Iran War Cost Hits $43.6 Billion as Bills Keep Rising

The Iran war cost to the U.S. military has climbed to $43.6 billion as of September 3, according to a U.S. Central Command estimate shared with lawmakers and reported by the Associated Press and Bloomberg. That makes the conflict, launched by the United States and Israel on February 28, one of the fastest-growing military bills in recent U.S. history.

The new figure updates an earlier assessment from the nonpartisan Congressional Budget Office (CBO), which reported on September 15 that the war had cost the Department of Defense about $38 billion through August 1, according to the CBO report summarized by multiple outlets.

Iran War Cost: Where the Money Is Going

The largest single driver of the Iran war cost is replacing expended munitions. The CBO put the cost of replacing weapons used through August 1 at $21.7 billion. In the Central Command estimate just over a month later, weapons costs had jumped to $28.1 billion — an increase of more than $6 billion in about five weeks, according to the AP breakdown reported by Haaretz.

Other major components include increased flying hours, higher fuel costs, equipment lost in battle and the cost of sustaining deployed forces, the CBO said. The budget office also warned that the main opportunity cost has been the depletion of missile defense interceptors: comparing reported use with total purchases, the CBO estimated the United States has probably used between one-half and two-thirds of its interceptor inventory since June 2025.

• Total through Sept. 3: $43.6 billion (Central Command estimate)
• Through Aug. 1: $38 billion (CBO)
• Munitions replacement: $28.1 billion and rising
• Monthly burn rate: about $2-3 billion, depending on intensity
• War start: February 28, 2026

How Fast the Bill Is Growing

The CBO estimated each additional month of fighting would cost roughly $2 billion if violence stays at the lower levels seen in May and June, or about $3 billion if it returns to July’s intensity — and potentially more if the conflict escalates. Defense Secretary Pete Hegseth estimated in July that the war had cost $37.5 billion, a figure the CBO’s analysis largely aligned with, according to Republica’s summary of the report.

The rising estimates arrive as the administration pushes major new military funding. In June, it requested an additional $67.1 billion in supplemental military spending; the CBO found only $42.3 billion of that appeared directly related to the war, according to analysis by Taxpayers for Common Sense. The White House is also asking Congress to approve a $95 billion package tied to the war and other priorities, alongside a proposed $1.5 trillion military budget, Haaretz reported.

What the Estimates Leave Out

Analysts caution that the official figures understate the full taxpayer exposure. The CBO noted its estimate carries considerable uncertainty because the Defense Department did not respond to its requests for information, forcing reliance on government databases and public reports, The Economic Times summarized. Excluded or uncounted items include damage to U.S. military bases, some lost equipment already slated for replacement, diplomatic and foreign aid costs, and long-term veterans’ disability and health care, according to Taxpayers for Common Sense.

Outside estimates have run far higher: one in-depth report in May placed the cost of the war’s first 60 days alone at nearly $72 billion under a broader accounting, the same analysis noted.

The Wider Economic Price

Beyond the Pentagon’s ledger, the CBO said the conflict’s main effect on the U.S. economy has been inflationary pressure from disrupted oil and natural gas shipments through the Strait of Hormuz and shipping problems in the Red Sea. The agency estimated the war could make inflation roughly 0.5 percentage points higher in the first quarter of 2027 than previously projected, Republica reported.

The Political Fight Ahead

The CBO analysis was prepared at the request of Representative Brendan Boyle, the top Democrat on the House Budget Committee, and other Democratic lawmakers. Boyle said the report shows the war has cost taxpayers tens of billions and continues to drive up costs, according to Republica.

With November’s midterm elections approaching, the financial and human costs of the war are expected to feature in the congressional debate over the administration’s funding requests, Haaretz reported. For now, the meter keeps running at up to $3 billion a month.