear the campaign is not nearing its end.

President Donald Trump reinforced that message later on Tuesday, stating the US had "not finished at all" with Iran. He asserted that leaving now would allow Tehran to rebuild its military capabilities in two decades, but that the current strategy aims for a more durable outcome. While the Pentagon's assessment puts a price on the immediate phase, no timeline for a drawdown has been offered.

In a sign of the conflict's widening arc, Iran announced it had retaliated against US allies Kuwait, Bahrain and Jordan, striking targets in all three countries. The attacks add a new layer of regional risk and underline the difficulty the US faces in containing the fallout to Iran alone.

Why Costs Are Ballooning and What It Means for US Strategy

The Budget Debate: A $67 Billion Steep Request

Hegseth's testimony was designed to build Senate support for the administration's emergency funding request. The $67 billion supplement would cover not only the Iran operations but also replenish munitions stocks and support other global commitments. Early reactions from lawmakers were mixed, with fiscal hawks questioning the lack of a clear exit strategy, while defense hawks argued that failing to fund the operation would embolden Tehran. The 30% upward revision in war costs will sharpen those discussions, forcing Congress to weigh a rapidly growing bill against strategic objectives that remain loosely defined.

Oil Markets and Regional Instability

The Iranian retaliation against Kuwait, Bahrain and Jordan directly threatens stability in a region critical to global energy flows. While the precise targets remain unclear, any disruption to oil infrastructure or tanker traffic in the Persian Gulf could push crude prices sharply higher. Markets have largely priced in a contained conflict so far, but a sustained campaign with cross-border strikes raises the risk of a broader supply shock, particularly if the Strait of Hormuz becomes a flashpoint.

Contractors Under Pressure — but Opportunity Looms

For the US defense industrial base, the extended campaign spells a surge in orders for precision munitions, drones, and missile defense systems. Companies like Lockheed Martin, Raytheon and Northrop Grumman are likely to see accelerated contract awards as the Pentagon replenishes stockpiles. However, production capacity limits and labor shortages could create bottlenecks, and any delay in the supplemental appropriation would squeeze cash flow. Investors should watch for emergency contract announcements in the coming weeks as a signal of both opportunity and execution risk.

Strategic Consequences: No End in Sight

Trump's unambiguous statement that the US is "not done at all" signals that the current round of bombing is part of a longer campaign aimed at degrading Iran's military infrastructure. That posture increases the likelihood of mission creep, higher casualties, and a multi-year budget commitment. It also complicates diplomatic efforts to contain the conflict, as allies struck by Iranian forces may demand Washington escalate further or provide additional defenses. The financial trajectory will depend heavily on whether the operation remains largely air- and naval-based or evolves to include ground forces, a step the Pentagon has so far avoided discussing publicly.

What's Next for the Pentagon, Contractors and the Region

• Defense contractors should prepare for a rapid increase in orders for munitions and support systems, but also model for supply chain constraints that could delay deliveries. Watch for emergency contracting authority to be invoked to speed procurement.
• Investors in aerospace and defense should monitor the supplemental's progress; a quick passage in a bipartisan vote would be a bullish signal, while prolonged negotiations could create near-term volatility in valuation multiples.
• Energy sector executives must stress-test supply chains against a potential disruption in the Persian Gulf. Hedging strategies and inventory buffers for refined products become more urgent if Iranian retaliatory strikes escalate.
• US allies in the Gulf — Kuwait, Bahrain and Jordan — face immediate security demands. Washington may need to divert intelligence and air defense assets from other theaters, straining broader military readiness and forcing hard choices about global force posture.
• Congressional overseers will need to demand clearer metrics of success from the Pentagon before committing to a multi-year funding stream, given the steep cost trajectory outlined by Hegseth.