# Asset-Backed Securities (ABS): Understanding Types and Their Functions

## What Is an Asset-Backed Security (ABS)?

Asset-backed securities (ABS) is a type of financial investment that is collateralized by an underlying pool of [assets](https://www.investopedia.com/terms/a/asset.asp)—usually ones that generate a cash flow from debt, such as loans, leases, credit card balances, or receivables. It takes the form of a bond or note, paying income at a fixed rate for a set amount of time, until maturity. For income-oriented [investors](https://www.investopedia.com/terms/i/investor.asp), asset-backed securities can be an alternative to other debt instruments, like corporate bonds or bond funds.

### Key Takeaways

*   Asset-backed securities (ABS) are financial investments backed by a pool of income-generating assets like loans, leases, or credit card balances.
*   ABS provides diversification opportunities and potentially higher yields compared to traditional bonds, appealing to income-oriented investors.
*   The securitization process allows issuers to turn illiquid assets into marketable securities, facilitating capital raising and risk management.
*   ABS involves various key players, including issuers, investors, underwriters, and servicers, ensuring the smooth functioning of the market.
*   Risks associated with ABS include credit risk, prepayment risk, market risk, and liquidity risk, which investors need to evaluate carefully.

![Asset-Backed Security (ABS)](https://www.investopedia.com/thmb/EmlckqEmfmnVf2cEZcKMGEkjXs0=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/asset-backed-security-4201381-1-bd07a6656c814548a785cc0eeb5ff1c4.jpg)

*— Joules Garcia / Investopedia*

## How Asset-Backed Securities (ABS) Function

Asset-backed securities allow their [issuers](https://www.investopedia.com/terms/i/issuer.asp) to raise cash, which can be used for lending or other investment purposes. The underlying assets of an ABS are often [illiquid](https://www.investopedia.com/terms/i/illiquid.asp) and can’t be sold on their own. So, pooling assets together and creating a financial instrument out of them—a process called [securitization](https://www.investopedia.com/terms/s/securitization.asp)—allows the issuer to make illiquid assets marketable to investors. It also allows them to get shakier assets off their books, thus alleviating their [credit risk](https://www.investopedia.com/terms/c/creditrisk.asp).

The underlying assets of these pools may be home equity loans, automobile loans, credit card receivables, student loans, or other expected [cash flows](https://www.investopedia.com/terms/c/cashflow.asp). ABS issuers can be as creative as they desire. For example, asset-backed securities have been built based on cash flows from movie revenues, royalty payments, aircraft landing slots, toll roads, and solar photovoltaics. Just about any cash-producing vehicle or situation can be securitized into an ABS.

For investors, buying an ABS affords the opportunity of a revenue stream. ABS lets them invest in various income-generating assets, including unique ones not available elsewhere.

## Internal Mechanics of Asset-Backed Securities

Assume that Company X is in the business of making automobile loans. If a person wants to borrow money to buy a car, Company X gives that person the cash, and the person is obligated to repay the loan with a certain amount of [interest](https://www.investopedia.com/terms/i/interest.asp). Perhaps Company X makes so many loans that it starts to run out of cash. Company X can then package its current loans and sell them to Investment Firm X, thus receiving the cash, which it can then use to make more loans.

Investment Firm X will then sort the purchased loans into different groups called tranches. These tranches contain loans with similar characteristics, such as maturity, interest rate, and expected delinquency rate. Next, Investment Firm X will issue securities based on each tranche it creates. Similar to bonds, each ABS has a rating indicating its degree of riskiness—that is, the likelihood that the underlying loans will go into [default](https://www.investopedia.com/terms/d/default2.asp).

Individual investors then purchase these securities and receive the cash flows from the underlying pool of auto loans, minus an administrative fee that Investment Firm X keeps for itself.

An ABS will usually have three tranche classes: A, B, and C. The senior tranche, A, is almost always the largest tranche and is structured to have an investment-grade rating to make it attractive to investors.

The [B tranche](https://www.investopedia.com/terms/b/b-note.asp) has lower [credit quality](https://www.investopedia.com/terms/c/creditquality.asp), which means it offers a higher yield than the senior tranche. The C tranche has a lower credit rating than the B tranche and might be too risky to sell to investors. In such a case, the issuer keeps the C tranche and absorbs the losses.

