## Introduction

When you buy a bond, you are lending money to the issuer, who agrees to pay you back the principal plus interest. The interest payments are usually made twice a year. The rate of interest is fixed for the life of the bond, and is known as the coupon rate.

If you hold the bond until it matures, you will receive all your interest payments plus your principal back. However, if you sell the bond before it matures, the price you receive will be based on current market conditions.

The amount of interest that you earn on a bond is known as the yield. Yield is calculated by taking into account the coupon rate, the length of time until maturity, and the market price of the bond. If you hold a bond to maturity, your yield will be equal to the coupon rate. However, if you sell before maturity, your yield will be different depending on market conditions.

Simple interest is a type of yield that is typically used for bonds that have a short term to maturity (less than one year). With simple interest, you only earn interest on the principal amount of the loan – there are no compound interest payments.

## What is simple interest?

Simple interest is the amount of interest that accrues on a loan or deposit over a period of time, without accounting for compounding. In other words, simple interest is calculated only on the principal amount of the loan or deposit. Compound interest, by contrast, is calculated on both the principal and any accrued interest.

Find more on bonds here: what is a bond coupon? for example.

## How is simple interest related to bonds?

Simple interest is the most basic type of interest. When you hear the word interest, simple interest is probably what first comes to mind. It’s easy to calculate, which is why it’s called “simple” interest. With simple interest, you simply multiply the interest rate by the number of years you’re borrowing the money.

### The time value of money

The time value of money is the concept that money is worth more now than it will be in the future. This is because money can be invested and earn interest, so it has the potential to grow in value. The time value of money is an important concept in bond investing, because bonds are loans and they typically have a fixed interest rate. This means that the payments you receive from a bond are worth more now than they will be in the future.

In order to understand the time value of money, it is important to first understand the concept of present value. Present value is the amount of money that would need to be invested today in order to have a certain amount of money at a future date. For example, let’s say you wanted to have $10,000 five years from now. In order to achieve this, you would need to invest $7,500 today at 5% interest. The $7,500 is the present value of your future $10,000.

Now let’s say you want to buy a bond that pays $100 per year for 10 years and has a 5% interest rate. If we assume that inflation is 3%, then the real return on this bond would be 2% ((5% – 3%) = 2%). This means that your $100 annual payments would be worth less in each successive year because inflation will reduce the purchasing power of your money. In other words, your payments will not keep up with inflation.

However, since bonds typically have fixed interest rates, the payments you receive will still be worth more in each successive year when discounted for inflation. This is because you will be receiving a higher interest payment than what you could get if you invested in something else that only provided a return equal to inflation (such as government bonds). This difference between the interest rate on your bond and inflation is known as the real rate of return. The higher the real rate of return, the greater the time value of your bond payments.

### The relationship between bonds and interest rates

The relationship between bonds and interest rates is a complicated one, but it boils down to this: when interest rates go up, bond prices go down, and when interest rates go down, bond prices go up.

This happens because bonds are essentially loans, and when interest rates go up, the amount of money that you can earn by lending money goes up as well. So if you have a bond that you bought when interest rates were lower, it will be worth less when interest rates go up.

Conversely, when interest rates go down, the amount of money you can earn from lending money goes down as well. So if you have a bond that you bought when interest rates were higher, it will be worth more when interest rates go down.

## Conclusion

Finally, it’s important to remember that simple interest is only one aspect of bond investing. Other factors, such as the creditworthiness of the issuer and the market conditions at the time of purchase, can also affect your investment.

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