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- U.S. Treasury yields climbed as inflation, oil prices, and Iran risks strained markets.
- The 30-year yield crossed 5.18% as the 10-year yield advanced toward the 4.68% mark.
- Rising debt and deficits pushed borrowing costs higher for mortgages and consumers.
U.S. Treasury yields continued to climb in May as investors followed inflation, energy costs, fiscal deficits, and Iran shipping risks. The action raised the cost of long-term borrowing, adding renewed pressure on bonds, mortgages, and financial markets throughout the United States.
The 30-year Treasury yield climbed above 5.18%, its highest level since 2007. The 10-year Treasury yield was climbing toward 4.68% as it climbed some 75 basis points in less than three months.
U.S. Treasury Yields Rebound From Pandemic-Era Lows
The U.S. Treasury yields experienced a dramatic turnaround from the unprecedented lows during the pandemic era. After remaining under 5% for the majority of the last 20 years, the 30-year yield climbed to 5.184% on May 19, 2026.
As per the data, in the pandemic shock of 2020, the yields of the Treasury had already dipped below 1.5%. They have since picked up from 2022 to 2026, amid inflation expectations and higher government borrowing.
The 10-year note yield earlier in 2026 had been down to 3.92%. Until inflation and geopolitical risks made a change, markets were anticipating a number of Federal Reserve rate cuts.
Higher energy costs and a return of inflation pressure continued to support U.S. Treasury yields. Shipping traffic was kept near zero as disruptions were reported in connection with the Iran conflict and the closure of the Strait of Hormuz.
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Oil Prices and Debt Growth Add Market Pressure
Crude prices remained above $100 a barrel for almost two months. Jet fuel prices jumped 58%, gasoline prices jumped 52%, and fertilizer climbed 20% during that time.
Inflation data also indicated higher price pressure. The U.S. producer price inflation reportedly increased to 6.0%, and consumer inflation jumped to 3.8%, the highest level since 2023.
The debt markets were further strained by increases in the federal borrowing requirement. The U.S. budget deficit reportedly reached $1.2 trillion in the first six months of fiscal year 2026.
The overall national debt also rose to a record $39 trillion. That rise brought with it added worries as investors wanted to be paid higher to hold long-term government debt.
Consumer borrowing costs also were influenced by higher U.S. Treasury yields. The average 30-year fixed-mortgage rate jumped to 6.68%, down from rates under 6% that prevailed before the Iran war.
