Yield to maturity (YTM) is the annualized total return on a bond if held to maturity — integrating purchase price, scheduled coupon payments, and final principal repayment into a single rate.

How it works

Bonds trade above or below face value as interest rates and credit risk shift. Coupon rate alone misleads: a bond with a 6% coupon bought at a discount yields more than 6% to maturity; bought at a premium, less.

YTM solves for the internal rate that equates the bond’s price today to the present value of all future cash flows — coupons plus par at maturity. If a company issues venture debt with upfront fees, interest-only periods, and warrants, comparing headline coupon to YTM on a public bond benchmark is imperfect but directionally useful. Credit funds and lenders quote YTM when marketing holdings to LPs because it allows apples-to-apples comparison across issuers and durations.

For convertible notes, YTM on the debt component differs from the equity upside if conversion triggers — founders should model both paths, not treat the note as pure debt.

Why it matters

• Founders: When lenders quote “8% interest,” ask what all-in YTM is after fees, warrants, and amortization schedule. That number reflects true borrowing cost better than coupon alone.
• Investors: YTM helps credit and crossover investors judge whether private debt compensates for illiquidity and default risk versus public markets.

Common mistake

Equating coupon rate with economic yield. Original issue discount, prepayment penalties, and equity kickers change the effective return — YTM (or an equivalent IRR on cash flows) captures what coupon rate alone misses.

Related ideas

See also venture debt, warrants, and IRR.