## Different Types of Asset-Backed Securities Explained

Theoretically, an asset-based security can be created out of almost anything that generates an income stream, from mobile home loans to utility bills. But certain types are more common. Among the most typical ABS types are:

### Collateralized Debt Obligation (CDO)

A CDO is an ABS issued by a [special purpose vehicle (SPV)](https://www.investopedia.com/terms/s/spv.asp). The SPV is a business entity or trust formed specifically to issue that ABS. There are a variety of subsets of CDOs, including:

*   Collateralized loan obligations (CLOs) are CDOs made up of bank loans.
*   Collateralized bond obligations (CBOs) are composed of bonds or other CDOs.
*   Structured finance-backed CDOs have underlying assets of ABS, residential or commercial mortgages, or real estate investment trust (REIT) debt. 
*   Cash CDOs are backed by cash-market debt instruments, while other credit derivatives support synthetic CDOs.
*   [Collateralized mortgage obligations (CMOs)](https://www.investopedia.com/terms/c/cmo.asp) are composed of mortgages—or, more precisely, mortgage-backed securities (MBSs), which hold portfolios of mortgages (see below).

Though a CDO is structured like an ABS, some see it as a separate type of investment. In general, CDOs own a wider and more diverse range of assets—including other asset-based securities or CDOs.

### Home Equity ABS

[Home equity loans](https://www.investopedia.com/terms/h/homeequityloan.asp) are one of the largest ABS categories. Though similar to mortgages, home equity loans are often taken out by borrowers who have less-than-stellar credit scores or few assets—the reason why they didn’t qualify for a mortgage. These are amortizing loans—that is, payment goes toward satisfying a specific sum and consists of three categories: interest, principal, and prepayments.

> **Fast Fact**
>
> A mortgage-backed security (MBS) is sometimes considered a type of ABS but is more often classified as a separate variety of investment, especially in the United States. Both operate in essentially the same way; the difference lies in the underlying assets in the portfolio.Mortgage-backed securities are made by pooling mortgages only, while asset-backed securities include other loans or debts, like home equity loans. MBSs actually predate ABSs.

### Auto Loan ABS

Car financing is another large category of ABS. The cash flows of an auto loan ABS include monthly interest payments, principal payments, and prepayments (though the last is rarer, for an auto loan ABS is much lower than a home equity loan ABS). This is another amortizing loan.

### Credit Card Receivables ABS

Credit card receivables—the amount due on [credit card](https://www.investopedia.com/terms/c/creditcard.asp) balances—are a type of non-amortizing ABS: They go to a revolving line of credit, rather than toward the same set sum. Thus, they don’t have fixed payment amounts, while new loans and changes can be added to the composition of the pool. The cash flows of credit card receivables include interest, principal payments, and annual fees.

There is usually a [lockup period](https://www.investopedia.com/terms/l/lockup-period.asp) for credit card receivables where no principal will be paid. If the [principal](https://www.investopedia.com/terms/p/principal.asp) is paid within the lockup period, then new loans will be added to the ABS with the principal payment that makes the pool of credit card receivables staying unchanged. After the lockup period, the principal payment is passed on to ABS investors.

### Student Loan ABS

ABSs can be collateralized by either government student loans, guaranteed by the U.S. Department of Education, or private student loans. The former have had a better repayment record and a lower risk of default.

## Advantages of Investing in Asset-Backed Securities

Asset-backed securities can offer several compelling reasons to invest in them. ABS can provide [diversification](https://www.investopedia.com/terms/d/diversification.asp) opportunities beyond traditional asset classes like stocks and bonds. You can get exposure to a diverse pool of underlying assets such as mortgages, auto loans, and credit card receivables that you shouldn’t otherwise have traditional investment access in. This also can give you access to different industries entirely.

ABS can also have somewhat predictable cash flows. The underlying assets typically generate steady income streams such as monthly mortgage payments or loan repayments passed through to ABS holders. This stability can attract income-focused investors looking for reliable returns. If the borrower can't pay, the [cash flow](https://www.investopedia.com/terms/c/cashflow.asp) might suddenly stop.

