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Bonds have their own unique terminology, and it is important to understand these words if you are to be a successful bond investor.

## Types of Cash Flow Streams

Accrued Interest
Accrued interest is the interest that has been earned, but not yet been paid by the bond issuer, since the last coupon payment. Note that interest accrues equally on every day during the period. That is, it does not compound. So, halfway through the period, you will have accrued exactly one-half of the period's interest payment. It works the same way for any other fraction of a payment period.
Banker's Year
A banker's year is 12 months, each of which contains 30 days. Therefore, there are 360 (not 365) days in a banker's year. This is a convention that goes back to the days when "calculator" and "computer" were job descriptions instead of electronic devices. Using 360 days for a year made calculations easier to do. This convention is still used today in some calculations such as the Bank Discount Rate that is used for discount (money market) securities.
Basis Point
A basis point is equal to 1/100th of 1%. You may hear that a bond yield changed by 10 basis points (bps), which means that it changed by 0.10%.
Bond
A bond is a debt instrument, usually tradeable, that represents a debt owed by the issuer to the owner of the bond. Most commonly, bonds are promises to pay a fixed rate of interest for a number of years, and then to repay the principal on the maturity date. In the U.S. bonds typically pay interest every six months (semi-annually), though other payment frequencies are possible. Bonds are issued by corporations, banks, state and local governments (municipal bonds), and the federal government (Treasury Notes and Bonds).
Call Date
Some bonds have a provision in the indenture that allows for early, forced, redemption of the bond, often at a premium to its face value. Bonds that have such a feature usually have a series of such dates (typically once per year) at which they can be called. This series of dates is referred to as the call schedule.
The extra amount that is paid by a bond issuer if the bond is called before the maturity date. This is a sweetener that is used to make callable bonds attractive to investors, who would otherwise prefer to own non-callable bonds.
Clean Price
The "clean price" is the price of the bond excluding the accrued interest. This is also known as the quoted price.
Coupon Payment
This is the actual dollar amount that is paid by the issuer to the bondholders at each coupon date. It is calculated by multiplying the coupon rate by the face value of the bond and then dividing by the number of payments per year. For example, a 10% coupon bond with semiannual payments and a $1,000 face value would pay$50 every six months.
Coupon Payment Date
The specified dates (typically two per year) on which interest payments are made.
Coupon Rate
The stated rate of interest on the bond. This is the annual interest rate that will be paid by the issuer to the owners of the bonds. This rate is typically fixed for the life of the bond, though variable rate bonds do exist. The term is derived from the fact that, in times past, bond certificates had coupons attached. The coupons were redeemed for cash payments.
Current Yield
A measure of the income provided by the bond. The current yield is simply the annual interest payment divided by the current market price of the bond. The current yield ignores the potential for capital gains or losses and is therefore not a complete measure of the bond's rate of return.
Dated Date
The dated date of a bond is the date on which it first begins to accrue interest. This is often the same as the issue date, but not always. If the settlement date is before the dated date, then the purchaser will pay the issuer the accrued interest for that amount of time. Of course, the purchaser will get a full coupon payment on the first coupon date, so the purchaser will get the accrued interest back at that time.
Day-count Basis
A method of counting the number of days between two dates. There are several methods, each of which makes different assumptions about how to count. 30/360 (a banker's year) assumes that each month has 30 days and that there are 360 days in a year. Actual/360 counts the actual number of days, but assumes that there are 360 days in a year. Actual/Actual counts the actual number of days in each month, and the actual number of days in a year. In Excel bond functions, 0 signifies 30/360, 1 specifies actual/actual, 2 is actual/360, 3 is actual/365 (which ignores leap days), and 4 represents the European 30/360 methodology.
Dirty Price
The "dirty price" is the total price of the bond, including accrued interest. This is the amount that you would actually pay (or receive) if you purchase (or sell) the bond.
Face Value
The principal of a bond is the notional amount of the loan. It is also called the principal or par value of the bond, and represents the amount that will be repaid when the bond matures.
Indenture
The legal contract between a bond issuer and the bondholders. The indenture covers such things as the original term to maturity, the interest rate, interest payment dates, protective covenants, collateral pledged (if any), and so on.
Make-whole Call Provision
A provision in the bond indenture that allows the issuer to call the bond on short notice by paying the bondholders the present value of the remaining cash flows. The present value is determined by adding a pre-specified premium (usually 15 to 50 basis points) to the yield on a comparable Treasury security.
Maturity Date
The date on which the bond ceases to earn interest. On this date, the last interest payment will be made, and the face value of the bond will be repaid. This is also sometimes known as the redemption date.
Redemption Value
This is typically the same as the face value of a bond. However, for a callable bond, it is the face value plus the call premium. In other words, this is the entire amount that will be received when the bond is redeemed by the issuer.
Required Return
The required return is simply the return that an investor believes he/she needs to earn in order to make an investment in a particular security. It is based on the perceived riskiness of the security, the rate of return available on alternative investments, and the investor's degree of risk aversion. It is likely that two investors looking at the same investment will have different required returns because of their differing risk tolerance. The required return, along with the size and timing of the expected cash flows, determines the value of the investment to the investor. Note that the required return is different from the yield (or promised rate of return), which is a function of the cost of the investment and the cash flows, and not of investor preferences.
Settlement Date
The date on which ownership of a security actually changes hands. Typically, this is several days after the trade date. In the US markets, the settlement date is usually 3 trading days after the trade date (this is known as T+3). For bonds, a purchaser begins to accrue interest on the settlement date.
Term to Maturity
The amount of time until the bond stops paying interest and the principal is repaid.
Yield to Call
Same as yield to maturity, except that we assume that the bond will be called at the next call date. Also known as yield to first call. Frequently, the yield to all call dates is calculated, and then we can find the worst-case, which is known as the yield to worst.
Yield to Maturity
The yield to maturity (YTM) of a bond is the compound average annual expected rate of return if the bond is purchased at its current market price and held to maturity. Implicit in the calculation of the YTM is the assumption that the interest payments are reinvested for the life of the bond at the same yield. The YTM is the internal rate of return (IRR) of the bond.
Yield to Worst
The lowest of all possible yields for the bond. It is calculated by determining the minimum of the yield to maturity or any of the various yields to call dates.