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Main Takeaways

Yield to maturity (YTM) is a way to determine how much money you can make from a bond if you hold it until it matures.
YTM considers the bond’s price, coupon rate, and time to maturity.
YTM is important for investors because it allows them to compare the true yields of different bonds, estimates the future value of their investment, and assess the risk of a bond.
Bond prices and YTM have an inverse relationship. When interest rates rise, bond prices fall, and their YTM increases. When interest rates fall, bond prices rise, and their YTM decreases.
Factors that affect bond prices and YTM include credit risk, inflation, and the bond’s maturity. Bonds with higher credit risk, longer maturities, and lower coupon rates typically offer higher yields to compensate for their risks.

Introduction
Bonds are debt instruments governments, corporations, and other organizations issued to raise funds. A bondholder receives a fixed interest payment, a coupon, at regular intervals until the bond matures. At maturity, the bond issuer repays the principal amount borrowed. The price of a bond is affected by several factors, including interest rates, credit risk, and the bond’s maturity. One important concept in bond investing is yield to maturity (YTM). This article will explore the relationship between bond prices and YTM.
What is Yield to Maturity (YTM)?
Yield to maturity (YTM) is a way to determine how much money you can make from a bond if you hold it until it matures. A bond is like an IOU – you loan money to a company or government, and they pay you back with interest. The YTM considers how much interest you’ll earn over time and how much you paid for the bond in the first place.
Here’s an example: Imagine you buy a bond for $1,000 with a coupon rate of 5%. That means you’ll earn $50 annually in interest payments (5% of $1,000). When the bond matures in 5 years, you’ll get the $1,000 back you paid for it. But what if you didn’t pay $1,000 for the bond? What if you bought it for a discount of $900 or a premium of $1,100 instead? The YTM calculation considers the actual price you paid for the bond and the interest payments you’ll receive to give you an idea of how much you can expect to earn if you hold the bond until it matures.
Knowing the YTM allows you to compare different bonds to see which ones are better. For example, if you’re trying to decide between two bonds with different interest rates and maturities, you can use YTM to determine which one will give you a higher return on your investment.
How is YTM Calculated?
Calculating yield to maturity (YTM) can be complex without using a financial calculator or spreadsheet software. However, here’s a simplified explanation using a simple example:
Let’s assume you have a bond that pays a coupon rate of 5% per year, has a face value of $1,000, and a maturity date of 5 years from now. Let’s also assume the bond’s current market price is $950.
To calculate YTM, you need to solve for the rate of return that makes the present value of the bond’s cash flows equal to its price.
Here’s how to do it step by step:
Calculate the present value of the bond’s future cash flows. In this example, the bond has five coupon payments of $50 ($1,000 x 5% coupon rate) each, plus the principal payment of $1,000 at maturity. The present value of these cash flows can be calculated using the following formula:
PV = C/(1+r)^1 + C/(1+r)^2 + C/(1+r)^3 + C/(1+r)^4 + C/(1+r)^5 + FV/(1+r)^5
where PV = present value, C = coupon payment, FV = face value, r = yield to maturity.
In our example, the present value of the cash flows is:
PV = $50/(1+r)^1 + $50/(1+r)^2 + $50/(1+r)^3 + $50/(1+r)^4 + $50/(1+r)^5 + $1,000/(1+r)^5
PV = $50/1.05 + $50/1.05^2 + $50/1.05^3 + $50/1.05^4 + $50/1.05^5 + $1,000/1.05^5
PV = $196.27
Calculate the yield to maturity (r) by solving for it in the formula. Since we know the present value of the cash flows ($196.27) and the bond’s price ($950), we can set up the equation:
$950 = $196.27/(1+r)^1 + $196.27/(1+r)^2 + $196.27/(1+r)^3 + $196.27/(1+r)^4 + $196.27/(1+r)^5 + $1,000/(1+r)^5
Solving for r using trial and error, we get a yield to maturity of approximately 6.47%.
So, in this example, if you hold the bond until maturity, you can expect a total return of 6.47% per year on your investment. Your YTM is higher than the 5% original coupon because you bought the bond at a discount to its face value (aka par value). Remember, at the maturity date, you will be paid $1,000, as that was the face value of the bond when it was issued. 
Relationship Between Bond Prices and YTM
When you buy a bond, you’re lending money to the bond issuer (like a government or corporation). In return for lending them money, they pay you interest (called the coupon rate) at regular intervals until the bond matures.
The YTM is a way to calculate the total return you would earn on a bond if you held it until it matures. It considers the bond’s price, coupon rate, and time to maturity. 
Now, the price of a bond and its YTM have an inverse relationship. This means that when the price of a bond goes up, its YTM goes down, and vice versa. This happens because newly issued bonds offer higher yields to attract investors when interest rates rise. This means that older bonds with lower yields become less attractive, causing their prices to fall and their YTM to rise. Similarly, when interest rates fall, bond prices rise, and their YTM decreases.
So, when interest rates rise, bond prices fall, and their YTM increases. When interest rates fall, bond prices rise, and their YTM decreases. Understanding this relationship is important for investors because it can help them make informed decisions when buying or selling bonds.
Factors Affecting Bond Prices and YTM
