The Role of Bonds in a Portfolio: Shock Absorber and Decorrelation
Government bonds have traditionally played a key role in diversifying an investment portfolio. Their primary function is to act as a shock absorber during periods of equity market volatility, thanks to a historically negative or low correlation with equity markets. This decorrelation helps reduce the overall portfolio volatility and provides a steady income through coupons. However, 2022 highlighted the limitations of this approach: with the rapid rise in interest rates, bonds suffered significant losses, calling into question their role as a safe haven asset.
In 2022, the U.S. bond index iShares 20+ Year Treasury Bond ETF (TLT, ISIN US4642874329) fell nearly 31%, while the European ETF iShares Core Euro Aggregate Bond (IEAG, IE00B3F81R35) lost about 18%. This major correction was linked to rising rates that penalized the value of long-duration bonds, highlighting the interest rate risk often underestimated by investors.
Overview of IEAG and XGLE ETFs: Focus on Eurozone Government Bonds
For French investors looking to gain exposure to eurozone government bonds, two ETFs stand out due to their size, liquidity, and quality of management:
iShares Core Euro Aggregate Bond UCITS ETF (IEAG, ISIN IE00B3F81R35): This ETF tracks the Bloomberg Euro Aggregate Bond index, offering diversified exposure to euro-denominated investment grade bonds, including sovereign, supranational, and corporate bonds. The TER is particularly competitive at 0.10% per year.
Xtrackers Eurozone Government Bond UCITS ETF (XGLE, ISIN LU0290355717): This ETF focuses exclusively on eurozone government bonds, reflecting the Markit iBoxx EUR Eurozone Sovereigns index. It offers more targeted exposure to sovereigns, with a TER around 0.15%.
Both ETFs are eligible for the PEA (Plan d'Ăpargne en Actions), which is an important tax advantage for French investors.
Duration: Understanding Interest Rate Sensitivity
Duration is a key metric to measure a bond portfolio's sensitivity to interest rate changes. Simply put, a duration of 7 years means that if interest rates rise by 1 percentage point, the ETFâs value could theoretically decline by about 7%.
For example, the IEAG ETF has an average duration close to 7 years, implying high sensitivity to rate movements. In 2022, this sensitivity resulted in a nearly 18% decline over the year, illustrating the primary risk of this type of investment.
Conversely, an ETF with a shorter duration, such as those investing in short-term bonds or money market instruments, will exhibit lower volatility in response to interest rate changes.
Current Yield (2024): A Favorable Context After Years Near Zero
After a decade of very low or even negative rates, European government bond yields have returned to a more attractive level in 2024. The IEAG ETF currently offers a running yield around 3% to 3.5% per year, compared to nearly 0% in 2020. This rebound is mainly due to the ECBâs rate hikes and rising risk premiums.
This improvement in yields provides investors with an interesting opportunity to generate regular income while benefiting from diversification relative to equities.
The Lesson from 2022: Underestimated Duration Risk
The sharp correction experienced by bond ETFs in 2022 serves as a reminder that duration is a major risk factor. Many investors were surprised by the simultaneous decline in both equities and bonds, which reduced the expected shock-absorbing effect.
For example, the U.S. ETF TLT (duration over 20 years) lost more than 30%, while the IEAG ETF (duration ~7 years) lost nearly 18%. This shock underscored the importance of managing duration within a bond allocation, especially according to investment horizon and risk profile.
Inflation-Linked Bonds: OATi and TIPS for Protection
To guard against inflation risk, another category of bonds exists: inflation-linked bonds. In France, these are OATi (French Treasury Inflation-Linked Bonds, ISIN varies by maturity), while in the United States, they are TIPS (Treasury Inflation-Protected Securities).
These securities adjust the principal repaid based on inflation changes, thus providing real purchasing power protection. However, they often have high duration and lower nominal yields during periods of low inflation.
Who Should Invest in Eurozone Government Bond ETFs?
Eurozone government bonds via IEAG or XGLE are mainly suitable for the following profiles:
Investors over 50 years old with a medium to short investment horizon, particularly those preparing for retirement.
Defensive profiles seeking to limit overall portfolio volatility.
Prudent allocation recommended between 20% and 30% of the total portfolio, to benefit from diversification without excessive exposure to interest rate risk.
Beyond these profiles, it is advisable to adjust duration and bond allocation according to risk tolerance and interest rate outlook.
Money Market ETFs: A No Interest Rate Risk Alternative
For very cautious investors or those seeking interest rate exposure without duration risk, money market ETFs offer an interesting alternative. For example, the Lyxor Smart Overnight Return UCITS ETF (CSH2, ISIN LU2023678284) offers a yield of about 3.5% per year in 2024, with no sensitivity to interest rates.
These products invest in very short-term treasury instruments, providing high liquidity and capital protection. They can serve as a remunerated cash allocation within a diversified portfolio.
Summary Comparison IEAG vs XGLE
Criteria
iShares Core Euro Aggregate Bond (IEAG)
Xtrackers Eurozone Gov Bond (XGLE)
ISIN
IE00B3F81R35
LU0290355717
Index
Bloomberg Euro Aggregate Bond
Markit iBoxx EUR Eurozone Sovereigns
Bond Type
Mix of sovereign, supranational, corporate
Eurozone government bonds only
Average Duration
~7 years
~7 years
Current Yield (2024)
3.0 - 3.5 %
3.0 - 3.5 %
TER
0.10%
0.15%
Eligibility
PEA, CTO
PEA, CTO
Conclusion: Integrate Euro Bonds with Discernment
Eurozone government bond ETFs such as IEAG and XGLE offer French investors a simple, liquid, and tax-efficient solution to diversify their portfolios. After a decade of low rates, the 2024 environment offers more attractive yields around 3-3.5% per year.
However, the lesson from 2022 reminds us that duration risk should not be underestimated. It is essential to tailor bond allocation and maturities to oneâs profile and investment horizon. For more cautious or short-term investors, money market ETFs like Lyxor Smart Overnight Return (CSH2) can be an interesting alternative.
Finally, to protect against inflation, inflation-linked bonds (OATi, TIPS) can complement a traditional bond allocation.
In summary, integrating eurozone government bonds via ETFs is relevant for a balanced and defensive allocation, keeping in mind active interest rate risk management and portfolio diversification.
Disclaimer: This article is provided for informational purposes only and does not constitute personalized investment advice. Past performance is not indicative of future results. Before making any investment decisions, consult a financial advisor suited to your personal situation.
