Investor Corner/The asset classes/Debt Concepts
2.2.3 Yield to Maturity (YTM)
Yield to maturity is the total annualised return you would earn by buying a bond today and holding it until it matures, assuming every interest payment is made on schedule and reinvested at the same rate.
A single number capturing the whole picture
YTM accounts for three things at once: the coupon payments you will receive, any difference between the price you paid and the face value you will get back, and the time remaining until maturity. It is the standard way to compare bonds that have different coupons, prices and maturities on a like-for-like basis.
YTM is the total annualised return an investor earns if they buy a bond at the current market price, hold it until maturity, and receive all coupon payments on time. It accounts for the coupon payments, the difference between the purchase price and face value (capital gain or loss at maturity), and the time value of money. It is the bond's equivalent of XIRR for a mutual fund: a single number that captures the complete return picture.
For example, a bond with a face value of ₹1,000, a 7% coupon, five years to maturity, and a market price of ₹950 has a YTM of approximately 8.2%. The extra return above the coupon comes from the ₹50 capital gain that will be realised when the bond matures at ₹1,000. YTM compresses coupon income, capital gain and time value into one comparable number, which is why it is the standard metric for comparing bonds of different coupons, prices and maturities.
The assumption baked into the number
YTM assumes that every coupon received along the way is reinvested at the same rate as the YTM itself. In practice, interest rates change over time, so this precise assumption rarely holds exactly. YTM is still the most useful single figure for comparing bonds, provided this simplification is kept in mind rather than treated as a guarantee.
The key assumption embedded in YTM is that all coupon payments are reinvested at the same YTM rate for the remaining life of the bond. In practice, this almost never happens exactly because interest rates change over time. If rates fall, coupons are reinvested at lower rates, and the realised return will be slightly below the YTM. If rates rise, coupons are reinvested at higher rates, and the realised return will be slightly above. This reinvestment risk is small for short-maturity bonds but becomes meaningful for long-maturity bonds with high coupons, where a large proportion of the total return comes from reinvested coupons rather than the final principal repayment.
Where it is used
Fund factsheets for debt mutual funds typically quote the portfolio's average YTM, giving a reasonable estimate of the return an investor might expect if the underlying bonds were held to maturity and rates stayed roughly stable. Actual fund returns will still differ from this figure because funds continually buy and sell holdings rather than holding every bond to maturity.
How PriLytics helps. PriLytics computes the actual XIRR earned on every debt holding you own, based on the real cash flows in and out, rather than a theoretical estimate. See how returns are calculated.
In the context of debt mutual funds, the portfolio YTM is reported in the monthly factsheet and is the best single indicator of the fund's expected return over the next one to two years, assuming no major credit events and roughly stable interest rates. Comparing the portfolio YTM across funds in the same category gives a clearer picture of relative value than comparing past returns, which reflect rate movements and credit events that may not recur.