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Yield to Maturity (YTM) is a measure used to estimate the annualised rate of return implied by a bond's current market price and its expected future cash flows when held until maturity.
A bond has a coupon rate, a maturity date, and a market price. These three factors do not always point to the same return. This is where Yield to Maturity (YTM) becomes useful.
YTM is the discount rate that makes the present value of a bond's future cash flows equal to its current market price. It provides a standardised way to view the return implied by a bond's price, periodic coupon payments, and maturity repayment.
Keep reading to learn how YTM works, how it is widely used, its role in debt funds and bonds, and more.
Key Takeaways
- YTM stands for Yield to Maturity and represents the discount rate implied by a bond's current market price and future cash flows.
- It factors in the bond's coupon payments, purchase price, and face value at maturity.
- A bond trading below its face value has a YTM higher than its coupon rate.
- A bond trading above its face value has a YTM lower than its coupon rate.
- Portfolio YTM changes daily as underlying bond prices shift, portfolio holdings change, and daily inflows and outflows require new bond purchases.
What is Yield to Maturity?
Yield to Maturity is the discount rate that equates the current market price of a bond with the present value of all its expected future cash flows, assuming the bond is held until maturity and all contractual payments are made as scheduled.
Those future cash flows generally include:
- Periodic coupon payments (interest income)
- Repayment of the principal or face value at maturity
YTM looks beyond the face-value coupon rate to reflect what an investor actually pays in the market.
Suppose a bond has a face value of ₹1,000 and pays a 7% annual coupon. Its coupon payment is ₹70 a year.
If the bond trades at ₹950, the investor buys it at a discount to face value. In addition to receiving the coupon, the investor could potentially gain ₹50 if the bond is held until maturity and the principal is repaid at ₹1,000. This price difference directly increases the YTM above the 7% coupon rate.
How Does YTM Work?
Consider a bond with:
- Face value: ₹1,000
- Coupon rate: 8%
- Annual coupon: ₹80
- Maturity: 5 years
Now assume the bond is trading at ₹950.
The investor pays ₹950 but will receive ₹80 each year and ₹1,000 at maturity, assuming the issuer makes all payments as scheduled.
The investor has two components in the expected return:
- Coupon income + potential gain from buying below face value
YTM brings these cash flows together and expresses the implied return as an annual rate.
If the same bond trades at ₹1,050 instead, the investor pays more than the amount that will be received at maturity. So, the YTM would be lower.
YTM Formula
For a bond with periodic coupon payments, the basic relationship can be represented as:
Bond Price = C₁/(1+YTM)¹ + C₂/(1+YTM)² + ... + Cₙ/(1+YTM)ⁿ + F/(1+YTM)ⁿ
Where:
- Bond Price = current market price
- C = coupon payment
- F = face value or maturity value
- n = number of payment periods
- YTM = Yield to maturity per payment period
Note: In the formula, YTM represents the yield per payment period. For a semi-annual coupon bond, use semi-annual coupon payments and semi-annual periods. The resulting periodic yield can then be annualised under the applicable market convention.
Why Does YTM Change?
YTM changes primarily because the market price of a bond fluctuates in response to prevailing interest rates, inflation expectations, and credit risk assessments.
Suppose a bond has a face value of ₹1,000 and a fixed coupon of ₹70.
If the market price falls to ₹950, the investor is paying less for the same future coupon payments and maturity value. The YTM rises.
If the market price increases to ₹1,050, the investor pays more for those same future cash flows. The YTM falls.
This gives rise to an important relationship: Bond prices and yields move in opposite directions.
Bond Price and YTM: An Example
Take a bond with a face value of ₹1,000 and an annual coupon of ₹80.
|
Market Price |
Bond Status |
Annual Coupon |
Effect on YTM |
|
₹900 |
Discount |
₹80 |
YTM > Coupon Rate (Higher yield due to capital appreciation at maturity) |
|
₹1,000 |
Par |
₹80 |
YTM = Coupon Rate (Yield equals the 8% coupon rate) |
|
₹1,100 |
Premium |
₹80 |
YTM < Coupon Rate (Lower yield due to capital loss at maturity) |
The coupon remains ₹80 in each case. What changes is the price paid by the investor.
This is why looking only at the coupon rate can give an incomplete picture of a bond's return.
