Using U.S. Treasury Bonds to Reduce Risk

Written By Shelburne, Vermont Financial Advisors Frank Koster and Josh Kruk | Shelburne, VT Investment Office

Historically, bonds have played two primary roles in balanced investment portfolios. They have generally paid a higher level of current income than stocks, making them the go-to vehicle for those in need of current income. Additionally, they have provided a level of stability to portfolios due to their structure and relative safety (perceived and real). After a decades-long decline in interest rates, exacerbated by the global central bank response to the recent coronavirus pandemic, the income advantage of bonds has been significantly eroded (Exhibit 1). We believe however, there is still a substantial role to be played by bonds in your portfolio, particularly those issued by the United States Treasury. We are using U.S. Treasury bonds to reduce risk.

Exhibit 1:

Source: Federal Reserve Bank of St. Louis


Different Types of Bonds Have Different Types of Risk and Using U.S. Treasury Bonds to Reduce Risk

In aggregate, the price volatility of the bond market has been significantly less than the price volatility of the stock market over time. This is primarily because bonds represent debt on the issuing entity’s balance sheet, and debts generally get repaid (more on that later). When you purchase a bond, you receive interest at the bond’s stated coupon rate until you either sell it or it reaches maturity, at which time you are repaid the principal. If your bond has a fixed coupon, and market interest rates increase while you own your bond, the price of your bond declines. This occurs because your bond’s coupon is now less valuable relative to current market rates, and a prospective buyer of the bond would demand a lower purchase price to make up for that loss in value. The reverse is also true when market rates decline (i.e. the price of your bond will increase), which is why BOND PRICES MOVE INVERSELY RELATIVE TO INTEREST RATES! Different types of bonds have different embedded risks however, so they don’t all react to changes in interest rates with the same magnitude.

A bond’s risk can fall into several categories (maturity, credit, liquidity, etc.). Credit risk is a measure of a borrower’s likelihood of timely debt service payments of both the periodic coupon (interest) and ultimate return of principal at maturity. Most bonds carry a credit rating issued by one or more independent agencies which helps investors to understand the degree of credit risk associated with the bond. Rating scales are letter-based, with a “AAA” rating signifying the highest grade, “AA” the next highest grade, and so on.

U.S. Treasury bonds are generally believed to be of the highest credit quality, being backed by the full faith and credit of the U.S. government. On the other end of the credit spectrum are high yield (aka junk) bonds issued by low rated (BB and below) companies. Everything else equal, yields across the credit spectrum are generally highly correlated with rating. The higher the rating, the lower the yield and vice versa. This reflects the need for investors to be compensated for taking on the additional credit risk associated with lower-rated issuers.


Some Bonds May Reduce Risk Less than Investors Think

As interest rates have declined, particularly since the financial crisis, there has been an ongoing stretch for yield among income-oriented investors, leading to increasing amounts of investment dollars allocated to corporate bonds and the lower rated credit sectors.1 The benign market environment since the financial crisis has generally rewarded this strategy, but the more recent market turmoil has revealed this strategy’s weakness. The results below present evidence of this outcome.

We analyzed monthly total rate of return (TRR) data for several Blackrock exchange-traded funds (ETFs) that represent the major fixed income sectors. Our objective was to determine each ETF’s level of return correlation with the broad equity market. We used the IVV ETF, which tracks the S&P 500 index, as a proxy for the equity market.

Each fixed income ETF and a brief description of its sector representation is listed here in descending order of credit quality:

We compiled monthly TRRs for each of these ETFs for the period October 2007 (the earliest point at which returns were available for all of the ETFs) to March 2020 and calculated how correlated those returns were with the returns for stocks. This period includes the financial crisis and resulting market crash, as well as the long recovery period we have enjoyed for most of the last ten years. Most recently, the stock market has corrected rather violently again as a result of the coronavirus pandemic. Therefore, we feel the period measured represents a full market cycle.

The correlations for the entire period are shown below:

A positive percentage indicates positive correlation with stocks, and the larger the number, the greater the correlation. A negative number indicates that asset class actually moves in the opposite direction relative to stocks. The outcomes in the table are fairly intuitive. U.S. Treasuries, as the safe haven asset class, typically move in the opposite direction from stocks, deemed the riskiest of the asset classes we measured. Conversely, the high yield market moves directionally with stocks, which again seems intuitive since junk bonds represent the riskier end of the corporate debt market.


Using U.S. Treasury Bonds to Reduce Risk When It Matters Most

Given the extremes of recent market volatility, we decided to take our analysis a step further. We wanted to see how these correlations might shift during periods when stocks were doing either really well or very poorly. During the same measurement period (May 2007-March 2020) we analyzed correlations for only those months where the equity market TRR exceeded +5% or was worse than -5%. There were 18 months of each during the period, and these are the resulting returns correlations for those 36 months:

As can be seen from these numbers, during periods of extreme volatility in the market, all the positive correlations increased still further, and the negative correlations were more negative. Interestingly, in both sets of analysis, AGG (representing the broad investment grade bond market) was slightly positively correlated with stocks. Although this portfolio is roughly 70% allocated to bonds either explicitly or implicitly backed by the US government, there are sufficient other exposures in the portfolio to end with a neutral correlation with stocks. So what does this tell us, and how should it inform portfolio construction and the hedging of equity exposures in a balanced portfolio?

The quest for yield is a natural one, but it comes with a cost. Many individuals have bonds in their portfolios, including municipals, which they believe will provide stability to the overall portfolio if/when stocks go through a correction phase. However, as any form of credit risk is introduced, correlation to stocks increases, sometimes dramatically. As fund managers have stretched to increase advertised yields on their bond portfolios, they have increasingly turned to various forms of credit risk. These risks include the aforementioned investment-grade and high yield corporate bonds, as well as leveraged bank loans, collateralized loan obligations (CLOs), and lower rated municipal credits. As our correlation study shows, the higher the credit risk, the more likely a bond will go down when stocks go down, potentially compounding the negative returns experienced during the correction phase. In other words, the diversification and risk-reducing benefits received from these types of bonds tend to decline materially or even disappear at the exact time they are needed the most.


U.S. Treasury Bonds Have Provided a Cushion in the 2020 Bear Market

Even the investment grade market and municipal bonds are not much help during the most difficult market periods, as the chart below demonstrates. Exhibit 2 plots the year-to-date price performance of the five ETFs in our correlation study, plus IVV as proxy for the stock market. This is admittedly a very brief time period, but it is the environment we are dealing with today (evidenced by extreme volatility). As indicated earlier, bond prices move inversely relative to interest rates, but they don’t all move with equivalent magnitude. Further, if enough credit risk is added to a bond portfolio, this risk may partially or fully offset the benefits received from falling interest rates during extreme market events.

Exhibit 2:

    Source: Blackrock, Portfolio Visualizer

As has generally been the case in prior periods of volatility, using U.S. Treasury bonds to reduce risk has been an effective strategy during the most recent selloff in stocks. Interest rates are now at historical lows, which leads to the concern of how much lower rates can go and how much that might limit price upside for Treasuries going forward. While we do not forecast a particular future path for interest rates in the US, we do believe there is capacity for interest rates to move still lower than they are today. Several large, developed economies (Japan, Germany and France most notably) are issuing their debt at negative interest rates (That’s right, their creditors are paying them interest!), opening up the potential for rates in the US to follow a similar path. Only time will tell of course…

Notes:

1 "Where investing pros are turning for yield", Patti Dom, CNBC.com, February 20, 2020.

Written By Shelburne, Vermont Financial Advisors Frank Koster and Josh Kruk | Shelburne, VT Investment Office


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