With Mortgage Bonds, Education Is Important

The article discusses the investment-grade asset-backed bond market, focusing on mortgage-backed securities (MBS) and ETFs like the WisdomTree Mortgage Plus Bond Fund (MTGP). While MBS offer attractive yields, currently with a 68 basis point advantage over 10-year Treasury yields, they carry prepayment and extension risks tied to interest rate fluctuations and homeowner behavior; currently, prepayment risk is relatively low due to homeowners locking in historically low interest rates. MTGP's embedded income yield is 5.3%.

Analysis

The securitized fixed income market, particularly investment-grade mortgage-backed securities (MBS), presents a significant opportunity for conservative income investors, with a large portion backed by U.S. government agencies, thus implying low credit risk. Actively managed funds like the WisdomTree Mortgage Plus Bond Fund (MTGP) offer access to this market. MBS possess unique characteristics, notably fluctuating monthly payments which include principal and interest, contingent on homeowner payment behaviors. Key risks include prepayment risk, where homeowners refinance early in a falling rate environment, potentially forcing reinvestment at lower yields; however, this risk is currently assessed as relatively low by Collin Martin of Charles Schwab due to many homeowners having secured historically low interest rates. Conversely, extension risk arises when high interest rates deter early mortgage payoffs, delaying principal return. Despite these risks, MBS currently offer an attractive yield profile, with MTGP exhibiting an embedded income yield of 5.3%. The Bloomberg US MBS Index shows a current yield advantage of 68 basis points over the 10-year Treasury yield, an increase from the 15-year average of 58 basis points, highlighting near-term allure.

Key Decisions for Investors

• Investors seeking income could consider actively managed MBS funds, such as MTGP with its 5.3% embedded income yield and current 68 basis point spread over 10-year Treasuries, for potentially enhanced returns within their fixed income portfolio, while acknowledging the active management aims to mitigate specific bond risks.
• It is crucial to monitor the interest rate environment closely, as significant declines could elevate prepayment risk, whereas sustained high rates may prolong extension risk, thereby impacting the timing of principal repayment and reinvestment opportunities.
• Investors should assess their tolerance for fluctuating monthly cash flows, a characteristic of MBS which distribute both principal and interest, and factor in the current low prepayment risk environment when evaluating the near-term attractiveness of this asset class.