HomeFinance & EconomicsFinancial MarketsWhat is Mortgage-Backed Security (MBS)?
Finance & Economics·2 min·Updated Mar 11, 2026

What is Mortgage-Backed Security (MBS)?

Mortgage-Backed Security

Quick Answer

A Mortgage-Backed Security (MBS) is a type of investment that is made up of a bundle of home loans. Investors in MBS receive payments that come from the mortgage borrowers, making it a way to invest in real estate without owning property directly.

Overview

A Mortgage-Backed Security (MBS) is created when multiple home loans are grouped together and sold as a single investment. These loans are typically made by banks to homeowners, and when the banks sell them, they package them into securities that investors can buy. Investors earn money from these securities through the mortgage payments made by homeowners, which are passed along to them as income. MBS works by allowing banks to free up cash to make more loans. When a bank sells a bundle of mortgages, it receives money upfront, which can be used to lend to new borrowers. This process not only helps banks manage their risk but also provides investors with a way to earn returns based on the mortgage market's performance. One real-world example of MBS is the role they played during the housing boom in the early 2000s. Many investors bought MBS, attracted by the promise of steady returns. However, when homeowners began defaulting on their loans, it led to significant losses for investors and contributed to the financial crisis of 2008, highlighting the importance of understanding the risks involved in investing in such securities.


Frequently Asked Questions

Investing in MBS carries risks such as interest rate changes and the possibility of borrower defaults. If interest rates rise, the value of existing MBS may fall, and if homeowners fail to make their mortgage payments, investors can lose money.
Investors earn money from MBS through the interest payments made by homeowners on their mortgages. These payments are collected by the issuer of the MBS and then distributed to the investors as income.
Mortgage-Backed Securities are typically issued by government-sponsored enterprises like Fannie Mae and Freddie Mac, as well as private financial institutions. These entities pool together mortgages and sell them to investors to help finance home loans.