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What Are Mortgage Bonds And How Do They Work?

Feb 25, 2024

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It may surprise you to learn that the home buying process isn’t over after you close on a mortgage. There might be nothing left for you to do, but in all likelihood, your lender will immediately sell your mortgage and add it to a pool of other mortgages.

This is what’s known as a mortgage bond, and it’s a type of mortgage-backed security (MBS). Mortgage bonds protect lenders and make it possible to invest in real estate at an affordable price point.

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Mortgage Bond Definition

A mortgage bond is an investment backed by a pool of mortgages that a lender trades to another party. A mortgage bond is different from a mortgage loan, which is an agreement between a lender and a borrower that allows a borrower to own a property they could not purchase outright.

Infographic explaining the difference between mortgage bonds and loans.

Lenders sell a mortgage bond to real estate investors, who receive periodic interest payments on mortgage loans until they’re paid off. An investor has a claim on the assets put up as collateral, which would be the houses, and can repossess them in the event of mortgage default.

Since a group of assets secures mortgage-backed bonds, this offers some protection to the bondholder. If a borrower defaults on their mortgage, the bondholder can sell the home and use proceeds from a foreclosure sale to ensure investors get paid.

Mortgage Bonds Remain A Major Part Of The US Economy

Those newer to the world of investing might question whether mortgage bonds remain an option. In fact, mortgage bonds are currently purchased and sold extensively in financial markets. Mortgage bonds provide a stable income stream and can be a great addition to an investment portfolio.
Simple infographic depicting the mortgage bond process.

How Do Mortgage Bonds Work?

Before diving into the different types of mortgage bonds and their benefits, it’s important to understand how they work.

After a lender issues a mortgage loan to a borrower, the lender combines the mortgage with other mortgages and sells the bundle of mortgages to federal government agencies, government-sponsored enterprises (GSEs) or investment banks. The GSE or bank purchases the bundle and groups them with more mortgage loans into a “mortgage pool.” Then they sell them to investors as mortgage bonds.

Investors can earn a profit on mortgage bonds in two ways:

  • Appreciation: As with any investment security, a mortgage bond’s value can fluctuate. You’ll earn additional revenue if you sell your mortgage bond once its value has appreciated.
  • Regular interest payments: When a borrower makes monthly mortgage payments, the issuer pays out a chunk of the interest to shareholders.

Mortgage bonds are low-risk investments. They usually have a lower return rate than riskier investment options.

What Is The Relationship Between Bonds And Mortgage Rates?

Mortgages and the bond market have an inverse relationship with each other. If bonds are expensive, that means mortgage rates will be low. When bonds are inexpensive, mortgage rates will be high.

Are Mortgage Bonds A Safe Investment?   

Investors generally consider mortgage bonds a relatively safe investment because of the security that comes with real property. A bondholder can sell a foreclosed property to recoup losses.

Government-sponsored enterprises like Fannie Mae and Freddie Mac also help make mortgage bonds safer to invest in. By backing these investments, they make them lower risk.

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Advantages And Disadvantages Of Mortgage Bonds

Like any investment, it’s important to be aware of both the advantages and disadvantages. Familiarize yourself with a few pros and cons before investing in mortgage bonds.

Advantages:

  • Protection for shareholders: If a homeowner defaults on payments, shareholders have a guarantee for payment and interest from the bond issuer.
  • Available to shareholders with poor credit: Poor credit isn’t a problem. Investors with poor credit can access larger amounts of capital at lower borrowing costs.
  • Safe investment choice: Mortgage bonds are a safer investment than stocks.

Disadvantages:

  • Risk of loss: There’s a risk of losing money on an MBS if interest rates are lower than long-term inflation.
  • Yields are lower: Yields are lower than corporate bond yields.

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Why Invest In The Mortgage Bond Market?

Investors typically purchase mortgage bonds because they’re looking for a reliable and safe income stream. Most investors favor mortgage-backed securities over Treasury bonds. They believe an MBS is a safer investment because they are backed by real property and the U.S. government. And there is an option to sell foreclosed properties to recover their losses. This makes them a good option for conservative investors.

A mortgage bond can also be a good source of reliable income. When a homeowner takes out a mortgage, they repay the loan’s principal balance and make interest payments. Recurring interest payments can become a stable source of income for investors.

Mortgage Bonds And Fixed-Coupon Bonds

Mortgage bonds differ from standard fixed-coupon (also known as fixed-income) bonds in several ways. An example of a fixed-coupon bond would be a corporate bond, which is issued by a company to raise funds and then pays out a fixed amount in interest until it matures. Our chart compares key differences between the two types of bonds.


Mortgage Bonds Fixed-Coupon Bonds
Payout Interval Monthly Semiannually
Payout Composition Made up of interest and principal Made up of interest
Payout Amount Fluctuates Remains the same
Principal Accrual Occurs gradually every month Occurs when bond matures
Maturity Date Average  Short 

The Bottom Line

Once you close on your mortgage, it may be bought and sold several times over the life of the loan. Mortgage bonds are a safe and reliable investment for conservative investors and free up cash so lenders can continue to offer mortgages to home buyers.

If you’re interested in buying a home, learn as much as you can about how the home buying process works. If you’re ready to purchase a home, apply for a mortgage today with Rocket Mortgage®.

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Victoria Araj

Victoria Araj is a Team Leader for Rocket Mortgage and held roles in mortgage banking, public relations and more in her 19+ years with the company. She holds a bachelor’s degree in journalism with an emphasis in political science from Michigan State University, and a master’s degree in public administration from the University of Michigan.