ABS can provide higher yields compared to other fixed-income investments with similar ratings. This is because ABS transactions may be structured where different tranches (or slices) of securities are created to appeal to investors with varying risk appetites. If you want to take on more risk in exchange for potentially higher yields, you can opt into that. More conservative investors can opt for lower-risk tranches with correspondingly lower yields.

Last, asset-backed securities are frequently backed by collateral that can provide a degree of credit enhancement. This collateralization helps mitigate [credit risk](https://www.investopedia.com/terms/c/creditrisk.asp) to some extent, as the collateral can be sold to make the missed payments on the asset. Because of this, ABS can be a popular choice that may have greater liquidity compared to other securities depending on the market conditions or structure of the ABS. 

## Understanding the Risks of Asset-Backed Securities

There are also some risks to think about when investing in asset-backed securities. One primary risk is credit risk which refers to the possibility that borrowers underlying the ABS may default on their payments. This risk can vary depending on the credit quality of the underlying assets and the structure of the ABS transaction.

Another significant risk is prepayment risk, particularly relevant in mortgage-backed securities (MBS). [Prepayment risk](https://www.investopedia.com/terms/p/prepaymentrisk.asp) arises when borrowers repay their loans earlier than expected, such as during periods of falling interest rates. This can disrupt the expected cash flows to ABS holders. It can also dramatically reduce the return on investment, as an investor may have been hoping to general additional cash flow from interest payments that would have occurred had the debt not been prepaid. 

Market risk is another factor to consider, as changes in market conditions, interest rates, or economic factors can affect the value and performance of ABS. As we’ll look at later in the “2008 Global Financial Crisis” section, poor [valuations](https://www.investopedia.com/terms/v/valuation.asp) for the assets being backed could lead to upside loans. When certain market conditions like this exist, liquidity risk may arise if there is difficulty in selling ABS positions quickly or at fair prices.

## Who's Who in the Asset-Backed Securities Market

The asset-backed securities (ABS) market involves several key participants who each play a small part in the issuance, trading, and management of ABS transactions. Here are the key players:

*   **Issuers**: These are entities that originate or sponsor the underlying assets that will be securitized into ABS. Issuers can be financial institutions, banks, auto finance companies, [credit card](https://www.investopedia.com/credit-card-4689721) issuers, or mortgage lenders.
*   **Investors**: Investors in ABS include institutional investors, such as pension funds, insurance companies, [hedge funds](https://www.investopedia.com/terms/h/hedgefund.asp), and asset managers, as well as individual investors. They purchase ABS securities to earn returns from the cash flows generated by the underlying assets.
*   **Underwriters**: Underwriters facilitate the issuance of ABS securities by structuring the transaction, pricing the securities, and arranging their sale to investors. They play a part in assessing market demand, determining appropriate pricing, and ensuring compliance with regulatory requirements.
*   **Servicers**: Servicers are responsible for managing and administering the underlying assets on behalf of ABS investors. They collect payments from borrowers, handle delinquencies and defaults, and distribute cash flows to ABS holders according to the terms of the securitization.

## Legal Factors Influencing Asset-Backed Securities

Asset-backed securities transactions involve several important legal considerations. There are three main legal aspects of ABS to keep in mind.

1.  **Contracts**: ABS transactions are governed by comprehensive legal agreements that outline the rights and obligations of various parties involved, including issuers, investors, underwriters, servicers, and trustees. These contracts specify terms such as [payment schedules](https://www.investopedia.com/terms/a/amortization.asp), credit enhancements, conditions for early amortization, and the responsibilities of each party throughout the life of the securities. These factors are important to investors, as it’s the baseline numbers that dictate what the rate of return may be given if the borrower meets their scheduled payments on time. 
2.  **Disclosures**: Issuers are typically required to provide detailed disclosures about the underlying assets, the structure of the securitization, risks associated with the ABS, and other material information. Regulatory requirements often mandate specific disclosure standards to ensure investors have access to accurate and timely information.
3.  **Legal Protections**: ABS transactions often incorporate legal protections to safeguard investors' interests. These may include mechanisms such as credit enhancements, representations and warranties regarding the quality of the underlying assets, and provisions for the orderly resolution of disputes or defaults. From an investor's perspective, these features may protect against a complete loss (i.e. what would happen to the security if the property was destroyed by a natural disaster?). 

