US Military Budget Expansion and Iran Conflict Impact Rates and Inflation

The U.S. military budget is set for a historic expansion, with the administration seeking a $1.5 trillion allocation for fiscal year 2027. This proposal, which would mark a $600 billion increase over the final budget of the Biden administration, represents a surge of nearly 2.0% of GDP, according to reporting from Inter Press Service.

The push for increased defense spending follows the February 28, 2026, military engagement in Iran. Before that conflict, the interest rate on 10-year U.S. Treasury bonds sat at approximately 4.0%. By late August, that figure had climbed to 4.7%, a trend that has since raised borrowing costs for both government and private sectors, Global Issues reported.

Economist Jomo Kwame Sundaram, writing for Inter Press Service, noted that the administration may attempt to bypass congressional approval for additional war funding, potentially leveraging the authority of the chief of staff to circumvent the constitutional requirement that Congress alone holds the power to tax and spend. Without a corresponding increase in taxes, such spending would likely necessitate a significant expansion of the federal deficit, further pressuring interest rates.

The Federal Reserve has maintained a hawkish stance despite the ongoing economic strain. While the Fed lowered interest rates in 2024 as unemployment figures rose, it has resisted calls to cut them further following the recent election. Kevin Warsh, appointed by the president to lead the central bank, has not yet shifted to a lower-interest-rate policy. Projections from the Federal Reserve indicate that the Fed funds rate will remain elevated through 2027 and 2028 compared to pre-war levels.

The economic fallout has been felt acutely in consumer markets. Fuel prices surged by $1.50 per gallon immediately following the start of hostilities and remain significantly higher than their early 2026 baseline. Diesel costs, which peaked at nearly $3 above pre-war levels, continue to impact supply chains and logistics. Food security is also a point of concern for the coming year, as fertilizer shortages are expected to intensify due to disruptions in supply from the Persian Gulf.

Despite the administration’s reliance on tariffs and sanctions, these measures have faced criticism for exacerbating inflation. While the removal of the April 2025 “Liberation Day” tariffs did not result in a return to lower price levels, the current inflationary climate remains tied to the uncertainty of the conflict.

As the war continues, the global interest rate landscape remains unsettled, with long-term debt costs rising across international markets. The Federal Reserve’s next policy decision remains pending, with market observers looking toward the 2027 fiscal year to see if the proposed $1.5 trillion military budget will be enacted.

More on Iran Conflict: US-Iran Conflict: Trump Warns of Destruction as Qeshm Island Hit