The Pentagon has quietly informed Congress that the cost of the ongoing war with Iran has now surpassed $42 billion, a sharp increase of $4.5 billion from the last public estimate, according to a congressional aide who spoke to The Hill on Monday. The updated figure, provided to defense committees on Aug. 13, marks the first official revision since Defense Secretary Pete Hegseth testified in July that the conflict had cost $37.5 billion.
The new number, however, may still understate the true financial burden. Independent experts have suggested the actual cost could be far higher. Linda J. Bilmes, a senior lecturer at Harvard Kennedy School, estimated in July that the war had already cost around $100 billion, a figure that includes broader economic and long-term veteran care costs.
Democratic lawmakers have repeatedly pressed the Trump administration for a full accounting of the conflict's expenses. In response, the Pentagon's comptroller's office, led by Jules "Jay" Hurst, said on social media platform X that the department, along with the Office of Management and Budget (OMB), has provided Congress more than 10 "timely updates" on the cost, covering obligations, operational costs, and unfunded replacement needs. The comptroller's office said the latest update was sent on Aug. 28, but when reached for comment, it referred The Hill back to that post.
Hurst's office emphasized its commitment to "transparency and accountability with Congress as mandated by law, without compromising the security of our servicemembers." However, a congressional source said the House Armed Services Committee has received weekly briefings on the war for a "couple" of months but has not been given the total cost of the conflict.
The financial strain is already being felt by American households. The left-leaning Center for American Progress estimated on Aug. 20 that the Iran war has cost at least $1,200 per household.
The administration's request for additional war funding remains stalled in Congress. In June, the White House asked for an $87 billion supplemental package, with roughly $67 billion earmarked for replenishing munitions and other military operational costs. The GOP-controlled House passed a $95 billion package in July, but the Senate has blocked it, with Democrats demanding more detailed oversight.
President Trump has also proposed a record-setting $1.5 trillion defense budget for fiscal 2027, arguing it is necessary to strengthen the military. The administration has sought to push $350 billion through reconciliation, but the window for such a move before the midterms has largely closed. The escalating costs come as the Iran conflict depletes U.S. arsenal and weakens deterrence against China, a concern raised by defense analysts.
With the war dragging on and costs mounting, the political battle over funding is intensifying. Some Republicans argue Pentagon funding must take priority over other spending, while Democrats demand more transparency before approving additional money. The impasse shows no sign of breaking soon.