## Example of ABS (2008 Global Financial Crisis)

The [2007–2008 financial crisis](https://www.investopedia.com/articles/economics/09/financial-crisis-review.asp) was a culmination of factors rooted in the housing market bubble and financial market practices. It began with years of low interest rates and loose lending standards, which encouraged excessive borrowing and speculative investments in subprime mortgages. Mortgage-backed securities bundled these loans and were sold to investors.

However, as the housing bubble burst and homeowners defaulted on their mortgages, the underlying value of MBS declined sharply. Investors, including major financial institutions and global banks, suddenly found themselves holding securities backed by increasingly risky loans. This triggered a crisis of confidence in the financial markets as the true extent of losses became apparent, leading to widespread panic and freezing of credit markets.

The crisis escalated in 2007 with the collapse of two Bear Stearns hedge funds heavily invested in [subprime loans](https://www.investopedia.com/terms/s/subprimeloan.asp), signaling broader market instability. By 2008, the failures of major financial institutions like Lehman Brothers and the near-collapse of others like Bear Stearns and Merrill Lynch highlighted the systemic risks posed by interconnected global financial markets.

## What Is an Example of an Asset-Backed Security?

A collateralized debt obligation is an example of an asset-based security (ABS). It is like a loan or bond, one backed by a portfolio of debt instruments—bank loans, mortgages, credit card receivables, aircraft leases, smaller bonds, and sometimes even other ABSs or CDOs. This portfolio acts as collateral for the interest generated by the CDO, which is reaped by the institutional investors who purchase it.

## What Is Asset Backing?

Asset backing refers to the total value of a company’s shares in relation to its assets. Specifically, it refers to the total value of all the assets that a company has, divided by the number of outstanding shares that the company has issued.

In terms of investments, asset backing refers to a security with value deriving from a single asset or a pool of assets; these holdings act as collateral for the security—“backing” it, in effect.

## What Does ABS Stand For in Accounting?

In the business world, ABS stands for accounting and billing system. It's the software used to process invoice and potentially apply remittances to against those payments.

## What Is the Difference Between MBS and ABS?

An asset-based security (ABS) is similar to a mortgage-backed security (MBS). Both are securities that, like bonds, pay a fixed rate of interest derived from an underlying pool of income-generating assets—usually debts or loans. The main difference is that an MBS, as its name implies, consists of a package of mortgages (real estate loans). In contrast, an ABS is usually backed by other sorts of financing—student loans, auto loans, or credit card debt.

Some financial sources use ABS as a generic term, encompassing any sort of securitized investment based on underlying asset pools—in which case, an MBS is a kind of ABS. Others consider ABSs and MBSs to be separate investment vehicles.

## How Does Asset Securitization Work?

Asset securitization begins when a lender (or any company with loans) or a firm with income-producing assets earmarks a bunch of these assets, and then arranges to sell the lot to an investment bank or other financial institution. This institution often pools these assets with comparable ones from other sellers, then establishes a special purpose vehicle (SPV)—an entity set up specifically to acquire the assets, package them, and issue them as a single security.

The issuer then sells these securities to investors, usually institutional investors (hedge funds, mutual funds, pension plans, etc.). The investors receive fixed- or floating-rate payments from a trustee account funded by the cash flows generated by the portfolio of assets.

Sometimes the issuer divides the original asset portfolio into slices, called tranches. Each tranche is sold separately and bears a different degree of risk, indicated by a different credit rating.

## The Bottom Line

Asset-backed securities (ABS) are investment vehicles that allow investors, mainly large institutions such as hedge funds, insurance companies, and pension funds, to gain exposure to a diverse pool of income-generating assets. These securities are created through securitization, where pools of loans or other receivables are packaged together. ABS can offer higher yields than traditional corporate bonds, providing a predictable income stream while also allowing for portfolio [diversification](https://www.investopedia.com/terms/d/diversification.asp) . However, potential investors should be aware of the associated risks, such as credit, prepayment, and market risks, which can affect the securities' performance.

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