Important facts to remember about yield to maturity
If you sell a bond before it matures, your effective yield
could be different from its yield to maturity.
The yield to maturity calculation assumes you reinvest the
coupon payments at that same yield rate. If you spend those interest payments,
or if interest rates fall, you wouldn't be able to get the same yield when you
reinvest your interest payments. That would mean your actual yield could be
less than the yield to maturity percentage.
All investing involves risk, including the potential loss of principal, and there is no guarantee that a bond will be worth what you paid for it when you sell. Specific risks associated with bonds include interest rate risk (potential loss of value from a rise in interest rates), inflation risk (decline in the purchasing power of a bond's interest payments), liquidity risk (difficulty selling a bond), and default risk (if the issuer defaults on payments or repayment of principal).   Understanding Bond Yields and the Yield Curve
When it comes to investing in bonds, one of the first
factors to consider is yield. But what exactly is "yield?" The answer depends
on how the term is being used. In the broadest sense, an investment's yield is
the return you get on the money you've invested. However, there are many
different ways to calculate yield. Comparing yields can be a good way to
evaluate bond investments, as long as you know what yields you're comparing and
why.
Current yield
People sometimes confuse a bond's yield with its coupon rate
(the interest rate that is specified in the bond agreement). A bond's coupon
rate represents the amount of interest you earn annually, expressed as a
percentage of its face (par) value. If a $1,000 bond pays $50 a year in
interest, its coupon rate would be 5%.
Current yield is a bit different. It represents those annual
interest payments as a percentage of the bond's market value, which may be
higher or lower than par. As a bond's price goes up and down in response to
what's happening in the marketplace, its current yield will vary also. For
example, if you were to buy that same $1,000 bond on the open market for $900,
its current yield would be 5.55% ($50 divided by $900).
If you buy a bond at par and hold it to maturity, the
current yield and the coupon rate are the same. However, for a bond purchased
at a premium or a discount to its face value, the yield and the coupon rate are
different.
If you're concerned only with the amount of current income a
bond can provide each year, then calculating the current yield may give you
enough information to decide whether you should purchase that bond. However, if
you're interested in a bond's performance as an investment over a period of
years, or want to compare it to another bond or some other incomeproducing
investment, the current yield will not give you enough information. In that
case, yield to maturity will be more useful.
Yield to maturity
Yield to maturity is a more accurate reflection of the
return on a bond if you hold it until its maturity date. It takes into account
not only the bond's interest rate, principal, time to maturity, and purchase
price, but also the value of the interest payments as you receive them over the
life of the bond.
If you buy a bond at a discount to its face value, its yield
to maturity will be higher than its current yield. Why? Because in addition to
receiving interest, you would be able to redeem the bond for more than you paid
for it. The reverse is true if you buy a bond at a premium (more than its face
value). Its value at maturity would be less than you paid for it, which would
affect your yield.
Example:
If you paid $960 for a $1,000 bond and held
it to maturity, you would receive the full $1,000 principal. That $40 profit is
included in the calculation of a bond's yield to maturity. Conversely, if you
bought the bond at a $40 premium, meaning you paid $1,040 for it, that premium
would reduce the bond's yield because the bond would be redeemed for $40 less
than its purchase price. Yield to maturity lets you accurately compare bonds with
different maturities and coupon rates. It's particularly helpful when you're
comparing older bonds being sold in the secondary market that are priced at a
discount or at a premium rather than at face value. It's also especially
important when looking at a zerocoupon bond, which typically sells at a deep
discount to its face value but makes no periodic interest payments. Because all
of a zero's return comes at maturity, when its principal is repaid, any yield
quoted for a zerocoupon bond is always a yield to maturity.
Note:
Because zerocoupon bonds do not pay interest until maturity, their prices tend to be more volatile than bonds that pay interest regularly. Interest income is subject to ordinary income tax each year, even though the investor does not receive any income payments. Bonds sold prior to maturity may be worth more or less than their original cost. Yield to call
When it comes to helping you estimate your return on a
callable bond (one whose issuer can choose to repay the principal before
maturity), yield to maturity has a flaw. If the bond is called, the par value
will be repaid and interest payments will come to an end, thus reducing its
overall yield to the investor. Therefore, for a callable bond, you also need to
know what the yield would be if the bond were called at the earliest date
possible. That figure is known as its yield to call. The calculation is the
same as with yield to maturity, except that the first call date is substituted
for the maturity date.
A bond issuer will generally call a bond only if it's
profitable for the issuer to do so. For example, if interest rates fall below a
bond's coupon rate, the issuer is likely to recall the bond and borrow money at
the new, lower rate. The larger the spread between current interest rates and
the original coupon rate, and the earlier the first date the bond can be
called, the more important yield to call becomes.
Aftertax yield
It's also important to consider a bond's aftertax
yield: the rate of return after taking into account taxes (if any) on the
income received. A taxexempt bond typically pays a lower interest rate than its
taxable equivalent, but may have a higher aftertax yield, depending on your
tax bracket and state tax laws.
Example:
Bond A is a taxexempt bond paying 4%; Bond B is a taxable
bond paying 6%. For purposes of this illustration,
let's say you're in the 35% federal tax bracket and pay
no state taxes. Bond A's aftertax yield is 4%, but Bond B's yield is only 3.9% once taxes have
been deducted. Bond A has a higher aftertax yield. Note that in some states you will have to pay income tax if you buy bonds that have been issued by other states. In addition, while municipal bonds are not subject to federal income taxes, they may be subject to federal, state, or local alternative minimum taxes. If you sell a taxexempt bond at a profit, there are capital gains taxes to consider. Watching the yield curve
Bond maturities and their yields are related. Typically,
bonds with longer maturities pay higher yields. Why? Because the longer a
bondholder must wait for the bond's principal to be repaid, the greater the
risk compared to an identical bond with a shorter maturity, and the more reward
investors demand.
On a chart that compares the yields of, say, Treasury
securities with various maturities, you would typically see a line that slopes
upward as maturities lengthen and yields increase. The greater the difference
between short and long maturities, the steeper that slope. A steep yield curve
often occurs when investors expect a fastergrowth economy and rising interest
rates; they want greater compensation for tying up their money for longer
periods. A flat yield curve means that economic projections are relatively
stable, so there is little difference between short and long maturities.
Examples of Yield Curves Sometimes the yield curve can become inverted when
shortterm interest rates are higher than longterm rates. For example, in 2004
the Federal Reserve Board began increasing shortterm rates, but longterm
rates didn't rise as quickly. A yield curve that stays inverted for a period of
time is believed to indicate that a recession is likely to occur soon.
