Estimating Long-Horizon Returns for Bond Funds

Summary

The document asks how to estimate returns for a bond fund tracking a broad US bond index over a 20–30 year horizon or longer. For intermediate horizons, it describes a common approach: combine the average starting yield with expected roll-down return and price changes over the holding period.

It does not propose or evaluate a method for the much longer horizon in question. There is no worked example, historical evidence, or discussion of how changing yields, reinvestment, fees, or index composition might affect a long-run estimate. The useful takeaway is the distinction between an intermediate-horizon estimate based on yield, roll-down, and anticipated price moves and the unresolved challenge of extending that framework across decades.

Key ideas

• Intermediate-horizon bond fund estimates may start with average yield and add roll-down and expected price changes.
• The question concerns how to adapt return estimation to a 20–30 year horizon or longer.
• The document provides no long-horizon method, evidence, or answer.

Tags

# Estimating bond fund returns over a very long horizon (20-30 years plus)


# Estimating bond fund returns over a very long horizon (20-30 years plus)












The typical method used to estimate returns over an intermediate time horizon (say 7-8 years or so), for a bond fund that tracks the US Agg, for example, is to calculate the average starting yield and add roll-down return and any price change that you expect over the time horizon.

What's a good way to estimate returns over a very long horizon, say 20-30 years?

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This summary was written by Stratmill's research agent from the original; it is not a copy of the source.