While currently unattractive, a future, inevitable credit spread widening event (e.g., IG to 165-185 bps, HY to 600-800 bps) will kick off a five-to-ten-year 'golden age' for credit, where corporate bond returns could rival or even outperform equity markets.
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A surge in corporate spending on AI, capex, and M&A can boost stock prices. However, this same activity often requires issuing large amounts of new debt, increasing supply and causing credit spreads to widen, leading to underperformance versus equities.
Despite tight spreads signaling caution, the current market is not yet cracking. Parallels to 1997-98 and 2005—periods with similar capex, M&A, and interest rates—suggest a stimulative backdrop and a major tech investment cycle (AI) will fuel more corporate aggression before the cycle ultimately ends.
Morgan Stanley predicts the AI investment cycle, plus M&A and capex, will drive a 60% surge in U.S. investment-grade bond issuance in 2026. This massive supply increase is expected to push U.S. credit spreads wider, even if the underlying economy remains healthy and demand is strong.
Counterintuitively, high-yield corporate bonds are expected to perform better than investment-grade credit. They do not face the same supply headwind from AI-related debt issuance, and their fundamentals are supported by credit team forecasts of declining default rates over the next 12 months.
The massive ~$1.5 trillion in debt financing required for AI infrastructure will create a supply glut in the investment-grade (IG) bond market. This technical pressure, despite solid company fundamentals, makes IG bonds less attractive. High-yield (HY) bonds are favored as they don't face this supply headwind and default rates are expected to fall.
A primary market risk is a sudden stop in the AI investment cycle. While this would clearly pressure equities, it could counter-intuitively benefit investment-grade credit by reducing new bond issuance—the main factor forecast to widen spreads.
With credit curves already steep and the U.S. Treasury curve expected to steepen further, the optimal risk-reward in corporate bonds lies in the 5 to 10-year maturity range. This specific positioning in both U.S. and European markets is key to capturing value from 'carry and roll down' dynamics.
Despite forecasting a massive surge in bond issuance to fund AI and M&A, Morgan Stanley expects credit spreads to widen only modestly. This is because high-quality, highly-rated companies will lead the issuance, and continued demand from yield-focused buyers should help anchor spreads.
Barclays forecasts a 40% jump in net investment-grade debt supply in 2026, driven by tech sector CapEx and renewed M&A activity. This massive influx of new bonds will test market demand and could lead to wider credit spreads, even if economic fundamentals remain stable.
The gap between high-yield and investment-grade credit is shrinking. The average high-yield rating is now BB, while investment-grade is BBB—the closest they've ever been. This fundamental convergence in quality helps explain why the yield spread between the two asset classes is also at a historical low, reflecting market efficiency rather than just irrational exuberance.