Bond investments – via yield and spread

Bond investments – via yield and spread
Bond investments – via yield and spread
(c) iStock / petrenkod
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Investing in the bond market means

  • to invest one’s capital in an issuer and to trust that the promised interest (or “coupon”) payments and repayment (redemption) will be executed timely and in full, and
  • to look at the issuer’s rating, i.e. the ability and willingness of the debtor to pay.

The promised interest (coupon) payments should never be the sole reason for an investment. More important than the achievable interest is the certainty of full repayment at the end of maturity. In this article we take a look at the currently achievable yields of different credit rating segments and at the spread, the interest premium that can be achieved with corporate bonds.

Corporate bonds offer a spread on government bonds

For many private investors, corporate bonds are more popular than government bonds because they offer an interest rate premium (spread) compared to government bonds with the same remaining time to maturity. But how high is this spread, and what bonds should be used as a reference?

Before investing in the interest rate market, it is important to know that no issuer voluntarily pays more interest than they have to. A (credit-) safe government bond with a comparable maturity can be used as a point of reference and basis. A higher interest rate than this should cover the risks of the respective issuer. Usually, the risk of default is rated by investors as the risk with the highest priority.

Rating agencies are concerned with assessing this risk. They analyse the issuer and then assign a credit rating to a bond. This rating usually comes in the form of letters, with “AAA” (triple A) being the best possible rating. Lower ratings thus have a higher default risk associated with them, which should be compensated for by a correspondingly higher yield.

The yields of Eurozone companies by rating class

Let us first take a look at the yields of corporate bonds of different credit rating segments. Since there are many different companies, we use indices that represent a wide range of remaining time to maturity for the respective segment.

Chart for Euro corporate bond yields investment grade (data as of 25 August 2023).
Data: euro yields for corporate bonds (BOFA indices) and 5Y German government bond. 10Y representation; source: Refinitiv Datastream, as of 25 August 2023
Please note: this chart illustrates indices, no direct investment is possible. Past performance is not indicative of the future development of financial instruments.

At first glance, we can see a lot of lines. By looking at the chart from bottom to top, we can see the following:

  • The yield of the German Bund (i.e. the German government bond; shown as an area) is the lowest in the comparison, because it represents the best credit rating.
  • AAA euro corporate bonds (BOFA index) currently offer approximately 1% more yield than the German Bund
  • The further up we go (chart BOFA indices up to “BBB”), the higher the yield.

The chart also shows that yields change over time, but lower credit rating classes usually have to offer higher yields, as investors demand risk compensation.

The spread as compensation for risk

We have seen in the upper chart that nominal yields fluctuate over time. In a second step, we are interested in the risk premium (spread), because this indicates the surplus return we expect from a riskier investment. Here, we have selected the BBB credit rating segment from the example above.

From the chart above we can easily calculate the current spread ourselves (data from indices):

+ BBB yield BBB4.63 %
– 5Y yield German Bund2,59 %
Spread:2.04 %

However, bond investors should not only be interested in the current but also the historical spread. After all, how else should one assess whether the time to buy is currently right?

Yield differential (spread) corporate vs government bonds (data as of 25 August 2023).
Data: euro yields for corporate bonds (BOFA indices) and 5Y German government bond. 10Y representation; source: Refinitiv Datastream, as of 25 August 2023
Please note: this chart illustrates indices, no direct investment is possible. Past performance is not indicative of the future development of financial instruments.

In the chart we can see that the spread is subject to fluctuations over time, but currently tends to be in the upper range. These are the calculations from an index that covers a wide range of different bonds from the same credit segment and provides a rough orientation for investors. The data for individual bonds may accordingly differ due to their structure (e.g. issuer, country, maturity, etc.).

Conclusion: bond investments require more know-how than just knowledge of the coupon payments

In this article we wanted to give some background for the selection of corporate bonds. We have shown that yields and spreads change over time. But credit ratings can change over time as well. Downgrades or upgrades can occur. This in turn has a direct impact on the yield of the corresponding bond. 

For private investors, the selection and assessment of individual bonds is not a simple matter, because:

  • The interest rate markets are constantly in motion and yields can change very quickly, for example due to economic influences.
  • For all individual bonds, but especially for longer maturities, there are many variables for private investors to consider. This could be one of the reasons why private investors often prefer corporate bond issues with relatively short maturities.
  • Those who are not confident in selecting individual bonds can invest in bond funds (also referred to as fixed income funds), where professionals assess the individual securities and combine them in a broadly diversified fund.

For a glossary of technical terms, please visit this link: Fund Glossary | Erste Asset Management

Legal note:

Prognoses are no reliable indicator for future performance.

Please note: an investment in securities also entails risks in addition to the opportunities described.

For further information on “Investing in bonds with short maturitie”, please visit the blog


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This document is an advertisement. Unless indicated otherwise, source: Erste Asset Management GmbH. Our languages of communication are German and English.

The prospectus for UCITS (including any amendments) is published in accordance with the provisions of the InvFG 2011 in the currently amended version. Information for Investors pursuant to § 21 AIFMG is prepared for the alternative investment funds (AIF) administered by Erste Asset Management GmbH pursuant to the provisions of the AIFMG in connection with the InvFG 2011. The fund prospectus, Information for Investors pursuant to § 21 AIFMG, and the Key Information Document can be viewed in their latest versions at the web site within the section mandatory publications or obtained in their latest versions free of charge from the domicile of the management company and the domicile of the custodian bank. The exact date of the most recent publication of the fund prospectus, the languages in which the Key Information Document is available, and any additional locations where the documents can be obtained can be viewed on the web site A summary of investor rights is available in German and English on the website as well as at the domicile of the management company.

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Detailed information on the risks potentially associated with the investment can be found in the fund prospectus or Information for investors pursuant to § 21 AIFMG of the respective fund. If the fund currency is a currency other than the investor's home currency, changes in the corresponding exchange rate may have a positive or negative impact on the value of his investment and the amount of the costs incurred in the fund - converted into his home currency.

This document serves as additional information for our investors and is based on the knowledge of the staff responsible for preparing it at the time of preparation. Our analyses and conclusions are general in nature and do not take into account the individual needs of our investors in terms of earnings, taxation, and risk appetite. Past performance is not a reliable indicator of the future performance of a fund.

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