In economics yield to mature is the internal rate of return from the flows of cash of fixed income security, especially from bonds. Yield is paid if the bonds or other securities are to be help until their maturity. Simply saying, yield to maturity is a measurement of the return from the bonds. It is necessary to note that yield to maturity gives investors the opportunity to calculate the fair value of financial instruments. Yield to maturity applies exactly to a zero coupon bond. The reason is that this bond has no interest to be reinvested. (Yield to Maturity: Definition)
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It is apparent that calculation of yield to maturity is the same as the calculation of the rate of return:

If the current yield of the bond is less that its yield to maturity, then the bond will be sold at a discount.

If the current yield of the bond is more that yield to maturity, then the bond will be sold at a premium.

If the current yield of the bond equals its yield to maturity, then such bond will be sold at a par. (Yield to Maturity: Definition)
When the bond is issued and is being traded in the security market, the only varying thing is bond's price. If a person buys such bond, his yield to maturity will increase on his investments. It is a matter of fact that different bonds have different characteristics and therefore there are several possible variants of yield to maturity:

Yield to call means that the bond is callable and can be purchased by the issuer even before maturity takes place. When the bond is callable the market tends also to look to the yield to call. But market may assume that bond can be possible called. On yield to call the cash flow is shortened.( Yield to Maturity)

Yield to put means the same as yield to call, but the main difference is that the holder of the bond wants to sell the bond back to its issuer at a set price and only on specified date.

Yield to worst means that the bond is callable, "puttable" and has other additional features. It is known that yield to worst is the lowest of yield to maturity. (Yield to Maturity)
Yield to maturity assumes that all interests and dividends are reinvested. It takes also into account losses and gains in case of difference between the purchase and redemption price. Economists say that yield to maturity is a projection of future performance, because yield to maturity has to assume a reinvestment and the rate of yield to maturity itself. In other words, yield to maturity "an implicit function that can only be evaluated by the method of successive approximations". To achieve the quoted yield to maturity is easy when a zero coupon bond is to be help until maturity. Yield to maturity is mostly quoted in terms of "bondequivalent yield". (Yield to Maturity)
For example, let's consider a zero coupon bond that is 30 years. Its face value would be $100. The bond would cost $5.73 today if it is priced at a yield to maturity of 10%. The annualized return would be 10% over the thirty years, because the price would advance to $100. It is necessary to outline what is happening meantime. Let's suppose that during first 10 years the interest rates would decline. In the result the yield to maturity would fall to 7%.
After 20 years of maturity the bond price would be $25.84. Nevertheless even in such situation the yield to maturity for bond would be just 7%. The bargained yield to maturity for the moment of bond buying was 10%, the earned return over the 10 years would be 16.26%. But it doesn't mean that the bond holder will earn 16.26 annually over the remaining 20 years. His annual income would be only 7%. It will be found that over the 30 years period the annual return would be 10%. (Bond Yield to Maturity)
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