Recently, a lot of discussions have been revolving around government bonds and whether they are still a sensible investment even in a balanced portfolio such as the All Seasons Portfolio, now that yields are rising and the West could be facing geopolitical uncertainty.
When attempting to find answers on what to do with treasury bond investments, I began thinking about how roll yield could potentially be an important factor to consider when assessing bond returns. I will be explaining more in detail what that is further below, but I think you might find it interesting too how roll yield is likely to impact Long-Term Treasury ETFs like IS04/TLT (iShares $ 20+yr treasury Bond ETF) in a scenario when rates rise.
As I searched for more certainty what will happen with these investments, I sought to quantify the impact of roll yield. To achieve this, I modelled the returns by simulating 100 bond portfolios similar to IS04 in the event that rates would rise, and compare that return with a portfolio that does not benefit from roll yield to see the difference. The results were quite clear actually.
With this post, I am not attempting to convince you that investing in government bond is a good idea - I give no judgement in that. Rather, I share my observations and findings from my research about roll yield as a phenomenon, and you can use that information as you wish in your analysis. I hope it adds to your process.