US Borrowing Costs Inch Higher as Energy Crisis Tests Fed Resolve

The government’s average borrowing rate crept up to 3.41% in May, a modest 0.01 percentage point increase from April but part of a steady climb that has pushed Treasury rates 10 basis points higher over the past year. It’s a small move in isolation, but it reflects the broader recalibration happening across bond markets as energy inflation reshapes the Fed’s calculus.

The uptick comes as the Strait of Hormuz closure continues to scramble monetary policy assumptions. With oil trading near $95, up from $66 before the crisis, the Fed has already paused its easing cycle, and bond investors are demanding higher compensation for inflation risk. Treasury rates may seem stable at 3.4%, but they’re moving in the wrong direction for a government carrying $34 trillion in debt. Every tenth of a percentage point adds billions to annual interest expense.

This gradual rise in government borrowing costs mirrors what’s happening across the yield curve. When the Fed holds rates steady while energy prices spike, longer-term bonds bear the inflation uncertainty. The 3.14% year-over-year increase in Treasury rates suggests investors are pricing in a higher-for-longer environment, a marked shift from the rate-cutting expectations that dominated late 2025.

Historically, when government borrowing costs rise alongside energy shocks, it signals tightening financial conditions that eventually work their way through the broader economy. Corporate borrowers typically face even steeper increases, as credit spreads widen when Treasury rates climb. Past energy crises have shown that rising government funding costs often precede broader credit tightening, particularly for lower-rated borrowers.

Bottom Line: Government borrowing costs are drifting higher as energy inflation forces a policy rethink, a reminder that even modest rate increases compound quickly when applied to trillions in outstanding debt.

Source: US Treasury Fiscal Data

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