The $1 Billion-a-Day War: Fiscal Strain of US-Israel Conflict with Iran
The United States, already facing a precarious fiscal situation with a national debt exceeding $38 trillion, is now grappling with the immense financial burden of its ongoing military involvement in the conflict with Iran. The war, initiated with a joint U.S.-Israel attack on Iran on February 28, 2026, is currently estimated to be costing nearly $1 billion per day, exacerbating existing economic vulnerabilities.
The Escalating Costs of Operation Epic Fury
According to the Center for Strategic and International Studies (CSIS), Operation Epic Fury is consuming approximately $891.4 million daily as reported by CNN. The initial 100 hours of the conflict alone amounted to a staggering $3.7 billion. These costs are driven by extensive air and naval deployments, with air operations costing $30 million per day and naval operations adding another $15 million. Maintaining an aircraft carrier strike group adds a further $6 million to the daily tally, while the deployment of stealth bombers, fighters, and tanker aircraft incurs millions more in expenses.
Kent Smetters, faculty director of the Penn Wharton Budget Model, projects that a two-month war could cost taxpayers up to $95 billion, contingent on troop deployments and munition replenishment.
A Preexisting Debt Crisis
These substantial military expenditures are compounding an already fragile fiscal landscape. Michael A. Peterson of the Peter G. Peterson Foundation cautioned in October 2025 that the national debt was growing at twice the rate observed since 2000. The U.S. Government is currently allocating nearly $1 trillion annually to interest payments alone, exceeding spending on both defense and Medicaid.
The fiscal strain is further intensified by a partial government shutdown, which adds billions in short-term costs and disrupts essential economic activity. Credit rating agencies have already downgraded the U.S.’s credit rating due to political gridlock and fiscal instability.
Global Economic Impacts: Oil Shock and Inflation
The conflict has triggered a significant oil shock, with oil prices experiencing extreme volatility. On March 3, 2026, oil briefly touched $120 per barrel before fluctuating in response to statements from the White House and Iran’s Revolutionary Guard. The effective closure of the Strait of Hormuz is disrupting 30% of the world’s oil consumption and 20% of global liquefied natural gas supplies.
Economic Scenarios and Projections
Morgan Stanley chief economist Michael Gapen projects that, in an optimistic scenario where the conflict resolves quickly without lasting damage to energy infrastructure, oil prices will temporarily hover around $100 per barrel. This would result in a transitory increase in headline inflation of roughly 35 basis points for a few months, with limited impact on core inflation. However, the Federal Reserve would likely delay anticipated interest rate cuts.
A more severe scenario, involving a prolonged conflict lasting several months, could notice oil prices surge to $130 per barrel. Morgan Stanley estimates that a doubling of oil prices over a year could reduce U.S. Real GDP growth by 1.5%. This scenario would create a significant “uncertainty shock,” hindering business investment, slowing hiring, and prompting households to curtail spending. The Federal Reserve might then be compelled to abandon its inflation fight and aggressively cut rates to stabilize economic activity.
Apollo Global Management chief economist Torsten Slok likewise modeled both transitory and persistent shock scenarios. He projected a 0.5% increase in headline inflation and a 0.1% drag on GDP in the first quarter for either case. However, the transitory shock would dissipate by the third quarter of 2026, while the persistent shock could be felt through the end of 2027.
Market Sentiment and Future Outlook
Financial markets currently exhibit some insulation, largely due to the belief that President Trump’s sensitivity to market downturns will prevent a protracted conflict. However, as the national debt continues to escalate and military operations persist, the U.S. Economy faces a precarious balancing act in the months ahead.
For this story, Fortune journalists used generative AI as a research tool. An editor verified the accuracy of the information before publishing.