Coupon Rate vs YTM
|
Feature |
Coupon Rate |
Yield To Maturity (YTM) |
|
Basis |
Fixed percentage of the bond's face value |
Calculated relative to the bond's current market price |
|
Cash Flow Focus |
Reflects only the periodic interest payments |
Reflects periodic interest payments plus maturity gain or loss |
|
Price Sensitivity |
Remains fixed for fixed-rate bonds |
Changes continuously as market prices fluctuate |
|
Return Coverage |
Does not account for purchase price or capital gains/losses |
Provides a single annualised rate implied by the full cash flow schedule |
YTM vs Current Yield
YTM is also different from current yield. Current yield simply compares the annual coupon payment with the current market price.
Current Yield = Annual Coupon / Current Market Price × 100
Suppose a bond pays ₹80 a year and trades at ₹950.
Its current yield would be:
₹80 / ₹950 × 100 = 8.42%
This does not include the gain that may arise from the bond moving from ₹950 towards its ₹1,000 maturity value.
YTM takes that maturity value into account.
|
Current Yield |
YTM |
|
Looks at annual coupon income against current price |
Considers coupon income and maturity value |
|
Simpler calculation |
More comprehensive calculation |
|
Does not account for the gain or loss from holding to maturity |
Accounts for the difference between purchase price and maturity value |
|
Useful as a quick yield measure |
More useful for comparing the return implied by a bond's full cash flows |
YTM in Debt Mutual Funds
A debt fund’s portfolio YTM is an indicative measure of the yield implied by its current holdings and prices. It is not a forecast of investor returns.
Why Portfolio YTM Differs from Actual Investor Returns:
-
Static Snapshot: Portfolio YTM changes daily as underlying bond prices shift, portfolio holdings change, and daily inflows/outflows occur requiring new bond purchases.
-
Fund Overhead: It does not account for fund expenses (Expense Ratio), portfolio turnover costs, or trading friction.
-
Credit & Market Risk: It does not account for potential defaults, credit rating downgrades, liquidity costs, or future market movements.
-
Strategy Limitations: Portfolio YTM is especially less meaningful for funds with short-duration instruments, dynamic asset allocation, or active credit strategies.
Note: Portfolio YTM is generally more useful for comparing funds with similar duration, credit quality, and portfolio strategy than as a standalone return estimate.
Is YTM the Return an Investor Will Earn?
YTM is a discount-rate measure, not a guaranteed realised return. Actual returns can differ from YTM for these reasons:
-
Holding Period: If an investor sells the bond before maturity, the return will depend on the market price at the time of sale.
-
Reinvestment rate: If coupons are reinvested, the actual compound return depends on the rates at which they are reinvested. If market rates fall, coupons are reinvested at lower rates and the realised return can be lower than YTM; if rates rise, it can be higher. Some textbooks describe YTM as assuming coupons are reinvested at the YTM rate; strictly, the calculation itself equates the present value of promised cash flows to the bond price.
-
Credit Risk: YTM assumes the issuer makes all coupon and principal payments as scheduled.
Advantages of Using YTM
-
More complete than coupon rate: Includes both periodic coupon payments and the capital gain or loss resulting from the difference between the purchase price and maturity value.
-
Useful for comparison: Provides a standardised, annualised yield metric that allows direct comparison across bonds with different coupons, prices, and maturities.
-
Reflects market price: Changes dynamically as the bond's market price fluctuates in response to interest rate movements.
-
Useful in debt analysis: Helps investors evaluate individual fixed-income securities as well as overall debt portfolios.
-
Easy to track: Widely published and reported standard yield metric across debt securities and mutual fund portfolio factsheets.
Limitations of YTM
-
Not a guaranteed return: The actual compound return realised by an investor depends on the holding period, prevailing market prices at the time of sale, and coupon reinvestment rates.
-
Reinvestment assumption variance: Interim coupon payments may be reinvested at prevailing market rates that turn out to be higher or lower than the initial YTM rate.
-
Default risk remains: Standard YTM calculations assume all scheduled payments will be made and do not remove or quantify underlying credit default risk.
-
Dynamic portfolio shifts: In debt mutual funds, portfolio YTM fluctuates constantly with daily market prices and does not account for fund expense ratios or portfolio turnover costs.
Conclusion
Yield to Maturity is one of the most useful measures for understanding the return implied by a bond's current market price. Unlike the coupon rate, YTM considers the bond's price, coupon payments and maturity value together. For debt mutual funds, portfolio YTM provides an indicative yield benchmark for comparing similar funds, but it should not be treated as a forecast or guarantee of actual investor returns.
