Mortgage-Backed Security (MBS) (2024)

An investment secured by a mortgage or collection of mortgages

Written byTim Vipond

Published April 30, 2019

Updated June 15, 2023

A Mortgage-backed Security (MBS) is a debt security that is collateralized by a mortgage or a collection of mortgages. An MBS is an asset-backed security that is traded on the secondary market, and that enables investors to profit from the mortgage business without the need to directly buy or sell home loans.

Mortgages are sold to institutions such as an investment bank or government institution, which then package it into an MBS that can be sold to individual investors. A mortgage contained in an MBS must have originated from an authorized financial institution.

Mortgage-Backed Security (MBS) (1)

When an investor buys a mortgage-backed security, he is essentially lending money to home buyers. In return, the investor gets the rights to the value of the mortgage, including interest and principal payments made by the borrower.

Selling the mortgages they hold enables banks to lend mortgages to their customers with less concern over whether the borrower will be able to repay the loan. The bank acts as the middleman between MBS investors and home buyers. Typical buyers of MBS include individual investors, corporations, and institutional investors.

Types of Mortgage-Backed Securities

There are two basic types of mortgage-backed security: pass-through mortgage-backed security and collateralized mortgage obligation (CMO).

1. Pass-through MBS

The pass-through mortgage-backed security is the simplest MBS, structured as a trust, so that principal and interests payments are passed through to the investors. It comes with a specific maturity date, but the average life may be less than the stated maturity age.

The trust that sells pass-through MBS is taxed under the grantor trust rules, which dictates that the holders of the pass-through certificates should be taxed as the direct owners of the trust apportioned to the certificate.

2. Collateralized Mortgage Obligation (CMO)

Collateralized mortgage obligations comprise multiple pools of securities, also known as tranches. Each tranche comes with different maturities and priorities in the receipt of the principal and the interest.

The tranches are also given separate credit ratings. The least risky tranches offer the lowest interest rates while the riskier tranches come with higher interest rates and, thus, are generally more preferred by investors.

How a Mortgage-Backed Security Works

When you want to buy a home, you approach a bank to give you a mortgage. If the bank confirms that you are creditworthy, it will deposit the money into your account. You will then be required to make periodic payments to the bank according to your mortgage agreement. The bank may choose to collect the principal and interest payments, or it may opt to sell the mortgage to another financial institution.

If the bank decides to sell the mortgage to another bank, government institution, or private entity, it will use the proceeds from the sale to make new loans. The institution that buys the mortgage loan pools the mortgage with other mortgages having similar characteristics, such as interest rates and maturities.

It then sells these mortgage-backed securities to interested investors. It uses the funds from the sale to buy more securities and float more MBS in the open market.

The Role of Government in MBS

As a response to the Great Depression of the 1930s, the government established the Federal Housing Administration (FHA) to help in the rehabilitation and construction of residential houses. The agency assisted in developing and standardizing the fixed-rate mortgage and popularizing its usage.

In 1938, the government created Fannie Mae, a government-sponsored agency, to buy the FHA-insured mortgages. Fannie Mae was later split into Fannie Mae and Ginnie Mae to support the FHA-insured mortgages, Veterans Administration, and Farmers Home Administration-insured mortgages.,

In 1970, the government created another agency, Freddie Mac to perform similar functions to those performed by Fannie Mae.

Freddie Mac and Fannie Mae both buy large numbers of mortgages to sell to investors. They also guarantee timely payments of principal and interest on these mortgage-backed securities. Even if the original borrowers fail to make timely payments, both institutions still make payments to their investors.

The government, however, does not guarantee Freddie Mac and Fannie Mae. If they default, the government is not obligated to come to their rescue. However, the federal government does provide a guarantee to Ginnie Mae. Unlike the other two agencies, Ginnie Mae does not purchase MBS. Thus, it comes with the lowest risk among the three agencies.

The Role of MBS in the 2008 Financial Crisis

Low-quality mortgage-backed securities were among the factors that led to the financial crisis of 2008. Although the federal government regulated the financial institutions that created MBS, there were no laws to directly govern MBS themselves.

The lack of regulation meant that banks could get their money right away by selling mortgages immediately after making the loans, but investors in MBS were essentially not protected at all. If the borrowers of mortgage loans defaulted, there was no sure way to compensate MBS investors.

The market attracted all types of mortgage lenders, including non-bank financial institutions. Traditional lenders were forced to lower their credit standards to compete for home loan business.

