The US‑Iran war has already cost the Pentagon roughly $38 billion and could add $2‑3 billion each month while fighting continues
Executive summary: The US Department of Defense has incurred approximately $38 billion in costs related to the war with Iran as of August 1, 2026, with an estimated additional $2‑3 billion per month if the conflict persists. These figures directly affect the US fiscal outlook, elevate defense spending, and contribute to upward pressure on global oil prices, which in turn influences energy, transportation and broader business costs.
Who is involved: Primary actors are the United States Department of Defense, the Iranian government, and indirectly oil markets and related industries.
Likely next: Continued hostilities will sustain the monthly cost accrual, while any de‑escalation or cease‑fire could reduce the incremental spending rate.
According to an analysis published by Expansión, the Department of Defense has spent about $38 billion through August 1, 2026, with the conflict projected to add $2‑3 billion per month. This ongoing expenditure strains the federal budget and ties military spending to the trajectory of the Middle East hostilities.
What's next — scenarios
Protracted Low-Intensity Conflict (60%)
Defense contractors will see steady, predictable revenue streams, but broader tech and consumer sectors face persistent fiscal drag and inflation pressures.
- Monthly Pentagon expenditures remain strictly within the $2-3 billion range
- Diplomatic talks stall without escalating to regional war
Sudden Military Escalation (25%)
Supply chain disruptions and oil price spikes will force businesses to immediately hedge input costs and re-evaluate logistics in the Middle East.
- Direct kinetic strikes on critical energy infrastructure in the Gulf
- Emergency supplemental defense spending bill exceeding $10 billion requested by the Pentagon
Rapid Diplomatic Breakthrough (15%)
A sharp reduction in defense outlays will trigger short-term volatility in defense stocks and a slight relief rally in broader markets due to easing fiscal deficit fears.
- Formal ceasefire agreement mediated by international third parties
- Significant drawdown of US naval assets from the region
What to watch
- Monthly Department of Defense expenditure reports on Middle East operations over the next 30 days
- Congressional debates on upcoming defense appropriations bills through Q3 2026
- OPEC+ production quota adjustments and oil price volatility over the next 60 days
Timeline
- — La guerra con Irán cuesta a EEUU unos 38.000 millones de dólares (Expansión)
- — El petróleo sube un 4% y toca los 94 dólares tras los últimos ataques de EEUU a Irán (Expansión)
- — EEUU e Irán reanudan los ataques en el estrecho de Ormuz tras un mes de tregua (Expansión)
- — Operación Paria Económico: así es el plan de EEUU contra Irán que ha puesto en alerta a China (Expansión)
- — China advierte a EEUU que podría tomar represalias por las sanciones a Irán (Expansión)
Analysis — what this means
Sectors affected
- Defense contracting
- Oil & gas exploration
- Refining and petrochemicals
- Transportation and logistics
Historical parallels
- US attacks on Iran in early September 2026 drove Brent crude up 4% to $94 per barrel (Expansión, 2026‑09‑01)
- US and Iran resumed attacks in the Strait of Hormuz on August 31, 2026 (Expansión, 2026‑08‑31)
- Operación Paria Económico plan announced by the United States on August 26, 2026 targeting Iran (Expansión, 2026‑08‑26)
- China warned the United States on August 25, 2026 that it could take retaliatory measures over Iran sanctions (Expansión, 2026‑08‑25)
Key entities
Sources
- La guerra con Irán cuesta a EEUU unos 38.000 millones de dólares — Expansión
- El petróleo sube un 4% y toca los 94 dólares tras los últimos ataques de EEUU a Irán — Expansión
- EEUU e Irán reanudan los ataques en el estrecho de Ormuz tras un mes de tregua — Expansión
- Operación Paria Económico: así es el plan de EEUU contra Irán que ha puesto en alerta a China — Expansión
- China advierte a EEUU que podría tomar represalias por las sanciones a Irán — Expansión
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