President Donald Trump’s ongoing military engagement in Iran is starting to show tangible repercussions in the world of U.S. debt markets, as investor confidence in Treasury securities diminishes amid uncertainty surrounding the conflict. This past week’s auctions for two-, five-, and seven-year Treasury notes experienced remarkably weak demand, resulting in yields climbing higher than analysts originally anticipated. This represents a significant shift compared to the previous month, when a Treasury offering garnered the highest demand observed in the history of 30-year auctions.
The short end of the yield curve is feeling heightened pressure, especially due to soaring oil prices that are exacerbating inflation expectations and stalling further rate cuts by the Federal Reserve. Simultaneously, the likelihood of an interest rate hike has increased.
Compounding these issues, reports have emerged indicating that the Pentagon is seeking an allocation of $200 billion from Congress to fund military operations. The costs associated with the conflict have already led to significant depletion of essential munitions and the destruction of U.S. military resources such as aircraft, radar systems, and bases due to Iranian actions.
RSM Chief Economist Joseph Brusuelas commented on the situation, noting, “The U.S. Treasury bond market has finally responded to the Mideast war, giving its assessment of the energy shock’s severity and the war’s effect on U.S. fiscal imbalance and inflation.” He also pointed out a marked increase in bond market volatility and a growing risk premium associated with purchasing Treasuries. As the 2-year yield surpassed 4.0% and the 10-year yield climbed over 4.4% this week, it becomes clear that investor apprehensions are on the rise.
The MOVE index, which measures fluctuations in the Treasury market, has surged to levels indicative of price instability and policy dysfunction. If such uncertainty persists, it may lead to larger funding pressures within debt markets that are already facing challenges due to concerns surrounding private credit.
The dilemma also brings to the fore the term “bond vigilantes,” used to describe market players who challenge excessive government borrowing by offloading bonds, which in turn drives yields higher. Historically, significant sell-offs have influenced presidential decisions, as seen with Trump’s retreat from his trade war last year after the bond market experienced distress. With the U.S. now engaged in active military conflict, these vigilantes could exert similar pressures.
Brusuelas further illuminated the situation by asserting that the need for additional expenditures related to the war could inflate U.S. debt levels, triggering a sell-off in the bond market as investors seek higher yields to offset perceived risks. This dynamic would ultimately affect long-term rates, including 30-year mortgage rates that are partially based on benchmark 10-year yields.
As the Iranian conflict stretches into its fifth week, analysts warn that it could potentially extend into the fall or even next year, exacerbating the situation. Iranian alliances in Iraq and Yemen are complicating matters further, and tensions mount as Gulf neighbors contemplate direct military action against the regime, which is targeting their economic assets.
Additionally, thousands of U.S. Marines and paratroopers are being deployed to the Middle East, with talks of sending another 10,000 troops for a possible ground operation in Iran aimed at reopening the vital Strait of Hormuz.
In the context of a prolonged conflict alongside burgeoning borrowing costs, the federal government faces a daunting challenge with $10 trillion of debt set to mature in the next 12 months. Simultaneously, the budget deficit is projected to reach $2 trillion. Apollo Chief Economist Torsten Slok has observed that increasing competition for investors’ funds, especially from the corporate sector, could further complicate the borrowing environment for the administration.
He emphasized that corporate debt issuance is expected to surge, with total gross corporate bond issuance in 2026 potentially reaching around $2 trillion. The extensive supply of investment-grade bonds hitting the market this year is estimated around $14 trillion, contributing to upward pressure on rates and credit spreads. The overarching consequence of these developments signals complex challenges ahead for U.S. fiscal policy and economic stability as the ramifications of the war unfold.