At the same time, the U.S. government was pressuring lending institutions to extend mortgage financing to higher credit risk borrowers. This led to the creation of massive amounts of mortgages with a high risk of default. Many borrowers simply got into mortgages that they eventually could not afford.

With a steady supply of, and increasing demand for, mortgage-backed securities, Freddie Mac and Fannie Mae aggressively supported the market by issuing more and more MBS. The MBS created were increasingly low-quality, high-risk investments. When mortgage borrowers began to default on their obligations, it led to a domino effect of collapsing MBS that eventually wiped out trillions of dollars from the US economy. The effects of the sub-prime mortgage crisis spread to other countries around the globe.

Related Readings

We hope you enjoyed reading CFI’s guide to a mortgage-backed security. CFI offers the Financial Modeling & Valuation Analyst (FMVA)™ certification program for those looking to take their careers to the next level. To keep learning and advancing your career, the following resources will be helpful:

Mortgage-Backed Security (MBS) (2024)

FAQs

Mortgage-Backed Security (MBS)? ›

Mortgage-backed securities (MBS) are investment products similar to bonds. Each MBS consists of a bundle of home loans and other real estate debt bought from the banks that issued them. Investors in mortgage-backed securities receive periodic payments similar to bond coupon payments.

What does MBS stand for mortgage-backed securities? ›

Mortgage-backed securities (MBS) are investment products similar to bonds. Each MBS consists of a bundle of home loans and other real estate debt bought from the banks that issued them. Investors in mortgage-backed securities receive periodic payments similar to bond coupon payments.

How does an MBS work? ›

To create an MBS, the bank will bundle your loan with hundreds or thousands of other mortgages. These loans are then sold to an investment bank as a single bond. The investment bank then sections off the loans by their quality and sells them to other investors.

Why are MBS used? ›

Like most financial innovations, the purpose of an MBS is to increase return and diversify risk. By securitizing pools of similar mortgages, investors can absorb the statistical likelihood of non-payment. However, an MBS is a complicated instrument and comes in many different forms.

What is the difference between MBS and CMBS? ›

Mortgage backed securities (MBS) come in two main varieties; commercial mortgage backed securities (CMBS) and residential mortgage backed securities (RMBS). While CMBS are backed by large commercial loans, referred to as CMBS or conduit loans, RMBS are backed by residential mortgages, generally for single family homes.

What are the three types of mortgage-backed securities? ›

There are three basic types of mortgage-backed security: pass-through MBS, collateralized mortgage obligation (CMO), and collateralized debt obligation (CDO). CMOs and CDOs are organized into pools of mortgages with similar risk profiles known as tranches.

Is an MBS a debt security? ›

Mortgage-backed securities (MBS) are debt obligations that represent claims to the cash flows from pools of mortgage loans, most commonly on residential property.

Who owns the most mortgage-backed securities? ›

The Federal Reserve is the single largest agency MBS investor through its large-scale asset purchase program, with total holdings of $2.5 trillion as of October 2021.

What happens to MBS when interest rates fall? ›

A mortgage-backed security is an investment product that consists of thousands of individual mortgages. Investors can purchase MBSs on the secondary market from the banks that issued the loans. When MBS prices fall, residential mortgage rates tend to rise – and vice versa.

Who buys the most mortgage-backed securities? ›

The biggest investors are Fannie Mae and Freddie Mac, which buy conforming conventional mortgages. Ginnie Mae buys government loans like those from the FHA and VA.

How do investors make money from MBS? ›

With a traditional MBS, each investor receives a monthly pro-rata distribution of any principal and interest payments made by homeowners. The bondholder receives some return of principal until final maturity, when homeowners pay the mortgages in the pool in full.

Can individuals buy MBS? ›

The principal and interest payments the mortgage borrowers pay to the bank are “passed through” to MBS investors each month. Investors can purchase individual MBS securities, or mutual funds comprised of MBS holdings from firms like BlackRock.

Why did mortgage-backed securities fail? ›

Ultimately, as house prices declined nationwide and mortgage defaults began rising, the value of all the mortgage-backed securities deteriorated. The rise in defaults, by undermining the value of trillions of dollars of mortgage-backed securities, severely disrupted the securitization funding mechanism itself.

What is the difference between MBS and covered bonds? ›

Covered bonds are used more to increase liquidity than are MBS. MBS are more often used in ways consistent with exploiting some kinds of agency problems.

