US War in Iran Costs Exceed $37.5 Billion, Pentagon Tells Congress

The United States' military conflict in Iran has cost $37.5 billion so far, U.S. Defense Secretary Pete Hegseth announced Tuesday, representing an increase of nearly $8 billion since the last public estimate.

Testimony on Capitol Hill

Speaking before the Senate Appropriations Committee, Hegseth stated that the figure includes both direct war-related expenditures and anticipated costs through September 30. The disclosure marks the first time the Defense Secretary has publicly faced lawmaker questions since operations against Iran resumed earlier this month following the collapse of a ceasefire.

While the Pentagon did not detail the methodology behind the calculation, the new total shows a rapid acceleration in spending. A source had previously told Reuters in March that the administration estimated the first six days of the conflict, which began in late February, cost at least $11.3 billion. Hegseth also warned lawmakers that military training would have to be curtailed without an urgent injection of new funding.

Conflict Escalation and Human Cost

The rising financial toll comes amid an intensifying military situation. Both the U.S. and Iran have been carrying out daily strikes since a fragile truce collapsed. The human cost of the conflict is also mounting, with U.S. casualties including:

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• 17 troops killed
• Roughly 430 troops injured

In recent days, President Donald Trump has publicly threatened to expand U.S. targets to include Iranian energy infrastructure, such as the Kharg Island oil hub, and a fortified nuclear-linked facility. These threats introduce significant geopolitical risk and uncertainty for global energy markets.

Political and Market Implications

The war's growing expense is becoming a focal point in Washington, just six months ahead of midterm elections. The rising costs and casualties provide a new line of attack for Democrats, who are seeking to link the unpopular conflict to domestic affordability issues.

For investors, the primary concern is the potential for disruptions to global oil supplies. Threats against key Iranian energy assets could create significant volatility in crude oil benchmarks like Brent and WTI. The substantial and ongoing fiscal expenditure also adds to long-term U.S. budgetary pressures.