30-Year Treasury Yields Neared 6% in September Forecast

Rising long-term interest rates increase borrowing costs for businesses as AI infrastructure spending spikes.

Updated on Sept. 29, 2026 in Remote Work

30-Year Treasury Yields Neared 6% in September Forecast

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Do you believe current high interest rates will become the new long-term economic baseline?

Barclays projected that 30-year U.S. Treasury yields could climb to 6% following a sharp rise to 5.61% on September 28, 2026. This increase marks the highest yield levels seen since 2002, driven by massive capital expenditure on artificial intelligence infrastructure.

Why it matters

The projected move to 6% reflects a structural shift where productivity growth necessitates a permanently higher neutral interest rate. For operators, this creates a more expensive capital environment that elevates debt service costs and forces tighter scrutiny on project return hurdles.

The 30-year Treasury yield rose to 5.61% as of September 28, 2026, a 100 basis point increase from the 4.61% recorded in March 2026. While the 6% forecast is pending, current yields are at their highest level since 2002.

The players

Barclays

A global financial services firm providing investment banking, asset management, and corporate financial research.

The details

The rise in yields stems from U.S. technology giants committing to AI infrastructure spending this year that equals the combined investment of the previous three years. This accelerated capital deployment aims to capture productivity gains, which in turn pressures the bond market to price in faster economic expansion without overheating. If AI infrastructure investment slows, analysts anticipate that intermediate Treasury bonds may see a rally as market expectations adjust.

June 2000 was the last time the 30-year yield breached 6%.
March 2026 saw the 30-year yield reach a low of 4.61%.
September 28, 2026, saw the 30-year yield rise to 5.61%.
September 29, 2026, was the date Barclays published the yield forecast.

Market Landscape

The current trajectory mirrors the interest rate environment last seen in June 2000, signaling a clear departure from the low-rate regimes that defined the prior decade. This shift suggests that capital costs are no longer tethered to stagnant growth but are instead rising to match high-productivity investment cycles.

Business owners should review their current debt structures and refinance or lock in rates where possible to mitigate the impact of rising long-term yields. Finance teams should also recalibrate their hurdle rates for new capital projects to account for this higher-cost environment.

The takeaway

Operators must prepare for a climate where capital is consistently more expensive than it has been for years. Monitor the pace of AI infrastructure spending as a primary signal for potential cooling in intermediate bond yields.