Why are CMBS loans bad? ›

The major disadvantages of CMBS loans include: Less autonomy in the operation of the property and limited flexibility to deviate from the terms of the loan documents. Difficulty in releasing collateral. Expensive to exit.

What is the difference between corporate bonds and MBS? ›

MBSs largely differ from other bonds in their payment structure. Bonds typically make payments of the principal semiannually or at maturity, while MBSs make payments of both interest and principal monthly.

What are the simplest mortgage-backed securities called? ›

Pass-through MBS

The pass-through mortgage-backed security is the simplest MBS, structured as a trust, so that principal and interests payments are passed through to the investors. It comes with a specific maturity date, but the average life may be less than the stated maturity age.

Is Fannie Mae a MBS? ›

Fannie Mae MBS offers investors high-quality assets with attractive yields to fit various portfolio needs or investment strategies. Investors should exercise care to fully understand the value of any mortgage-backed investment and diligently review the applicable disclosure documents.

Why does the Fed buy MBS? ›

Agency MBS are mortgage bonds which have underlying mortgages backed by Fannie Mae, Freddie Mac and Ginnie Mae. The purchase of these MBS by the Fed helps keep rates low and maintains a steady flow of credit. This intervention is key because homeownership accounts for around 15% of total U.S. GDP.

Are MBS considered derivatives? ›

A good example of a derivative is the mortgaged-backed security ( MBS ), first issued in 1970 by the Government National Mortgage Association (GNMA, or Ginnie Mae, as it is usually called), which is created by the securitization of a pool of mortgages.

Do banks hold MBS? ›

Government-backed agencies, federal banks, and private issuers can issue and guarantee MBSs.

Why were mortgage-backed securities MBS considered toxic? ›

Toxic assets are investments that have become worthless because the market for them has collapsed. Toxic assets earned their name during the 2008 financial crisis when the market for mortgage-backed securities burst along with the housing bubble.

How do I buy MBS bonds? ›

Mortgage-backed securities can be purchased at most full-service brokerage firms and some discount brokers. The minimum investment is typically $10,000; however, there are some MBS variations, such as collateralized mortgage obligations (CMOs), that can be purchased for less than $5,000.

What is the yield on a mortgage-backed security? ›

What is mortgage yield? It's the amount of returns that are generated from a set of mortgage-backed securities, such as mortgage-backed bond issues. Mortgage yield is usually calculated as a monthly rate, though it's also possible to project the yield for a longer period of time.

How does MBS pricing work? ›

The better the return, the higher the demand. MBS prices rise and fall as demand rises and falls. At its simplest, this is how mortgage rates are determined.

What are the problems with mortgage-backed securities? ›

MBSs most often offer higher yields than U.S. Treasurys, but they also carry risks. These include reinvestment risks, prepayment risk, and the risk of negative convexity.

Who invented mortgage-backed securities? ›

Lewis S. Ranieri (/rəniˈɛri/; born 1947) is a former bond trader, and founding partner and current chairman of Ranieri Partners, a real estate firm. Brooklyn, New York, U.S. He is considered the "father" of mortgage-backed securities and co-founder of mortgage-backed securities with Anthony J.

Will Fed sell MBS? ›

Jerome Powell, chairman of the Federal Reserve, said Wednesday that the central bank will ultimately start selling mortgage-backed securities as its draws down its balance sheet, but it would not be doing so in the near future.

Are MBS tax free? ›

In the case of mortgage-backed revenue bonds, also known as housing bonds, the coupon payments that investors receive are typically exempt from taxes.

Who got rich during the 2008 financial crisis? ›

Hedge fund manager John Paulson reached fame during the credit crisis for a spectacular bet against the U.S. housing market. This timely bet made his firm, Paulson & Co., an estimated $2.5 billion during the crisis.

Who is to blame for the Great Recession of 2008? ›

The Biggest Culprit: The Lenders

Most of the blame is on the mortgage originators or the lenders. That's because they were responsible for creating these problems. After all, the lenders were the ones who advanced loans to people with poor credit and a high risk of default.

Is a mortgage bond a MBS? ›

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 for borrowers to invest in real estate at an affordable price point. This article will explain what a mortgage bond is and how it affects the real estate market.

How do people make money from bonds? ›

There are two ways to make money by investing in bonds. The first is to hold those bonds until their maturity date and collect interest payments on them. Bond interest is usually paid twice a year. The second way to profit from bonds is to sell them at a price that's higher than you initially paid.

