Z-tranches , also known as accretion bonds or accrual bonds , are structured so that they pay no interest until the lockout period ends and principal payments begin.
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During the accrual period, the principal amount outstanding increases at a compounded rate and the investor does not face the risk of reinvesting at lower rates if market yields decline. Typical Z-tranches are structured as the last tranche in a series of sequential or PAC and companion tranches, and typically have longer average lives than these classes. However, Z-tranches can be structured with intermediate-term average lives as well. After the earlier bonds in the series have been retired, the Z-tranche holders start receiving cash payments that include both principal and interest.
While the presence of a Z-tranche can stabilize the cash flow in other tranches, the market value of Z-tranches can fluctuate widely, and their average lives depend on other aspects of the offering. Because the interest on these securities is taxable when it is credited, even though the investor receives no interest payment, Z-tranches are often suggested as investments for tax-deferred accounts.
The market values of POs are extremely sensitive to prepayment rates. If prepayments accelerate, the value of the PO will increase. On the other hand, if prepayments decelerate, the value of the PO will drop. When creating a PO mortgage security, the resulting stripped interest payments necessitate the creation of Interest-Only IO securities. They have no face or par value. Unlike POs, IOs increase in value when interest rates rise and prepayment rates slow; consequently, they are often used to hedge portfolios against interest rate risk.
However, IO investors take on the risk that if prepayment rates are high enough, they may actually receive less cash back than they initially invested.
- Real Estate Mortgage Investment Conduits (REMIC).
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IOs and POs are more sensitive to changes in prepayment speeds and that heightened risk may make them unsuitable for some investors. Sometimes the interest rates on these tranches are stated in terms of a formula based on the designated index, meaning they move up or down by more than one basis point for each increase or decrease in the index. These so-called super-floaters offer leveraged returns when rates rise, while inverse floaters which move in a direction opposite to the changes in the designated index offer leveraged returns when rates move down.
Given their leveraged nature, these securities also carry increased risk. All types of floating-rate tranches may be structured as PAC, TAC, companion, or sequential tranches, and are often used to hedge interest rate risks in portfolios.
Residuals are not classified as regular interest and may be structured as sequential, PAC, floating- rate, or inverse-floater tranches, and differ from regular tranches primarily in their tax characteristics, which can be more complex than other CMO tranches. CMOs issued as non-REMICs also have residuals that are sold as a separate security, such as a trust certificate or a partnership interest.
Callable pass-throughs can be used as collateral to back CMOs. Investors should be aware that a call of some or all of the underlying callable pass-throughs may result in a call of all of the outstanding tranches in the CMO they invested in because some or all of the securities underlying the CMO will be redeemed. An agency mortgage-backed security is issued with the guarantee of a government agency or a Government Sponsored Enterprise GSE. Ginnie Mae adds its guarantee to already- issued pass-through securities and CMOs that meet its standards. Loans underlying Fannie Mae and Freddie Mac securities must meet underwriting criteria prescribed by the GSEs for example, loan size, documentation, loan-to-value ratios, and so on.
Qualifying mortgages are assembled into pools according to specific pooling criteria set by Ginnie Mae. Upon approval, Ginnie Mae authorizes its transfer agent to create and deliver Ginnie Mae-guaranteed securities. The nature of the security guarantee depends on the agency. Fannie Mae and Freddie Mac generally guarantee timely payment of both principal and interest on their mortgage-backed securities whether or not the payments have been collected from the borrowers. Some private institutions — such as subsidiaries of investment banks, financial institutions, and real estate investment trusts — issue MBS not guaranteed by Ginnie Mae, Fannie Mae, or Freddie Mac.
Private label mortgage-backed securities are often assigned ratings by credit rating agencies based on their structure, issuer, collateral, documentation, any guarantees, and other factors. It is important to note that a private label MBS is the sole obligation of their issuer and is not guaranteed by any of the GSEs or the U.
With fixed-income securities like corporate or Treasury bonds, the purchase of a bond from an issuer is essentially a loan to the issuer in the amount of the principal, or face value, for a prescribed time period. Although MBS typically entitle investors to payments of principal and interest, they differ from corporate and Treasury securities in important ways. The cash flow on mortgage-backed securities may be somewhat irregular since the timing and speed of principal repayments by mortgage borrowers can vary.
Investors also will receive prepayments in some MBS when borrowers default on their loans. In the case of CMOs, investors receive these principal repayments according to the payment priorities of the class of securities they own. Prepayment assumptions are estimates of expected prepayments.
Average life is the average time that each dollar of principal in the pool is expected to be outstanding, based on certain prepayment assumptions. In the case of CMOs, some tranches are specifically designed to minimize the effects of a variable prepayment rate.
As is the case of all mortgage-backed securities, the average life of the security is always an estimate at best, depending on how closely the actual prepayment speeds of the underlying mortgage loans match assumptions. Movements in market interest rates may have a greater effect on mortgage-backed securities than on other fixed-interest obligations because interest rate movements also affect the underlying mortgage loan prepayment rates: as yields fall, homeowners are more likely to refinance or repay their loan more quickly, resulting in higher prepayment speeds and a shorter average life, while the reverse is true when yields rise.
If interest rates fall and prepayment speeds accelerate, mortgage- backed security investors may receive their principal back sooner than expected and have to reinvest it at lower interest rates call risk. If interest rates rise and prepayment speeds slow, investors may find their principal committed for a longer period of time, causing them to miss the opportunity to earn a higher rate of interest extension risk. Therefore, investors should carefully consider the effect that interest rate changes may have on the performance of their mortgage- backed security investment.
Mortgage-backed securities are often priced at a higher yield than Treasury and corporate bonds of comparable maturity, reflecting compensation for the uncertainty of their average lives as well as their potentially higher credit risk. The estimated yield on a mortgage-backed security reflects its estimated average life based on the assumed prepayment rates for the underlying mortgage loans.
If actual prepayment rates are faster or slower than anticipated, the investor holding the mortgage-backed security until maturity may realize a different yield and maturity:. Securities dealers make markets in mortgage-backed securities. A dealer will typically try to sell a bond for a higher price than the price at which it was acquired. Although there is a secondary market for many types of mortgage- backed securities, the degree of liquidity depends upon the characteristics of the individual security and can vary widely with economic and market conditions.
The interest portion of payments to mortgage securities investors is subject to federal, state, and local income tax. When comparing Treasury yields to mortgage security yields, one should keep in mind that interest income from Treasury securities is exempt from state and local income tax. Accrued interest. Active tranche. A CMO tranche that is currently paying principal payments to investors. Basis point. One one-hundredth.
Beneficial owner. Bid price. The price at which a buyer is willing to purchase a security. Bond equivalent yield. Call risk.
A multiclass bond backed by a pool of mortgage pass-through securities or mortgage loans. Companion tranche. Treasury securities and other fixed-income investments in two ways. Mortgage-backed securities generally provide a higher nominal yield than certain other fixed-income products due to this implicit call option.
Treasury securities. Freddie Mac guarantees the timely payment of interest and principal on all Gold PCs. However, for MBS security. Cash-out refinance programs are particularly susceptible to accelerated prepayment speeds, which is why Ginnie Mae is restricting the inclusion of such loans to custom MBS securities. This allows for greater market transparency for investors pricing Ginnie Mae securities.
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