The 10-year U.S. Treasury yield topped 5% this past week, reaching its highest level since 2007. This surge has completely dismantled the long-term borrowing cost forecasts issued by the Congressional Budget Office (CBO), alarming experts who previously downplayed concerns regarding the national debt.
Forecasts Blown Out of the Water
According to the CBO’s outlook from February — published before the war in Iran spiked oil prices and inflation expectations — the benchmark yield was projected to be 4.1% this year and 4.2% in 2027. Instead, the yield has jumped a full percentage point since late February, rendering previous fiscal models obsolete.
Multiple Pressures on Yields
While an end to the war in Iran could provide relief, other structural factors are driving yields higher:
- A massive $40 trillion national debt and annual budget deficits of $2 trillion.
- Increased competition for investor capital from other indebted nations and AI hyperscalers.
- A geopolitical environment where shocks are now viewed as a permanent feature of a less stable world.
The Threat of a Debt Spiral
The Committee for a Responsible Federal Budget (CRFB) estimates that if yields remain 80 basis points above baseline projections, the U.S. will spend $2.7 trillion annually on interest payments by 2030. This figure would surpass spending on Medicare or Social Security retirement benefits.
“If interest begets debt, and debt begets interest, eventually debt will spin out of control. A fiscal crisis, once unthinkable, is now a distinct possibility,” said Maya MacGuineas, president of the CFRB.
Even veteran market analyst Ed Yardeni, known for his "bond vigilante" theory, admitted he is starting to worry as the 10-year yield breaks above 5%. Similarly, Jared Bernstein, former chair of the Council of Economic Advisers, noted in an op-ed that while he was not an alarmist for years, the current rate of deterioration has changed the math significantly.