Is the Fed buying CMBS? ›

spreads, post-COVID-19

Mortgage spreads did widen sharply, but the US Fed was very alive to these risks, and stepped into the agency- guaranteed MBS market, buying enormous quantities of agency-RMBS and agency-CMBS from March to May that allowed mortgage rates to stabilize at, or near, record lows1.

How do lenders make money on CMBS? ›

CMBS lenders are essentially wholesalers, benefitting from what the retail industry would call a bulk discount. They originate loans at a certain interest rate, then sell them later at a different interest rate thanks to the bulk package they provide through their bonds.

Why did the CMBS market crash in late 2008? ›

The CMBS market crashed spectacularly in late 2008 after an equally spectacular run from 2003 through mid-2007. The cause of this crash and subsequent CMBS market freeze was remarkably simple: low-quality mortgage pools were oversold by investment banks and overrated by the rating agencies.

What is the difference between MBS and mortgage? ›

Explanation. The lender gets to keep the house or property as collateral in the case of a mortgage. Mortgage-backed securities, on the other hand, provide investors with a safe investment while also allowing the original mortgage lenders to raise capital to lend to potential homeowners.

What are the 5 various type of bonds? ›

There are five main types of bonds: Treasury, savings, agency, municipal, and corporate. Each type of bond has its own sellers, purposes, buyers, and levels of risk vs. return. If you want to take advantage of bonds, you can also buy securities that are based on bonds, such as bond mutual funds.

What is the most secure corporate bond? ›

Corporate bonds can be issued by either public or private companies. Corporate bonds are rated by services such as Standard & Poor's, Moody's, and Fitch, which calculate the risk inherent in each specific bond. The most reliable (least risky) bonds are rated triple-A (AAA).

How many loans are in an MBS? ›

The pool could include 1,000 loans or more. Once packaged, Fannie Mae will offer the MBS for trading on the bond market. The requirements for inclusion in specific pools is dependent on individual loan characteristics and risk profiles. Every mortgage investor also has minimum standards for the loans they will buy.

Do MBS affect mortgage rates? ›

The cost of mortgage-backed securities has a direct impact on residential mortgage rates. This is because mortgage companies lose money when they issue loans while the market is down. When the prices of mortgage-backed securities drop, mortgage providers generally increase interest rates.

Who owns most mortgage-backed securities? ›

The Federal Reserve is the single largest agency MBS investor through its large-scale asset purchase program, with total holdings of $2.5 trillion as of October 2021.

How is an MBS priced? ›

The better the return, the higher the demand. MBS prices rise and fall as demand rises and falls. At its simplest, this is how mortgage rates are determined.

What is interest risk in MBS? ›

With the exception of cash equivalents, all fixed income investors are exposed to interest rate risk. Interest rate risk is defined as the risk of principal losses due to changes in the level of interest rates. The risks associated with MBS are more difficult to measure than other securities, however.

How much MBS does the Fed own? ›

The Fed currently holds about $2.6 trillion of MBS as part of its roughly $8 trillion securities portfolio. That is about a quarter of the total MBS market, what George referred to as an "enormous" share that raises questions about the appropriate extent of the central bank's presence.

What are the pros and cons of MBS? ›

MBS offer several benefits to investors, including liquidity, diversification, and attractive yields, but they also carry several risks, including credit risk, prepayment risk, and interest rate risk. The market for MBS is large and complex, with many different types of investors and market participants.

What happens to MBS when interest rates rise? ›

When interest rates go up, fixed maturity bond prices go down and vice versa. Mortgage backed securities follow the same general rule with a fairly notable exception that relates to changes in the expected maturity of a mortgage backed security as interest rates change.

What are the advantages of mortgage-backed securities? ›

Features and benefits

Mortgage-backed securities typically offer yields that are higher than government bonds. Securities with higher coupons offer the potential for greater returns but carry increased credit and prepayment risk, meaning the realized yield could be lower than initially expected.

How did MBS cause the financial crisis? ›

The Bottom Line

People borrowed to buy houses even if they couldn't really afford them. Investors created a demand for low premium MBS, which in turn increased demand for subprime mortgages. These were bundled in derivatives and sold as insured investments among financial traders and institutions.

Is the Fed selling MBS? ›

The Fed phased out purchases of MBS in mid-September. From that point on through the end of November, the four-week average roll-offs of MBS was around $20 billion.

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