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CBO puts five years on rebuilding what five months of war with Iran consumed
The Congressional Budget Office counts about $38bn of additional Pentagon spending in five months, $21.7bn of it replacing spent munitions, and says returning inventories to their previous levels takes at least five years.
The Investor · Invest desk
What happened
- The Congressional Budget Office estimates the Defense Department spent about $38bn in additional costs between February 28, when the war with Iran began, and the first day of last month.
- Replacing spent munitions accounts for $21.7bn of that total, or 57%, the largest single category in the estimate.
- The Wall Street Journal reported that U.S. forces recently expended 60 to 70 Patriot interceptors and more than 12 THAAD interceptors to stop roughly 20 Iranian ballistic missiles.
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Why it matters
- constraint A five-year restoration horizon caps how fast $21.7bn turns into deliveries: spread evenly it is about $4.3bn a year of replacement work, and the limit is production capacity, not appropriation.
- exposure With half to two-thirds of the interceptor stockpile gone since June 2025, less is available for a second contingency, and the Pentagon has not published an inventory count to check the estimate against.
- cost Households carry part of the bill through CBO's revised first-quarter forecast, which puts headline PCE inflation 0.5 points above the February path, 0.2 of it outside core.
Divide the $38bn the Congressional Budget Office counted by the five months it covers and the war has run at about $7.6bn a month [1][1]. The same assessment projects costs rising by about $2bn a month if fighting stays at the low intensity of May and June, and $3bn or more if it returns to July levels [3]. Read those as monthly run rates and the first five months went at roughly two and a half to nearly four times the pace now projected [6]. Either the opening phase was the expensive one, or the $38bn front-loaded a restock bill that gets paid slowly.
Munitions replacement is $21.7bn of the total and increased aircraft flight hours another $10.4bn, so two line items carry $32.1bn, about 85%, and leave roughly $5.9bn for everything else [2][4][2].
CBO says restoring depleted inventories to their previous levels alone could take at least five years [5]. Spread evenly, $21.7bn is about $4.3bn a year of replacement orders [3]. The report does not say whether that horizon comes from factory capacity or from the pace of contract awards, and the difference decides what the munitions suppliers can actually recognise: new lines and long-lead components in the first case, a queue of appropriated money in the second.
The consumption rate is what makes five years plausible. The Wall Street Journal reported that U.S. forces recently expended 60 to 70 Patriot interceptors and more than 12 Terminal High Altitude Area Defense interceptors to stop roughly 20 Iranian ballistic missiles [8]. At those counts each incoming missile absorbed between 3.6 and 4.1 interceptors, and more if the THAAD figure runs above 12 [4]. The Defense Department does not disclose how many interceptors it holds, though spending records and procurement history suggest between half and two-thirds of the stockpile has gone since June 2025 [6]. Sedaily reported that the drawdown erodes the ability of American forces to respond to a contingency such as a conflict over China and Taiwan [7].
The bill reaches consumers too. CBO expects personal consumption expenditures inflation in the first quarter of next year to run 0.5 percentage points above its February projection, with core PCE 0.3 points above [9]. Food and energy account for the 0.2-point difference [5].
The same day the cost estimate circulated, CBS published photographs from active-duty service members showing a Boeing E-3 Sentry at Prince Sultan Air Base in Saudi Arabia with its tail section blown off by a direct hit, and barracks at Camp Buehring in Kuwait stripped to their frames [10]. One active-duty service member told CBS that "this damage has not been made known to the American people" [11], and added, "We are essentially getting punched in the face with our eyes closed. All we are doing is watching the bases get destroyed." [12]
I'd expect the five-year figure, not the $38bn, to govern what suppliers book, because an appropriation can move in a quarter and an interceptor delivery cannot. A run of replacement awards with deliveries inside two years would show the constraint was contracting speed instead. The other break is a ceasefire that arrives before Congress funds the restock. Then the $21.7bn measures a gap that stays unfilled.
What to watch
- CBO's next cost update, and whether monthly additions land near the low-intensity path or nearer the first five months' pace.
- Any supplemental appropriation sized against the $21.7bn munitions gap, and how much of it is obligated inside this fiscal year.
- Saudi forces downed a Houthi drone aimed at Mecca and the crown prince agreed a joint Red Sea response with Egypt; a wider Gulf front is the route to July-level monthly costs.