Yield to Maturity (YTM)
Key Takeaways
- YTM is the total annualized return expected if a bond is held to maturity
- Accounts for coupon payments, current price, par value, and time to maturity
- The standard measure for comparing bonds of different coupons and maturities
- YTM assumes all coupons are reinvested at the same rate
Definition
Yield to maturity (YTM) is the total return an investor can expect to earn if a bond is held until its maturity date, assuming all coupon payments are reinvested at the same rate. YTM accounts for the bond's current market price, par value, coupon rate, and time to maturity, making it the most comprehensive measure of a bond's expected return.
YTM is effectively the internal rate of return (IRR) of a bond investment. It is the discount rate that makes the present value of all future cash flows (coupons + par value at maturity) equal to the bond's current market price. YTM is the standard metric used to compare bonds with different coupon rates, maturities, and prices.
If a bond is purchased at par ($1,000), YTM equals the coupon rate. If purchased at a discount (below par), YTM is higher than the coupon rate. If purchased at a premium (above par), YTM is lower than the coupon rate.
How It Works
The YTM formula solves for the rate (r) in: Price = Σ [Coupon / (1+r)^t] + [Par / (1+r)^n], where t is each period and n is the total periods. This equation cannot be solved algebraically and requires iterative calculation, which is why financial calculators and spreadsheets are used.
For a simplified approximation: YTM ≈ [Coupon + (Par - Price) / Years to Maturity] / [(Par + Price) / 2]. For example, a bond with a 5% coupon, $1,000 par, $950 price, and 10 years to maturity: YTM ≈ [$50 + ($1,000-$950)/10] / [($1,000+$950)/2] = $55 / $975 = 5.64%.
YTM has an important assumption: all coupons are reinvested at the YTM rate. In reality, reinvestment rates vary over time. For this reason, YTM is an expected return, not a guaranteed return. Reinvestment risk is a real concern, especially for long-maturity bonds.
Example
An investor is comparing two bonds: Bond A has a 6% coupon, 10 years to maturity, and is priced at $1,050. Bond B has a 4% coupon, 10 years to maturity, and is priced at $920. Bond A's YTM is approximately 5.44%, while Bond B's YTM is approximately 4.98%. Despite Bond A's higher coupon, the premium price reduces its total return. Bond A still offers the higher YTM, but the comparison is much closer than the coupon rates alone would suggest.
Why It Matters
YTM is the standard language for comparing bond returns and is essential for building fixed-income portfolios. Without YTM, it would be impossible to fairly compare bonds with different coupons, maturities, and prices. YTM tells you the actual expected annual return, accounting for all factors.
For investors, YTM is the starting point for evaluating whether a bond offers adequate compensation for its risk. Comparing a corporate bond's YTM to a Treasury bond's YTM of the same maturity reveals the credit spread — the additional yield for taking credit risk.
Advantages
- Most comprehensive measure of a bond's expected total return
- Enables fair comparison across bonds with different features
- Accounts for price premium or discount relative to par
- Industry standard used by all bond market participants
Limitations
- Assumes all coupons reinvested at the YTM rate — unrealistic in practice
- Does not account for credit risk or potential default
- Assumes the bond is held to maturity — early sale may produce different returns
- Complex calculation requiring financial calculator or software
Frequently Asked Questions
Related Terms
Browse more definitions in the financial terms glossary.