Hegseth Reveals Iran War Has Cost an Estimated $37.5B as Senators Question What Has Actually Been Spent

The most important detail in Defense Secretary Pete Hegseth’s new estimate for the Iran war may not be the staggering dollar amount. It may be the fact that part of the money has not been spent yet.

Hegseth told senators today, Tuesday, July 21, 2026, that the conflict has cost an estimated $37.5 billion in military costs. But under questioning from Illinois Democratic Sen. Dick Durbin, he acknowledged that the figure combines expenses already incurred with projected military pay, operations and maintenance costs through the end of the federal fiscal year on September 30.

That distinction turns the number into more than a receipt from the battlefield. It is also a preview of what the Pentagon expects the war to continue costing over the next several weeks.

The $37.5 Billion Figure Is Part Bill, Part Forecast

Durbin repeatedly pressed Hegseth to explain exactly what the new figure represented.

“Some of that number captures additional O&M, military pay and other costs that would be anticipated through the fiscal year,” Hegseth said.

“So some of that anticipates what costs would be going out in the future as well.”

Durbin then asked for the updated total.

“So the new number you’ve given me is what?” he asked.

“$37.5 billion,” Hegseth replied.

When Durbin asked what period the estimate covered, Hegseth said it included certain expenses through the present day, along with military pay, operations and maintenance, and other anticipated costs through September 30.

The exchange revealed an important layer that could easily be lost beneath the headline. The Pentagon is not saying every dollar has already left the Treasury. Instead, officials appear to be combining immediate war costs with expenses they believe will become necessary before the fiscal year closes.

The department has not publicly provided a detailed breakdown showing how much of the $37.5 billion has already been spent, how much has been obligated under contracts and how much remains projected. Reuters reported that it remained unclear how the Pentagon calculated the figure.

The Cost Has Climbed by Nearly $8 Billion

The new estimate is almost $8 billion higher than the Pentagon’s previous publicly disclosed figure, showing how quickly the financial demands of the conflict have grown.

In May, the war was estimated to have cost nearly $29 billion. The latest figure pushes the price tag significantly higher even before the fiscal year ends and before lawmakers know how long the current phase of operations will continue.

That rapid increase gives the hearing a different meaning. Hegseth was not simply updating Congress on spending that had already occurred. He was attempting to convince lawmakers that the military needs another major injection of money to prevent shortages and protect its ability to train, maintain equipment and continue operations.

“Without these funds, we face critical shortfalls,” Hegseth told the committee.

He also warned that military training could be reduced if Congress does not provide additional funding. That possibility brings the war’s impact closer to bases, training ranges and military communities across the United States, even though the combat operations are taking place thousands of miles away.

An Overseas War Is Becoming a Domestic Budget Fight

The Pentagon’s cost estimate includes more than missiles, aircraft missions and battlefield operations.

Operations and maintenance spending can cover equipment repairs, transportation, fuel, logistics, facilities and the daily expenses required to keep military units prepared. Military pay adds another layer, particularly when additional personnel are deployed or kept on extended assignments.

That means the financial effects of the Iran war can reach installations and defense operations throughout the country. A funding shortage may not immediately stop combat missions, but it could force military leaders to delay training, postpone maintenance, or move money away from other priorities.

The Trump administration requested approximately $87.6 billion in supplemental funding, with much of the request connected to the Iran conflict and other Pentagon needs. Republicans are also preparing a broader budget package of roughly $95 billion that includes military funding alongside farm assistance and proposed voting law changes.

The debate is therefore no longer limited to whether military operations should continue. Lawmakers must also decide how much money to provide, where it should come from, and whether the Pentagon has clearly explained how previous funding has been used.

Senators Question Why More Money Is Needed Now

New Hampshire Sen. Jeanne Shaheen challenged Hegseth over the department’s request for additional money when roughly $75 billion from an earlier $150 billion military package had not yet been spent.

“If you still have $75 billion available, why are you asking the American people to absorb the cost of a war they don’t support?” Shaheen asked.

Hegseth responded that the remaining funding was expected to be spent by September, once again placing the end of the fiscal year at the center of the Pentagon’s argument.

Sen. Patty Murray of Washington, the committee’s leading Democrat, accused the administration of allowing the conflict to spiral and warned against the possibility of another prolonged war. Republicans, meanwhile, have generally supported providing the military with the resources needed to sustain operations, although some conservatives have raised concerns about approving more spending without corresponding budget cuts.

The financial debate comes alongside the human cost. Seventeen American service members have been killed during the conflict, and hundreds have been injured since fighting began earlier in 2026.

Those casualties ensure that the discussion cannot be reduced to an accounting exercise. Each new funding request is connected to military personnel already serving in a dangerous and rapidly changing conflict.

The Next Cost Estimate Could Be Even More Important

Hegseth’s testimony provided Congress with a number, but it did not deliver a final bill. The $37.5 billion estimate only accounts for anticipated expenses through September 30. If major operations continue into the next fiscal year, lawmakers could face additional funding requests, especially if the military must replace weapons, repair equipment and rebuild depleted stockpiles.

That is the real significance of the figure revealed during Tuesday’s hearing. It tells Americans something about what the war has cost, but it may reveal even more about what the Pentagon expects to spend next.

For now, $37.5 billion is the administration’s public estimate. But because the number includes both completed expenses and projected costs, it should be understood as a moving target rather than the war’s final price tag.

The question hanging over Congress is no longer simply how much the Iran war has cost. It is how much more the country is being asked to commit before anyone can say when the spending will stop.