U.S. military operations against Iran have cost an estimated $40 billion, according to an unpublished study by the Center for Strategic and International Studies (CSIS) obtained by CNN.
Mark Cancian, a senior adviser at CSIS, detailed that the staggering figure accounts for expended munitions, decommissioned hardware, and structural damage inflicted upon U.S. military assets. Crucially, this sum excludes baseline operational costs, which had already been absorbed into the Pentagon’s Fiscal Year 2026 budget.
Breaking Down the Interagency Financial Burden
While the Department of Defense shouldered the vast majority of the financial hit, the multi-month conflict triggered substantial secondary costs across the executive branch.
- Interagency Spillovers: Non-defense government entities incurred an additional $1 billion in conflict-related expenditures.
- Domestic & Veteran Care: The Department of Homeland Security (DHS) and the Department of Veterans Affairs (VA) faced the heaviest secondary strains, managing increased domestic security postures and medical treatments for service members.
- The May Estimates: The updated $40 billion assessment marks a significant leap from the Pentagon’s internal report submitted to the Senate Armed Services Committee in May, which initially pegged raw combat operations at $29 billion.
The Road to the Bürgenstock Ceasefire
The massive financial toll comes to light just days after the United States and Iran signed a historic Memorandum of Understanding on the night of June 18, effectively halting an active military conflict that erupted on February 28.
The path to the armistice was highly volatile. Diplomatic delegations originally gathered directly in the Swiss resort city of Bürgenstock for face-to-face talks. However, the Iranian delegation abruptly walked out of the summit in protest following vehement threats from U.S. President Donald Trump, who publicly warned of devastating direct strikes on mainland Iran if Tehran didn’t acquiesce.
Indirect Diplomacy Prevails: Despite the theatrical collapse of direct talks, regional broadcasters, including Al Hadath, confirmed that communication never fully ceased. Backchannel negotiations continued intensely through international intermediaries.
According to reports by Axios, despite the early walkouts and explosive rhetoric, all mediating parties expressed deep satisfaction with the final structural progress of the framework, which successfully neutralized an active theater of war.