Apart from interest rates, several other factors affect bond prices and YTM. These include credit risk, inflation, and the bond’s maturity. Bonds with higher credit risk, such as those issued by companies with poor credit ratings, offer higher yields to compensate investors for the increased risk of default. Inflation erodes the purchasing power of a bond’s fixed interest payments, making them less attractive to investors. Finally, the longer the bond’s maturity, the greater the risk it carries, which means investors demand a higher yield to compensate for that risk.
Here are the three main factors that will affect bond prices and yield to maturity with a bit more detail:
Credit risk: refers to the risk of the bond issuer defaulting on the bond, which means they fail to make the required payments. If the bond issuer has a high credit risk, meaning they have a higher chance of defaulting, the bond will be riskier and need a higher yield to compensate for that risk. For example, a company with a poor credit rating issues a bond with a 5% coupon rate. Another company with a better credit rating may issue a bond with a 3% coupon rate. In this case, the bond with the higher credit risk will need to offer a higher yield to attract investors, which means it will have a higher YTM.
Inflation is the rate at which the general price level of goods and services in an economy is increasing. Inflation erodes the purchasing power of a bond’s fixed interest payments, making them less attractive to investors. If the inflation rate exceeds the bond’s coupon rate, the investor will lose money on the investment. For example, if a bond has a 3% coupon rate and inflation is at 4%, the investor’s real return after adjusting for inflation will be negative. As a result, the bond will need to offer a higher yield to compensate for the inflation risk.
Maturity: The maturity of a bond refers to the length of time until the bond reaches its maturity date, at which point the bond issuer repays the principal amount borrowed. Bonds with longer maturities are riskier because there is a greater chance that interest rates will change during that time, which can affect the bond’s price and yield. As a result, bonds with longer maturities will typically offer higher yields to compensate for that risk. For example, a 30-year bond will typically have a higher yield than a 5-year bond with the same coupon rate, all other factors being equal.
Importance of YTM in Bond Investing
YTM is important in bond investing because it helps investors determine a bond’s true yield, which considers its price, coupon rate, and time to maturity. This means that when comparing different bonds, they can use YTM to compare their true returns rather than just looking at the bond’s coupon rate or current yield.
For example, you are considering two bonds: Bond A and Bond B. Bond A has a coupon rate of 4% and a YTM of 4%, while Bond B has a coupon rate of 5% and a YTM of 4%. At first glance, it might seem like Bond B is the better investment because it has a higher coupon rate. However, when you look at the YTM, you can see that Bond A has the same return as Bond B. This is because Bond A is priced lower than Bond B, so its yield is higher to compensate for the lower price.
Another reason YTM is important is that it allows investors to estimate the future value of their investment if held until maturity. Let’s say you are considering buying a bond with a YTM of 5%. If you hold that bond until maturity, you can expect to earn a total return of 5%. This can help you make informed decisions about investing in a particular bond.
In addition, YTM helps investors assess the risk of a bond. Bonds with higher YTM generally have a higher level of risk because they offer a higher return to compensate for that risk. Understanding the relationship between risk and return is crucial in making investment decisions.
Overall, YTM is a key concept in bond investing because it helps investors make informed decisions by comparing the true returns of different bonds, estimating the future value of their investment, and assessing the risk of a bond.
Conclusion
Bond prices and YTM have an inverse relationship that is affected by several factors, including interest rates, credit risk, inflation, and maturity. YTM is an important concept in bond investing because it helps investors determine the true yield of a bond, which takes into account its price, coupon rate, and time to maturity. By understanding YTM, investors can compare the yields of different bonds and make informed decisions when investing in bonds. Overall, YTM is an essential tool for bond investors, and mastering this concept can help investors maximize their returns and minimize their risks.
FAQs

What is the difference between YTM and current yield?

Current yield is the annual income from a bond divided by its current market price. It does not take into account the bond’s time to maturity. YTM, on the other hand, considers the bond’s price, coupon rate, and time to maturity and is a more accurate measure of a bond

Can YTM change over time?

Yes, YTM can change over time. This is because the market price of a bond fluctuates in response to changes in interest rates and other factors. As the bond’s price changes, so does its yield to maturity.

Why is YTM important for investors?

YTM is important for investors because it allows them to compare the yields of different bonds with different maturities and coupon rates. Moreover, YTM helps investors estimate the future value of their investment if held until maturity.

How does credit risk affect YTM?

Bonds with higher credit risk offer higher yields to compensate investors for the increased risk of default. This means that bonds issued by companies with poor credit ratings will have higher YTM than those with high credit ratings.

Is YTM the same as yield to call?

No, YTM is not the same as yield to call. Yield to call is a bond’s yield if it is called before its maturity date. This typically occurs when interest rates fall, and the issuer can refinance the bond at a lower rate. Yield to call is only relevant for bonds with call provisions.