Zero-Coupon Bonds: Definition, Formula, Example, Advantages, and Disadvantages

What are Zero-Coupon Bonds?

A zero-coupon bond can be described as a financial instrument that does not render interest. They normally trade at high discounts, and offer full face par value, at the time of maturity.

The spread between the purchase price of the bond and the price that the bondholder receives at maturity is described as the profit of the bondholder.

Normally in the case of bonds, some of them are issued as zero-coupon instruments right from the beginning.

However, some bonds also transform into zero-coupon bonds after they are restructured and repackaged by the owner. Zero-Coupon bonds also fluctuate a lot in prices, as compared to normal bonds.

How do Zero-Coupon Bonds work?

As mentioned earlier, zero-coupon bonds do not render interest payments. The only sort of profit, or interest payment is generated at the end of the term, when the bond actually matures.

Hence, the difference between the purchase price of the bond, and the face value of the bond tends to be the profit.

The greatest incentive for zero-coupon bondholders is the fact that they are predictable. Once the purchase is made, they know for sure that they would be getting the face value of the bond, which would be their profit. Therefore, they are certain of their profit, even before the bond matures.

In the same manner, for bonds that have a relatively shorter maturity duration, investors do not need to worry about the market fluctuation, since the bond’s face value is not contingent on market fluctuations.

Formula for Zero-Coupon Bonds

The price of zero-coupon bonds is calculated using the formula given below:

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Price = M / (1 + r) ^ n, where

M = maturity value of the bond. (In other words, the face value of the bond)

R = required rate of return (or interest rate)

N = number of years till maturity

These bonds can either offer annual compounding or semi-annual compounding. In the case where the bonds offer semi-annual compounding the following formula is used to calculate the price of the bond:

Price = M / (1 + r/2) ^ n*2  

Examples of Zero-Coupon Bonds

Calculating the price of zero-coupon bonds varies on whether the bonds offer annual compounding or semi-annual compounding. The calculation of price of a bond is given in two illustrations below:

  • Annual Compounding Bonds

Mr. Tee is looking to purchase a zero-coupon bond that has a face value of $50 and has 5 years till maturity. The interest rate on the bond is 2% and will be compounded annually.

In the scenario above, the face value of the bond is $50. However, to calculate the price that needs to be paid for the bond today, the following formula is used:

Price of the bond = M / (1 + r) ^ n = 50 / (1+0.02) ^5 = $45.287

Therefore, $45.3 is the amount that Mr.Tee is going to pay for the bond today. 

  • Semi-Annual Compounding Bonds

Mr. Tee is looking to purchase a zero-coupon bond that has a face value of $50 and has 5 years till maturity. The interest rate on the bond is 2% and will be compounded semi-annually.

 In this scenario, the face value is also $50, but the only difference is the fact that interest is going to be compounded semi-annually. Therefore, the price of the bond today will be calculated using the following formula:

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 Price = M / (1 + r/2) ^ n*2 = 50 / (1 + 0.02/2) ^ 10 = $45.264

Advantage of Zero-Coupon Bonds

From an investor’s perspective, zero coupon bonds have the following advantages:

  • They are safe investment instruments, and have a lower element of risk involved.
  • Long Dated zero coupon bonds are said to be the most responsive to interest rate fluctuations. Therefore, in case of longer time duration (a higher ‘N’), it might prove to be profitable for the bond holder.

Disadvantages of Zero-Coupon Bonds

However, there are also certain drawbacks of zero-coupon bonds that need to be included in the analysis:

  • With zero-coupon bonds, the bondholders need to pay taxes associated with interest income, regardless of the fact that the particular gain has been realized or not. For example, with a bond that is maturing in 5 years, the lump sum return is going to be generated at the end of the period only. However, the bondholder is required to pay taxes, regardless of the time to maturity.
  • They are harder to liquidate in the secondary market. Therefore, for investors for whom liquidity is a preference, this might not be the ideal option for them.
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