Credit roll-down strategy gains traction
Investors seeking steady returns in corporate bonds may find the best opportunity in the middle of the yield curve—between two and seven years to maturity.
How “rolldown” works in credit markets
Rolldown refers to how a bond’s yield usually decreases as it approaches maturity in an upward-sloping yield curve. This decline raises the bond’s price, even if market conditions remain unchanged. The effect is well-known in government debt, where the three-to-five-year segment has historically been the most favorable.
Analysis of two decades of bond-level index data from the U.S., Europe, and the U.K. indicates this principle also applies to corporate bonds, though the optimal maturity range adjusts slightly. The study isolated the credit spread—the additional yield investors earn for holding corporate debt over government bonds—and observed how it narrowed as bonds aged.
Their metric, “spread roll-down efficiency per duration,” calculates the monthly return from spread tightening divided by the bond’s interest-rate risk. It measures how much extra yield an investor gains for each unit of risk taken.
Outcomes differed by currency and credit rating, but a clear trend emerged. In sterling, the highest efficiency appeared in four-to-five-year BBB-rated bonds. Euro-denominated debt performed best in the two-to-three-year segment, with single-B and lower-investment-grade bonds offering the strongest trade-off. U.S. dollar bonds fell within the two-to-six-year range, where single-B to BBB+ ratings led.
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Annualized monthly roll-down returns across maturity buckets and credit ratings were tracked using end-of-month data from July 2006 to May 2026.
M&G and IBoxx Corporate indices provided the data.
One limitation: longer-dated bonds don’t capture rolldown as effectively, but they can still produce higher returns if an investor accurately forecasts credit quality or interest-rate changes. Rolldown isn’t the only factor, but it remains the most predictable.
The results show that the so-called “free lunch” of fixed income isn’t exclusive to government bonds. Corporate debt provides its own version, and the approach works similarly across major markets.
This consistency may be the most practical insight. Investors can target the same maturity window whether they’re purchasing bonds in New York, Frankfurt, or London. The specifics vary, but the underlying principle stays the same.
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These bonds occupy an ideal position: long enough to benefit from spread tightening, yet short enough to avoid the volatility of longer-dated debt.
For fund managers, this could mean shifting resources toward intermediate maturities, particularly in lower-rated investment-grade and high-yield bonds. The study excluded U.K. high-yield debt due to its smaller market size, but the U.S. and European findings were strong enough to indicate the effect isn’t random.
Rolldown isn’t foolproof. A flattening or inverted yield curve would disrupt the calculations, and credit spreads can widen unexpectedly. Over two decades, however, the pattern remained stable—enough to make it a reasonable foundation for portfolio construction.
The next economic downturn will reveal whether the middle of the curve continues to outperform.
